Alloy catalyst and process for producing the same

Details Alloy catalyst and process for producing the same Alloy catalyst and process for producing the same

1998-07-14

2000-11-14

Dunn, Tom

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

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

502243, 502326, 502330, 502333, 502334, 502347, 502348, 4232135, 423219, 4232391, B01J 2300

Patent

active

061470279

ABSTRACT:
The present invention relates to an alloy catalyst for purifying an exhaust gas, and particularly provides an alloy catalyst excellent in nitrogen oxide purification characteristics in the lean region by improving the catalytic activity by coating first catalytic metal particles with a second metal coagulated phase, and a process for producing the same, the alloy catalyst for purifying an exhaust gas having a structure in which metal coagulated phases being applied to and supported by a metal oxide, and comprising first catalytic metal particles having an average particle size of up to 30 nm, and a second metal coagulated phase containing at least one metal, differing from the catalytic metal particles, and applying to the first catalytic metal particles at a coating ratio of at least 45%, and the process for producing an alloy catalyst for purifying an exhaust gas, comprising the steps of allowing first catalytic metal particles having an average particle size of up to 30 nm to adhere onto a metal oxide, and reduction precipitating a second metal coagulated phase containing at least one metal differing from the first catalytic metal particles thereon, and comprising at least one metal selected from the group consisting of Pt, Pd, Au, Rh, Ag and Ir.

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