Catalyst for reducing oxides of nitrogen in the exhaust gas from

Details Catalyst for reducing oxides of nitrogen in the exhaust gas from Catalyst for reducing oxides of nitrogen in the exhaust gas from

1975-04-16

1977-05-03

Shine, W. J.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

252467, 252470, 252472, 252474, 252476, 252477R, 4232132, 4232135, B01J 2104, B01J 2372, B01J 2326, B01J 2374

Patent

active

040213722

ABSTRACT:
The catalyst comprises a catalytic surface of one or more metallic oxides formed on a substantially rigid, reticulated support or substrate of a tough, strong metal or metal alloy having a melting point in excess of about 2,000.degree. F. The oxides are those of one or more members selected from the group consisting of copper, nickel, iron and chromium.
The catalyst is prepared by the method comprising the steps of: (a) plating the surface of the support or substrate with one or more layers of one or more of the members to form a plated support or substrate, (b) heating in an inert atmosphere the plated support or substrate so that the atoms on the surfaces of the members interdiffuse with themselves and with surface atoms of the support or substrate, and (c) exposing the plated support or substrate to oxidizing conditions to oxidize, at least in part, the atoms at or near the surface of the plated support or substrate to form thereat oxides of the members.

REFERENCES:
patent: 2502855 (1950-04-01), Kingston
patent: 3544264 (1970-12-01), Hardison
patent: 3565574 (1971-02-01), Kearby et al.
patent: 3634147 (1972-01-01), Helwig et al.
patent: 3718733 (1973-02-01), Gehri

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