Treating automotive enhaust gases with binary la/pd oxides

Details Treating automotive enhaust gases with binary la/pd oxides Treating automotive enhaust gases with binary la/pd oxides

B - Operations, Transporting

01

J

B01J 23/56 (2006.01) B01J 23/63 (2006.01) B01J 37/02 (2006.01) B01D 53/36 (1990.01)

Patent

CA 2096772

- 14 - Abstract of the Disclosure A catalyst having high temperature (800-1050°C) stability and improved three-way automotive exhaust gas catalyst activity at high temperatures, comprising an outer catalytic coating of binary La-Pd oxide (La2Pd2O5 or La4PdO7) calcined and supported on a catalyst-supporting substrate, the oxide being present in an amount to provide 15-150g of Pd per cubic foot of the substrate. A 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°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.

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