Process for producing exhaust-gas-purifying catalyst

Details Process for producing exhaust-gas-purifying catalyst Process for producing exhaust-gas-purifying catalyst

1995-07-27

1999-02-02

Lewis, Michael

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

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

502327, 502339, B01J 2389, B01J 2340

Patent

active

058665005

ABSTRACT:
A process for producing an exhaust-gas-purifying catalyst includes the steps of immersing a porous support into a solution including a noble metal catalyst ingredient, thereby preparing a support with a noble metal catalyst ingredient loaded thereon, and thermally treating the noble-metal-catalyst-ingredient-loaded support at a temperature of 800.degree. C. or more in non-oxidizing atmosphere. In the thermally-treating step, the noble metal catalyst ingredient is prevented from being oxidized to its oxide, and accordingly it is inhibited from migrating in vapor phase. Further, in the thermally-treating step, pores of the porous support are contracted so that they surround the noble metal catalyst ingredient closely therein. All in all, the noble metal catalyst ingredient is prevented from sintering. Thus, the resulting exhaust-gas-purifying catalyst is of superb heat-resistance, and it can be applied to elevated temperatures of 800.degree. C. or more in fuel-lean atmosphere.

REFERENCES:
patent: 3993572 (1976-11-01), Hindin et al.
patent: 4165276 (1979-08-01), Antos
patent: 4284531 (1981-08-01), Simpson et al.
patent: 4581343 (1986-04-01), Blanchard et al.
patent: 5064803 (1991-11-01), Nunan
patent: 5073532 (1991-12-01), Domesle et al.
patent: 5179059 (1993-01-01), Domesle et al.

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