In Situ Redispersion of Platinum Autoexhaust Catalysts:An On-Line Approach to Increasing Catalyst Lifetimes?

摘要

Supported precious metals,such as platinum(Pt),rhodium(Rh),and palladium(Pd),are used to facilitate many industrial catalytic processes.Pt in particular is found at the core of catalysts used throughout the petrochemical industry,from bifunctional catalysts(isomerization/dehydrogenation)used for refining of hydrocarbon fuel stocks,to three-way(CO and hydrocarbon oxidation/NO_x reduction)conversions within car exhausts.In this latter,ubiquitous application-commercialized in the USA and Japan in 1977-Pt has always been a pivotal component in the abatement of harmful gas emissions from gasoline-or diesel-driven engines.