Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Metal – metal oxide or metal hydroxide
Patent
1992-04-30
1994-01-04
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
Patent
active
052759970
ABSTRACT:
Three-way precious metal catalysts useful for conversion treatment of pollutants in fuel combustion gases from automotive exhausts, or gas emissions from stationary fuel combustion sources, have chemical activity and thermal stability of the catalysts appreciably enhanced by utilizing a composite oxygen-ion conducting support material. Such composite supports are composed of zirconia stabilized by yttria, calcia, magnesia or scandia, and at least 40 wt. % inert support material such as alumina or titania, and have surface area of 20-300 m.sup.2 /gm. The catalysts can be supported by composites of yttria-stabilized-zirconia (YSZ) and alumina, and contain 0.01-3.0 wt % total active metals, which may consist of major metals platinum or palladium and minor metals rhodium or ruthenium dispersed on the support. Such three-way catalysts are thermally stable, achieve a high level of pollutants (CO, NO.sub.x, H.sub.2 and hydrocarbons) removal, and have long catalyst life without requiring undesirably high loading of expensive precious active metals on the catalyst support material.
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Ganguli Partha S.
Sundaresan Sankaran
McFarlane Anthony
PCP Consulting and Research, Inc.
Wilson Fred A.
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