Three-way catalytic process for gaseous streams
AssigneeUnion Carbide Corporation
InventorsJames S. Ritscher, Michael R. Sandner
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Abstract
A process for the catalytic combustion of carbon monoxide and hydrocarbons and the catalytic reduction of the oxides of nitrogen contained in a gas stream. The process involves intimately contacting the gaseous stream with a catalyst bed comprising copper metal or copper ion and a high silica zeolite.
Claims12
A process for the concurrent catalytic reduction of oxides of nitrogen and the oxidation of carbon monoxide and hydrocarbons contained in a gas stream wherein said process consists essentially of contacting the gas stream with a high-silica zeolite containing copper metal or ions, said zeolite having a silica to alumina ratio of at least 20, and wherein said gas stream contains a stoichiometric excess of oxidant.
A process for the concurrent catalytic reduction of oxides of nitrogen and the oxidation of carbon monoxides and hydrocarbons contained in the exhaust stream of an internal combustion engine wherein said process comprises contacting the exhaust stream with copper-containing high-silica zeolite at a temperature of about 350.degree. C. or greater in the presence of oxygen and when the reductant to oxidant ratio is between about 0.50 and 2.39.
Dependencies are inferred from the claim text.