Exhaust system for a lean-burn IC engine comprising a PGM component and a SCR catalyst

  • Inventors:
  • Assignees: Johnson Matthey Plc
  • Publication Date: January 23, 2013
  • Publication Number: GB-201222277-D0

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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