Diesel exhaust catalyst
AssigneeW. R. Grace & Co.
InventorsMichael V. Ernest, William A. Welsh
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Abstract
A catalyst which is particularly useful in the treatment of diesel exhaust emissions is described. The catalyst comprises a mixture of a supported noble metal and/or chromium component and a bulk first transition series, silver, and/or hafnium component. The supported component catalyzes hydrocarbon conversions and the bulk component catalyzes combustion of carbon particulates in diesel exhaust gases.
Claims24
A composition comprising a mixture of catalytically-effective amounts of a supported material comprising a noble metal and chromium or catalytically-active compounds thereof, said material supported on a porous refractory inorganic oxide, and at least one bulk material selected from the group consisting of an element of the first transition series, silver, hafnium, and catalytically-active compounds thereof, said mixture deposited on a substrate.
A diesel exhaust catalyst comprising a mixture of from about 40 to 60 weight percent of a supported material comprising a platinum group metal and chromium oxide, supported on a transitional alumina and from about 40 to 60 weight percent of a bulk material comprising copper oxide, said mixture deposited on a substrate comprising a ceramic monolith, a ceramic foam, or a wire mesh.
Dependencies are inferred from the claim text.