An exhaust emission control catalyst having an excellent NOx converting capability includes a modified alumina which has a .theta.-phase and an .alpha.-phase and has an .alpha.-conversion rate R in a range of 0.5 %.ltoreq.R.ltoreq.95 %, and a catalytic metal carried in the modified alumina, e.g., platinum...http://www.google.es/patents/US6008155?utm_source=gb-gplus-sharePatente US6008155 - Exhaust emission control catalyst and process for producing the same
Exhaust emission control catalyst and process for producing the same
