Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Metal – metal oxide or metal hydroxide
Patent
1990-01-02
1993-08-03
McFarlane, Anthony
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Metal, metal oxide or metal hydroxide
502332, 502333, 502334, 502335, 502439, B01J 2342, B01J 2344, B01J 2106
Patent
active
052328902
ABSTRACT:
Three-way catalysts used for treatment of automobile exhaust gas or gas emissions from stationary combustion sources, which typically have consisted of platinum and rhodium and sometimes palladium and rhodium dispersed on an .gamma.-alumina support, can have the activities of the active metals in the catalysts appreciably enhanced by using an oxygen-ion conducting material such as yttria-stabilized-zirconia (YSZ) as the support material. Support material surface area is 20-300 m.sup.2 /gm, and useful concentrations of yttria on zirconia support are 1.0-50 wt. %. Useful concentrations of platinum or palladium on the support material is 0.01-2 wt. %, and the weight ratio of rhodium/platinum or rhodium/palladium is 0.01-0.1. YSZ-supported catalysts can achieve a substantially higher level of pollutants (CO, NO.sub.X, H.sub.2 and hydrocarbons) removal, without requiring increased loading of expensive precious active metals on the support material.
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Ganguli Partha S.
Sundaresan Sankaran
McFarlane Anthony
Wilson Fred A.
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