Catalyst for purifying automotive exhaust gases

Details Catalyst for purifying automotive exhaust gases Catalyst for purifying automotive exhaust gases

1974-06-28

1976-08-03

Shine, W. J.

Compositions

X-ray or neutron shield

4232135, B01J 2358

Patent

active

039728374

ABSTRACT:
This invention relates to catalyst for use in the control of atmospheric pollution and, in particular, to the purification of exhaust gases from internal combustion engines. Specific catalysts of the present invention comprise:
A. ruthenium or an alloy thereof and a metal oxide capable of forming a stable mixed oxide (or "ruthenite") with ruthenium dioxide;
B. a compound formed by ruthenium dioxide and a metal oxide capable of forming a stable mixed oxide (or ruthenite) with ruthenium dioxide; and
C. a mixed oxide containing ruthenium, the oxide being selected from the group consisting of oxides of the pyrochlore type A.sub.2 B.sub.2 O.sub.7, the perovskite type ABO.sub.3, the ilmenite type B.sub.2 O.sub.3 and the spinel type AB.sub.2 O.sub.4.
Particularly good results have been obtained where the platinum/ruthenium ratio is within the range 25- 95 wt.% platinum and 5 - 75 wt.% ruthenium.

REFERENCES:
patent: 2071119 (1937-02-01), Harger
patent: 3370914 (1968-02-01), Gross et al.
patent: 3741725 (1973-06-01), Graham
patent: 3784675 (1974-01-01), Kobylinski et al.
patent: 3809743 (1974-05-01), Unland et al.
patent: 3819536 (1974-06-01), Betta et al.
patent: 3835069 (1974-09-01), Gandhi et al.

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