Catalyst for purification of exhaust gases

Details Catalyst for purification of exhaust gases Catalyst for purification of exhaust gases

1993-03-26

1994-04-26

Dees, Carl F.

Catalyst, solid sorbent, or support therefor: product or process

Zeolite or clay, including gallium analogs

Gallium containing

502 60, 502 74, B01J 2904, B01J 2906

Patent

active

053066847

ABSTRACT:
There is described a catalyst for purification of exhaust gases containing nitrogen oxides wherein oxygen is co-existent in excess of a stoichiometric amount, characterized in that a coprecipitated mixed oxide of copper and tin is loaded on a carrier composed of at least one type selected from the group consisting of crystalline aluminosilicate, aluminogallosilicate and gallosilicate, or the coprecipitated mixed oxide of copper and tin and further at least one noble metal selected from the group consisting of platinum, palladium, rhodium, iridium, ruthenium, silver and gold are co-loaded thereon.
This invention provides a lean NOx purification catalyst having high NOx purification performance and markedly increased durability over a wide temperature range.

REFERENCES:
patent: 3976745 (1976-08-01), Nakajima et al.
patent: 5041270 (1991-08-01), Fujitani et al.
patent: 5051393 (1991-09-01), Harrison et al.
patent: 5169814 (1992-12-01), Yoshimoto et al.
patent: 5208198 (1993-05-01), Nakano et al.
patent: 5223236 (1993-06-01), Inoue et al.

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