发明授权
- 专利标题: Binary LA-PA oxide catalyst and method of making the catalyst
- 专利标题(中): 二元LA-PA氧化物催化剂及其制备方法
-
申请号: US894703申请日: 1992-06-05
-
公开(公告)号: US5234881A公开(公告)日: 1993-08-10
- 发明人: Chaitanya K. Narula , William L. H. Watkins , Mohinder S. Chattha
- 申请人: Chaitanya K. Narula , William L. H. Watkins , Mohinder S. Chattha
- 申请人地址: MI Dearborn
- 专利权人: Ford Motor Company
- 当前专利权人: Ford Motor Company
- 当前专利权人地址: MI Dearborn
- 主分类号: B01D53/94
- IPC分类号: B01D53/94 ; B01J23/56 ; B01J23/63 ; B01J37/02
摘要:
A catalyst having high temperature (800.degree.-1050.degree. C.) stability and improved three-way automotive exhaust gas catalyst activity at high temperatures, comprising an outer catalytic coating of binary La-Pd oxide (La.sub.2 Pd.sub.2 O.sub.5 or La.sub.4 PdO.sub.7) calcined and supported on a catalyst-supporting substrate, the oxide being present in an amount to provide 15-150 g of Pd per cubic foot of the substrateA method of making binary La-Pd oxides useful as an automotive exhaust catalyst operative at high temperatures, comprising heating in an oxidizing atmosphere a mixture containing La compounds and Pd compounds in a La:Pd ratio of 1:1 or 4:1, the heating being staged to first heat slowly from about 50.degree. C. to start decomposition of the compounds and thereafter retaining the residue at an elevated temperature to stimulate growth of crystalline binary La-Pd oxides and to calcine the crystalline oxides.A method of making an automotive catalyst by suspending binary La-Pd oxides in a sol (preferably alumina sol) and depositing and fixing such sol suspension on a substrate coated with conventional washcoats.