CN100563825C - A kind of metal mesh type combustion catalyst and preparation thereof and application - Google Patents
A kind of metal mesh type combustion catalyst and preparation thereof and application Download PDFInfo
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- CN100563825C CN100563825C CNB2007100672884A CN200710067288A CN100563825C CN 100563825 C CN100563825 C CN 100563825C CN B2007100672884 A CNB2007100672884 A CN B2007100672884A CN 200710067288 A CN200710067288 A CN 200710067288A CN 100563825 C CN100563825 C CN 100563825C
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Abstract
The invention discloses a kind of metal mesh type combustion catalyst, this catalyst is to be coated with the Al of electrophoretic deposition formation and the Al that roasting forms on the woven wire
2O
3Adhesive layer is stained with active component on the described adhesive layer, and described active component is shown in general formula: La
xSr
1-xCo
yMn
1-yO
3Described Preparation of catalysts method comprises following three steps: (1) coats Al on woven wire
2O
3/ Al adhesive layer; (2) preparation of active component; (3) active constituent loading is coated with Al to the surface
2O
3On the wire mesh carrier of/Al adhesive layer.This metal mesh type combustion catalyst has the characteristics of high activity, high-mechanical property, high thermal stability, can be applicable to catalytic combustion eliminates in industrial volatile organic exhaust gas (VOCs) pollution, have good social benefit and economic benefit, and have favorable industrial application prospect.
Description
(1) technical field
The present invention relates to a kind of metal mesh type combustion catalyst and preparation thereof and catalytic combustion and use, be specially adapted to catalytic combustion and eliminate effumability organic exhaust gas (VOCs).
(2) background technology
The effumability organic exhaust gas (VOCs) that produces in technologies such as enamel-covered wire, rubber, synthetic leather, pharmacy, coating processing is the main atmosphere pollution of a class, as benzene,toluene,xylene, acetone, pyridine, ethyl acetate etc., they bring great harm to human health, and catalytic combustion technology is to handle one of effective method of VOCs.
Ceramic honeycomb catalyst [Chinese patent CN 97120101.3, CN 02125000.6] be the traditional catalyst that industrial catalytic combustion is handled VOCs, it is low that the honeycomb ceramic type catalyst has the air-flow pressure drop, clean-up effect is more stable, be convenient to handle the characteristic of big flux organic exhaust gas, but because the thermal conductivity of ceramic material own is bad, a large amount of heats that catalytic combustion is emitted can cause catalyst surface high temperature, when catalyst under long term high temperature and adverse circumstances during operation, surface active composition is easy to sintering and inactivation has a strong impact on catalyst life; Secondly because separate between the ceramic honey comb material duct, air-flow can only flow in single duct, and radially convection current can't take place, thereby the mass-transfer efficiency that has limited it makes the catalytic combustion decrease in efficiency.Also have the ceramic honeycomb material catalyst to recycle, significant wastage resource.And, have the characteristic of high thermoconductivity, high stability and strong mechanical performance by the integrated member type cellular material that the stainless steel metal silk screen is assembled into.It can transfer to periphery to the heat that catalytic combustion produces rapidly, and beds hot localised points can not occur, thereby has guaranteed that catalyst moves stably, has prolonged its service life; And honeycomb type stainless steel wire net materials has three-D space structure, and air-flow can shuttle back and forth mobile in a plurality of ducts, and whole liquid form is very complicated, it is higher to compare ceramic honey comb material mass transfer rate, what is more important woven wire material can reuse, and has reduced cost, has saved resource.Therefore the metal mesh type material is comparatively suitable catalyst for catalytic combustion carrier.
Metal current member type catalyst has had some application reports, as United States Patent (USP) [US5026273, US 4195063, US6508056] adopt the woven wire supported precious metal catalyst to be applied in the vehicle exhaust processing, Chung J S[Catalysis Today, 2004,97:159-165], Ahlstrom-Silversand A F[Applied Catalysis A:General, 1997,153:177-201] etc. the people with noble metal such as Pt, Pd etc. are coated on and are applied to catalytic combustion on the woven wire, all obtained effect preferably, they have studied some response characteristics of catalytic combustion on the wire mesh catalyst simultaneously, have proved that woven wire has higher mass-and heat-transfer coefficient and better heat endurance than ceramic honey comb.
In the VOCs catalytic combustion was handled, noble metal (as Pt, Pd, Ru etc.) had obtained using widely in elimination VOCs pollution owing to have good low temperature active.But the noble metal catalyst existence costs an arm and a leg, and heat resistanceheat resistant stability is low, shortcomings such as easy poisoning and deactivation, and application cost is quite high.Have high thermal stability, highly active nano perovskite type rare-earth composite oxides ABO in recent years
3The appearance of [Labhsetwar N K, Appplied Catalysis B:Enviromental, 2001,33 (2): 165-173] provides an approach for we seek a kind of more cheap catalyst.After being replaced by other metallic element isomorphous, the A element in the perovskite structure (replaces partial L a) as Sr, can make the interior mutually lattice defect that forms of perovskite body, and the defective bit existence has significantly improved the catalytic combustion activity of perovskite, becomes possibility thereby make perovskite catalyst substitute noble metal catalyst.
Under this prerequisite, if can study a kind of novel catalyst, it not only has bulk metal honeycomb screen net structure, and the catalyst activity species are cheap and highly active composite oxides, and this handles big flux VOCs for Production by Catalytic Combustion Process and provides a shortcut further reducing processing cost, raising catalyst mithridatism, hear resistance and mechanical performance.
(3) summary of the invention
Problem to be solved by this invention just provides the metal mesh type combustion catalyst of a kind of high activity, high-mechanical property, high thermal stability, and its production and application, be applied in catalytic combustion and eliminate in the VOCs pollution.
The technical solution used in the present invention is as follows:
A kind of metal mesh type combustion catalyst, described catalyst are to be coated with the Al of electrophoretic deposition formation and the Al that roasting forms on the woven wire
2O
3Be stained with active component on adhesive layer, the described adhesive layer; Described active component is shown in general formula:
La
1-xSr
xCo
yMn
1-yO
3
Wherein La, Sr, Co, Mn represent lanthanum, strontium, cobalt, manganese respectively, x=0～0.7, and y=0～0.7, described activity component load quantity is 2～5wt%.If x=0 in the described active component, active component is LaCo
yMn
1-yO
3If, y=0, active component is La
1-xSr
xMnO
3If x and y are 0, then active component is LaMnO
3, such active component is applicable to the present invention too.
The material of described woven wire is one of following: stainless steel 316, stainless steel 316L, stainless steel 314, stainless steel 314L, nichrome, nimonic, chromium aluminium molybdenum alloy.
The specification of described woven wire is 10 orders, 20 orders, 50 orders.
The preparation method of above-mentioned metal mesh type combustion catalyst, carry out as follows:
(1) on woven wire, coats Al
2O
3/ Al adhesive layer: with the absolute ethyl alcohol is dispersate, and the aluminium powder of particle diameter 1～5 μ m is the electrophoretic deposition thing, adds triethylamine (TEA) and polypropylene acid (PAA) in the dispersate as additive, prepares suspension; With the woven wire of identical size as negative electrode and anode, the aluminium powder layer of electrophoretic deposition one deck even compact on the anode metal silk screen; Again under inert gas shielding in 600～850 ℃ of roastings, 400～600 ℃ of roastings in air atmosphere then promptly form described Al on woven wire surface
2O
3/ Al adhesive layer;
(2) preparation of active component: get lanthanum, strontium, cobalt, manganese atom than=(1-x): x: y: nitrate (1-y) adds deionized water and is made into lanthanum, strontium, cobalt, manganese nitrate solution, and total cation concentration is 0.05～0.1mol/L; Splash into NaOH and sodium carbonate mixed alkali liquor and carry out co-precipitation, the concentration of described mixed ammonium/alkali solutions is 5～10wt%, and the control final pH is 9～11, filtration obtains precipitation, uses deionized water, absolute ethanol washing successively, drying, 500～700 ℃ of roastings, make La
1-xSrxCo
yMn
1-yO
3The perovskite powder; Get mass ratio and be 1～2: 1 La
1-xSr
xCo
yMn
1-yO
3Powder and γ-Al
2O
3, add surfactant ethylene glycol again, regulating pH is 5～6, puts into the ball mill ball milling, is made into the coating slurries with deionized water again, La in the described coating slurries
1-xSr
xCo
yMn
1-yO
3Powder and γ-Al
2O
3Active component content is 10～20wt%, described ethylene glycol content be 1～5wt%;
(3) active constituent loading is coated with Al to the surface
2O
3On the wire mesh carrier of/Al adhesive layer: the surface is coated with Al
2O
3The wire mesh carrier of/Al adhesive layer was put into coating liquid 2～5 minutes, pulled out fast, blew mesh open, and drying at room temperature 450～550 ℃ of roastings, repeats aforesaid operations to surface catalyst layer and reaches certain thickness, promptly obtains described metal mesh type catalyst.
Further, the additive triethylamine consumption described in the above-mentioned steps (1) is 1.0～8.0 * 10
-3M, described polypropylene acid consumption is 0.001～0.01wt%; Triethylamine concentration is preferably 6.0 * 10
-3M, the acrylic acid consumption is preferably 0.0015wt%.
Further again, lanthanum, strontium, cobalt, manganese nitrate solution total cation concentration are preferably 0.05～0.07mol/L in the above-mentioned steps (2), more preferably 0.05mol/L.
NaOH described in the above-mentioned steps (2) and sodium carbonate mixed alkali liquor, sodium carbonate and NaOH amount of substance ratio are 1: 1～2.
La described in the above-mentioned steps (2)
1-xSr
xCo
yMn
1-yO
3Powder and γ-Al
2O
3Active component content in applying slurries is preferably 13～17wt%, more preferably 15wt%.。
Electrophoretic deposition described in the above-mentioned steps (1) be woven wire with identical size as two-sided negative electrode, place between two negative electrode silk screens as anode with the woven wire of an identical size is equidistant again, negative electrode and anode distance are 1～4cm; Described electrophoretic deposition uses voltage-stabilized power supply, and its pressuring method is pressurization stage by stage.
Particularly, the present invention recommends the preparation method of metal mesh type combustion catalyst, carries out as follows:
(1) on woven wire, coats Al
2O
3/ Al adhesive layer: with woven wire (316L, 20 orders) be cut into the woven wire of two identical sizes of about 4 * 8cm, respectively as negative electrode and anode, with the absolute ethyl alcohol is dispersate, the aluminium powder of particle diameter 1～5 μ m is the electrophoretic deposition thing, add triethylamine (TEA) and polypropylene acid (PAA) in the dispersate as additive, prepare suspension, described triethylamine consumption is 6.0 * 10
-3M, described polypropylene acid consumption is 0.0012wt%; Connect the aluminium powder layer of voltage-stabilized power supply electrophoretic deposition one deck even compact on the anode metal silk screen; Again under inert gas shielding in 600～850 ℃ of roastings 2.5～3.5 hours, 400～600 ℃ of roastings 4～6 hours in air atmosphere then promptly form described Al on the woven wire surface
2O
3/ Al adhesive layer; The voltage pressuring method is that 50V, 100V, 150V, 220V respectively stop 3min.
(2) preparation of active component: getting lanthanum nitrate, strontium nitrate, cobalt nitrate, manganese nitrate is (1-x): x: y by atomic ratio: (1-y) add deionized water and be made into the mixed liquor that total cation concentration is 0.05～0.07mol/L, be that 1: 1 NaOH and sodium carbonate mixed alkali liquor splash into and carry out co-precipitation with proportioning again, the concentration of described mixed ammonium/alkali solutions is 5～10wt%, the control final pH is 9～11, filtration obtains precipitation, suction filtration behind the ageing 2h, filter cake is used deionized water, absolute ethanol washing successively, 80 ℃ of dryings, 500～700 ℃ of roastings 2 hours, make La
1-xSr
xCo
yMn
1-yO
3The perovskite powder; Get mass ratio and be 1: 1 La
1-xSr
xCo
yMn
1-yO
3Powder and γ-Al
2O
3, add surfactant ethylene glycol again, regulating pH is 5～6, puts into the ball mill ball milling, is made into the coating slurries with deionized water again, La in the described coating slurries
1-xSr
xCo
yMn
1-yO
3Powder and γ-Al
2O
3The content of active component is 13～17wt%, described ethylene glycol content be 1～5wt%;
(3) active constituent loading is coated with Al to the surface
2O
3On the wire mesh carrier of/Al adhesive layer: the surface is coated with Al
2O
3The wire mesh carrier of/Al adhesive layer was put into coating liquid 2～5 minutes, pulled out fast, blew mesh open, drying at room temperature, 450～550 ℃ of roastings 4 hours, repeat aforesaid operations to surface catalyst layer and reach certain thickness, promptly obtain described metal mesh type catalyst.
Metal mesh type combustion catalyst of the present invention can be applicable to catalytic combustion and eliminates in industrial volatile organic exhaust gas (VOCs) pollution.Described volatile organic exhaust gas comprises: toluene, dimethylbenzene, chlorobenzene, pyridine, acetone, butanone, acetate, ethyl acetate.
The catalytic combustion activity test of described catalyst is carried out on the gas-solid reaction device: get described catalyst, it closely is curled into the cylindrical integral material, place reaction tube, the unstripped gas air divides two-way, one road air enters organic gas generator (ice bath), converge with another road air then and enter reactor, described catalytic combustion temperature is 20～400 ℃, and air speed is 10～400,000 ml/h (g cat)
-1
Particularly, the catalytic combustion activity test is carried out on the gas-solid reaction device.Getting catalyst quality is 5g, La
0.8Sr
0.2MnO
3Load capacity be 2%, with closely curling 5 circles of every silk screen catalyst, gap between layer and the layer is 1mm, being rolled into diameter is 8.5mm, height is the cylinder of 30mm, the catalyst bed layer height is 90mm, be placed on stainless steel reaction pipe middle part isothermal region, the unstripped gas air divides two-way to control (D07-11A/ZM) with mass flowmenter, one road air enters organic gas generator (ice bath), converge with another road air then and enter reactor, regulate the flow of two-way air and can control inlet gas concentration and air speed.
The present invention compared with prior art, its beneficial effect is embodied in: (1) metal mesh type combustion catalyst can reuse, beds when (2) having overcome catalyst combustion reaction " focus " causes the problem of catalysqt deactivation sintering, (3) metal mesh type combustion catalyst mechanical strength provided by the invention height.Therefore metal mesh type is replaced the ceramic honey comb cellular material has good social benefit and economic benefit as catalyst for catalytic combustion, and has favorable industrial application prospect.
(4) description of drawings:
Accompanying drawing 1: stainless steel wire net surface SEM figure;
Accompanying drawing 2: press embodiment 1 preparation-obtained surface-coated Al
2O
3The woven wire SEM figure of/Al carrier film;
Accompanying drawing 3: press the prepared La of embodiment 1
1-xSr
xCo
yMn
1-yO
3Perovskite powder X-ray RD figure;
Accompanying drawing 4: the metal mesh type combustion catalyst XRD figure of pressing the prepared area load active specy of embodiment 1.
(5) specific embodiment
Below with instantiation technical scheme of the present invention is described, but protection scope of the present invention is not limited thereto:
Embodiment 1
Stainless steel cloth (316L, 20 orders) is cut into 4 * 8cm, its surface as shown in Figure 1, adopt electrophoretic deposition technique with the aluminum particle uniform deposition in the stainless steel wire net surface, the triethylamine consumption is 6.0 * 10
-3M, polyacrylic acid 0.0012wt%, voltage pressuring method are that 50V, 100V, 150V, 220V respectively stop 3min.The following 800 ℃ of sintering 3h of argon shield, 500 ℃ of roasting 5h in the air atmosphere prepare stainless steel cloth surfaces A l then
2O
3/ Al carrier film, its surface scan Electronic Speculum figure as shown in Figure 2.
Co-precipitation legal system nano perovskite type rare-earth composite oxide particle.Adopting proportioning is that 1: 1 NaOH and sodium carbonate mixed base are as coprecipitator, is 0.8: 0.2: 0.3 with lanthanum nitrate, strontium nitrate, cobalt nitrate, manganese nitrate by atomic ratio: 0.7 is made into the mixed liquor that total ion concentration is 0.05mol/L, carry out co-precipitation, control terminal point pH is about 10, suction filtration behind the ageing 2h is with the absolute ethyl alcohol replacing water, after 80 ℃ of dryings, place 700 ℃ of roasting 2h of Muffle furnace, prepare nano perovskite type rare-earth composite oxides La
0.8Sr
0.2Co
0.3Mn
0.7O
3
Get the nano perovskite type rare-earth composite oxide particle La that 5g prepares
0.8Sr
0.2Co
0.3Mn
0.7O
3With 5g γ-Al
2O3 adds the 45ml ionized water, adds 5ml surfactant ethylene glycol, and regulating pH with red fuming nitric acid (RFNA) is 6, and ball milling 2h prepares the active component coating liquid.
The surface had Al
2O
3The stainless steel cloth of/Al carrier film impregnated in 2min in the active component coating liquid, pulls out fast, blows mesh open, after the drying at room temperature, and 500 ℃ of roasting 3h.Repeat aforesaid operations repeatedly, reach the catalyst loadings of 2wt%.Accompanying drawing 4 is for having applied the stainless steel cloth of active component coating.
Embodiment 2
Method according to example 1 prepares metal mesh type combustion catalyst La
0.8Sr
0.2Co
0.3Mn
0.7O
3Load capacity is the wire mesh catalyst of 2wt%, and different is that the stainless steel cloth material of choosing is 316 stainless steels.
Embodiment 3
Method according to example 1 prepares metal mesh type combustion catalyst La
0.8Sr
0.2Co
0.3Mn
0.7O
3Load capacity is the wire mesh catalyst of 2wt%, and different is that the stainless steel cloth material of choosing is 314 stainless steels.
Embodiment 4
Method according to example 1 prepares metal mesh type combustion catalyst La
0.8Sr
0.2Co
0.3Mn
0.7O
3Load capacity is the wire mesh catalyst of 2wt%, and different is that the stainless steel cloth material of choosing is the 314L stainless steel.
Embodiment 5
Method according to example 1 prepares metal mesh type combustion catalyst, and different is that the woven wire material of choosing is a nichrome.
Embodiment 6
Method according to example 1 prepares metal mesh type combustion catalyst, and different is that the woven wire material of choosing is a nimonic.
Embodiment 7
Method according to example 1 prepares metal mesh type combustion catalyst, and different is that the woven wire material of choosing is a chromium aluminium molybdenum alloy.
Embodiment 8
Method according to example 1 prepares metal mesh type combustion catalyst, and different is, additive amount difference during electrophoretic deposition, and triethylamine is 8.0 * 10
-3M, polyacrylic acid are 0.003wt%, final Al
2O
3The load capacity of/Al adhesive layer is 7wt%.
Embodiment 9
Method according to example 1 prepares metal mesh type combustion catalyst; different is the heat treatment mode difference, the stainless steel cloth that electrophoretic deposition is good, and argon shield stops 2h at 500 ℃ earlier down; be warming up to 830 ℃ and stop 4h, be cooled to again and stop 6h under 550 ℃ of air atmospheres.
Method according to example 1 prepares metal mesh type combustion catalyst, and different is in the perovskite-type rare-earth composite oxides, and the atomic ratio of La, Sr, Co, Mn is 0.7: 0.3: 03: 0.7.
Embodiment 11
Method according to example 1 prepares metal mesh type combustion catalyst, and different is, in the perovskite-type rare-earth composite oxides, does not add cobalt element in the step (2), and the atomic ratio of La, Sr, Mn is 0.7: 0.3: 1.
Embodiment 12
Method according to example 1 prepares metal mesh type combustion catalyst, and different is, in the perovskite-type rare-earth composite oxides, does not add strontium element in the step (2), and the atomic ratio of La, Co, Mn is 1: 0.3: 0.7.
Embodiment 13
Method according to example 1 prepares metal mesh type combustion catalyst, and different is, in the perovskite-type rare-earth composite oxides, does not add cobalt, strontium element in the step (2), and the atomic ratio of La, Mn is 1: 1.
Embodiment 14
On self-control gas-solid reaction device, carry out reaction tube pipe range 350mm, internal diameter 9mm by the example 1 made metal mesh type combustion catalyst active testing of getting ready.The heating furnace isothermal region is about and is 120mm, upper and lower temperature difference＜3 ℃.Getting catalyst quality is 5g, La
0.8Sr
0.2MnO
3Load capacity be 2%, with closely curling 5 circles of every silk screen catalyst, gap between layer and the layer is 1mm, being rolled into diameter is 8.5mm, height is the cylinder of 30mm, the catalyst bed layer height is 90mm, be placed on stainless steel reaction pipe middle part isothermal region, the unstripped gas air divides two-way to control (D07-11A/ZM) with mass flowmenter, one road air enters organic gas generator (ice bath), converge with another road air then and enter reactor, regulate the flow of two-way air and can control inlet gas concentration and air speed.Reaction end gas adopts the on-line analysis of Agilent 6890N chromatogram pneumatic operated valve auto injection, and chromatographic column is a packed column, is carrier with diatomite, and fixer is DNP, the TCD detector.Blank assay shows that the blank pipe toluene conversion is less than 3% in the time of 450 ℃.Be applied to the catalytic combustion of toluene (0.5vol.%), dimethylbenzene (0.23vol.%), acetone (2vol.%), described catalytic combustion temperature is 200～450 ℃, air speed GHSV=100000～400000mlh
-1(g
Cat)
-150% ignition temperature and the completing combustion temperature of gained see Table 1:
50% of three kinds of effumability organic exhaust gas of table 1 transform and the completing combustion temperature
As can be seen, the nano perovskite type rare-earth composite oxides are coated on stainless steel wire still extraordinary catalytic combustion activity on the net, is 400000mlh in air speed
-1(g
Cat)
-1Three kinds of effumability organic exhaust gas all can be by completing combustion under 390 ℃.
Embodiment 15
Embodiment 5, embodiment 8, embodiment 10, embodiment 11, embodiment 12, embodiment 13 prepared catalyst (air speed GHSV=20 ten thousand ml/g (cat) h) under embodiment 14 described reactors and reaction condition are carried out the toluene catalytically combustion testing, and test result is as follows:
Table 2 different catalysts toluene completing combustion temperature measuring
Embodiment 16
Press example 14 described reaction units, the metal mesh type combustion catalyst that embodiment 1 is prepared closely is curled into cylinder bodily form integral material, places reaction tube, reaction temperature is promoted to 800 ℃, constant 120h slowly is cooled to uniform temperature again, is 100000mlh to total air speed
-1(g
Cat)
-1, concentration is that the toluene of 0.5vol.% carries out the catalytic combustion test, still can reach 100% 340 ℃ of toluene conversion.
Claims (10)
1. a metal mesh type combustion catalyst is characterized in that described catalyst is to be coated with the Al of electrophoretic deposition formation and the Al that roasting forms on the woven wire
2O
3Adhesive layer, the Al that Al that electrophoretic deposition forms and roasting form
2O
3Adhesive layer is designated as Al
2O
3/ Al adhesive layer, described Al
2O
3Be stained with active component on the/Al adhesive layer; Described active component is shown in general formula:
La
1-xSr
xCo
yMn
1-yO
3
Wherein La, Sr, Co, Mn represent lanthanum, strontium, cobalt, manganese respectively, x=0～0.7, and y=0～0.7, described activity component load quantity is 2～5wt%;
Described catalyst is prepared as follows:
(1) on woven wire, coats Al
2O
3/ Al adhesive layer: with the absolute ethyl alcohol is dispersate, and the aluminium powder of particle diameter 1～5 μ m is the electrophoretic deposition thing, adds triethylamine and polyacrylic acid in the dispersate as additive, prepares suspension; With the woven wire of identical size as negative electrode and anode, the aluminium powder layer of electrophoretic deposition one deck even compact on the anode metal silk screen; Again under inert gas shielding in 600～850 ℃ of roastings, 400～600 ℃ of roastings in air atmosphere then promptly form described Al on woven wire surface
2O
3/ Al adhesive layer;
(2) preparation of active component: get lanthanum, strontium, cobalt, manganese atom than=(1-x): x: y: nitrate (1-y) adds deionized water and is made into lanthanum, strontium, cobalt, manganese nitrate solution, x=0～0.7 wherein, y=0～0.7, total cation concentration are 0.05～0.1mol/L; In lanthanum, strontium, cobalt, manganese nitrate solution, splash into NaOH again and the sodium carbonate mixed alkali liquor carries out co-precipitation, the concentration of described mixed alkali liquor is 5～10wt%, the control final pH is 9～11, filtration obtains precipitation, use deionized water, absolute ethanol washing successively, drying, filter cake makes La 500～700 ℃ of roastings
1-xSr
xCo
yMn
1-yO
3The perovskite powder; Get mass ratio and be 1～2: 1 La
1-xSr
xCo
yMn
1-yO
3Perovskite powder and γ-Al
2O
3, add surfactant ethylene glycol again, regulating pH is 5～6, puts into the ball mill ball milling, is made into the coating slurries with deionized water again, La in the described coating slurries
1-xSr
xCo
yMn
1-yO
3Perovskite powder and γ-Al
2O
3Content be 10～20wt%, described glycol content is 1～5wt%;
(3) active constituent loading is coated with Al to the surface
2O
3On the wire mesh carrier of/Al adhesive layer: the surface is coated with Al
2O
3The wire mesh carrier of/Al adhesive layer is put into and was applied slurries 2～5 minutes, pulls out fast, blows mesh open, drying at room temperature, 450～550 ℃ of roastings, repeat aforesaid operations to surface catalyst layer and reach certain thickness, promptly obtain described metal mesh type combustion catalyst.
2. metal mesh type combustion catalyst as claimed in claim 1, the material that it is characterized in that described woven wire are one of following: stainless steel 316, stainless steel 316L, stainless steel 314, stainless steel 314L, nichrome, nimonic, chromium aluminium molybdenum alloy.
3. method for preparing metal mesh type combustion catalyst as claimed in claim 1 is characterized in that described method carries out as follows:
(1) on woven wire, coats Al
2O
3/ Al adhesive layer: with the absolute ethyl alcohol is dispersate, and the aluminium powder of particle diameter 1～5 μ m is the electrophoretic deposition thing, adds triethylamine and polyacrylic acid in the dispersate as additive, prepares suspension; With the woven wire of identical size as negative electrode and anode, the aluminium powder layer of electrophoretic deposition one deck even compact on the anode metal silk screen; Again under inert gas shielding in 600～850 ℃ of roastings, 400～600 ℃ of roastings in air atmosphere then promptly form described Al on woven wire surface
2O
3/ Al adhesive layer;
(2) preparation of active component: get lanthanum, strontium, cobalt, manganese atom than=(1-x): x: y: nitrate (1-y) adds deionized water and is made into lanthanum, strontium, cobalt, manganese nitrate solution, x=0～0.7 wherein, y=0～0.7, total cation concentration are 0.05～0.1mol/L; In lanthanum, strontium, cobalt, manganese nitrate solution, splash into NaOH again and the sodium carbonate mixed alkali liquor carries out co-precipitation, the concentration of described mixed alkali liquor is 5～10wt%, the control final pH is 9～11, filtration obtains precipitation, use deionized water, absolute ethanol washing successively, drying, filter cake makes La 500～700 ℃ of roastings
1-xSr
xCo
yMn
1-yO
3The perovskite powder; Get mass ratio and be 1～2: 1 La
1-xSr
xCo
yMn
1-yO
3Perovskite powder and γ-Al
2O
3, add surfactant ethylene glycol again, regulating pH is 5～6, puts into the ball mill ball milling, is made into the coating slurries with deionized water again, La in the described coating slurries
1-xSr
xCo
yMn
1-yO
3Perovskite powder and γ-Al
2O
3Content be 10～20wt%, described glycol content is 1～5wt%;
(3) active constituent loading is coated with Al to the surface
2O
3On the wire mesh carrier of/Al adhesive layer: the surface is coated with Al
2O
3The wire mesh carrier of/Al adhesive layer is put into and was applied slurries 2～5 minutes, pulls out fast, blows mesh open, drying at room temperature, 450～550 ℃ of roastings, repeat aforesaid operations to surface catalyst layer and reach certain thickness, promptly obtain described metal mesh type combustion catalyst.
4. the preparation method of metal mesh type combustion catalyst as claimed in claim 3 is characterized in that the triethylamine consumption is 1.0～8.0 * 10 in the middle additive of step (1)
-3Mol/L, polyacrylic acid consumption are 0.001～0.01wt%.
5. the preparation method of metal mesh type combustion catalyst as claimed in claim 3 is characterized in that lanthanum, strontium, cobalt, manganese nitrate solution total cation concentration are 0.05～0.07mol/L in the step (2).
6. the preparation method of metal mesh type combustion catalyst as claimed in claim 3 is characterized in that sodium carbonate and NaOH amount of substance ratio are 1: 1～2 in NaOH described in the step (2) and the sodium carbonate mixed alkali liquor.
7. the preparation method of metal mesh type combustion catalyst as claimed in claim 3 is characterized in that La in the coating slurries described in the described step (2)
1-xSr
xCo
yMn
1-yO
3Perovskite powder and γ-Al
2O
3Content be 13～17wt%.
8. the preparation method of metal mesh type combustion catalyst as claimed in claim 3, it is characterized in that the electrophoretic deposition described in the described step (1) is that woven wire with identical size is as two negative electrode silk screens, place between two negative electrode silk screens as anode with the woven wire of an identical size is equidistant, negative electrode and anode distance are 1～4cm again; Described electrophoretic deposition uses voltage-stabilized power supply, and its pressuring method is pressurization stage by stage.
9. metal mesh type combustion catalyst as claimed in claim 1 or 2 is eliminated application in the industrial volatile Organic Waste Gas Pollution at catalytic combustion, and described waste gas is toluene, dimethylbenzene or acetone.
10. metal mesh type combustion catalyst as claimed in claim 9 is eliminated application in the industrial volatile Organic Waste Gas Pollution at catalytic combustion, it is characterized in that catalytic combustion activity test carries out on the gas-solid reaction device: get described catalyst, it closely is curled into the cylindrical integral material, place reaction tube, the unstripped gas air divides two-way, one road air enters the organic gas generator under the condition of ice bath, converge with another road air then and enter reactor, described catalytic combustion temperature is 200～400 ℃, and air speed is 10～400,000 mlh
-1(g cat)
-1
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| CN103244958A (en) * | 2012-02-02 | 2013-08-14 | 中国科学院过程工程研究所 | Pulsation wire mesh catalytic burning device and method |
| CN102794169B (en) * | 2012-08-30 | 2014-04-30 | 合肥工业大学 | Attapulgite-perovskite composite material, preparation method and application thereof |
| CN105498789B (en) * | 2015-12-14 | 2018-04-17 | 南京工业大学 | A kind of flexible fibreglass base catalyst for VOCs catalysis burnings and its preparation method and application |
| CN107335416A (en) * | 2017-06-08 | 2017-11-10 | 浙江工业大学 | A kind of catalyst nanoparticles dispersion liquid and preparation method and application |
| CN109351182A (en) * | 2018-11-27 | 2019-02-19 | 蓝天环保设备工程股份有限公司 | A kind of Sinter-plate Filter with VOCs remove |
| CN114832622B (en) * | 2022-04-15 | 2023-06-20 | 华东理工大学 | High-pressure hydrogen cylinder protective casing based on hydrogen elimination function of silk screen reactor |
| CN115582125B (en) * | 2022-10-09 | 2023-08-22 | 常州大学 | Composite material for catalyzing advanced oxidation of ozone, preparation method and application |
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