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AssigneeJohnson Matthey Public Limited Company
InventorsPaul Richard Phillips, Stuart David Reid, Daniel Swallow, James Alexander Wylie
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An exhaust system for treating an exhaust gas from an internal combustion engine is disclosed. The system comprises a modified lean NOx trap (LNT), a urea injection system, and an ammonia-selective catalytic reduction catalyst. The modified LNT comprises a first layer and a second layer. The first layer comprises a NOx adsorbent component and one or more platinum group metals. The second layer comprises a diesel oxidation catalyst zone and an NO oxidation zone. The diesel oxidation catalyst zone comprises a platinum group metal, a zeolite, and optionally an alkaline earth metal. The NO oxidation zone comprises a platinum group metal and a carrier. The modified LNT stores NOx at temperatures below about 200° C. and releases at temperatures above about 200° C. The modified LNT and a method of using the modified LNT are also disclosed.
An exhaust system for treating an exhaust gas from an internal combustion engine, comprising a modified lean NOx trap (LNT), a urea injection system, and an ammonia-selective catalytic reduction (NH3-SCR) catalyst comprising copper and a zeolite selected from the group of Framework Type consisting of an AEI or a CHA, wherein the modified LNT stores NOx at temperatures below about 200° C. and releases the stored NOx at temperatures above about 200° C. and the modified LNT comprises:
A method for treating exhaust gas from an internal combustion engine of a vehicle, comprising:
Dependencies are inferred from the claim text.