Surface-coated zeolite materials for diesel oxidation applications
AssigneeBASF SE
InventorsXinyi Wei, Stanley A. Roth
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Abstract
A diesel oxidation catalyst for the treatment of exhaust gas emissions, such as the oxidation of unburned hydrocarbons (HC) and carbon monoxide (CO) is described. Also described is a novel washcoat composition including a surface-coated zeolite coated with at least one of zirconia and alumina, and a platinum group metal supported on a high surface area alumina.
Claims14
A catalytic article for treating an exhaust gas stream containing hydrocarbons, CO and particulate matter, the article comprising a substrate having an inlet end and an outlet end defining an axial length, the substrate coated with at least one washcoat layer formed from a washcoat composition comprising a spray-dried surface-coated zeolite surface-coated with one or more of zirconia and alumina, and a platinum group metal supported on at least one of the surface-coated zeolite and a high surface area refractory metal oxide.
Dependencies are inferred from the claim text.