Exhaust system for a lean-burn IC engine comprising a PGM component and a SCR catalyst
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United States of America Patent
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Mar 11, 2014
Grant Date -
Jun 13, 2013
app pub date -
Dec 11, 2012
filing date -
Dec 12, 2011
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Abstract
An exhaust system 10 for a vehicular lean-burn internal combustion engine comprises:
- (a) a first substrate monolith 6 comprising a SCR catalyst;(b) at least one second substrate monolith 4 comprising a catalytic washcoat coating comprising at least one platinum group metal (PGM) disposed upstream of the first substrate monolith; and(c) a third substrate monolith 2 disposed between the first substrate monolith and the or each second substrate monolith,wherein at least one PGM on the or each second substrate monolith 4 is liable to volatilise when the or each second substrate monolith 4 is exposed to relatively extreme conditions including relatively high temperatures, and wherein the third substrate monolith 2 comprises a washcoat coating comprising at least one metal oxide for trapping volatilised PGM.
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