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AssigneeJohnson Matthey Public Limited Company
InventorsAgnes RAJ, Raj RAJARAM, Gudmund SMEDLER, David THOMPSETT
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The present invention relates to a compressed natural gas combustion and exhaust system comprising: (i) a natural gas combustion engine; and (ii) an exhaust treatment system, the exhaust treatment system comprising a intake for receiving an exhaust gas from the combustion engine and a catalyst article arranged to receive and treat the exhaust gas, wherein the catalyst article comprises: a substrate having at least first and second coatings, the first coating being free from platinum-group-metals and comprising a copper-containing zeolite having the CHA framework-type and the second coating comprising a palladium-containing zeolite, wherein the first coating is arranged to contact the exhaust gas before the second coating. The present invention further relates to a method and a use.
A compressed natural gas combustion and exhaust system comprising:
A method for the treatment of an exhaust from a natural gas combustion engine, the method comprising:
Use of a copper-doped CHA zeolite in an exhaust system as a sulphur-trap to protect a downstream palladium-containing zeolite catalyst.
Dependencies are inferred from the claim text.