Johnson Matthey Public Limited Company

Tim Genschow

Gudmund Smedler

Olivier Sonntag

Andrew Newman

Isabel Zoe Tingay

Andrew Peter Walker

Jane Gast

Mikael Larsson

Penelope Markatou

Lingzhi Zhang

Provided is a system for treating an exhaust gas comprising a first SCR catalyst zone comprising an iron loaded medium- or large-pore molecular sieve having a first ammonia storage capacity; and a second SCR catalyst zone comprising a copper loaded small-pore molecular sieve having a second ammonia storage capacity, wherein the first SCR catalyst zone is disposed upstream of the second SCR catalyst zone with respect to normal exhaust gas flow through the system and wherein the second ammonia storage capacity is greater than the first ammonia storage capacity. Also provided is a method for using the system to treat exhaust gas.

Zoned catalyst for treating exhaust gas

Provided is a system for treating an exhaust gas comprising a first SCR catalyst zone comprising vanadium loaded on a metal oxide selected from TiO, ZrO, SiO, CeO, and AlO; and a second SCR catalyst zone comprising a copper loaded small-pore molecular sieve, wherein the first SCR catalyst zone is disposed upstream of the second SCR catalyst zone with respect to normal exhaust gas flow through the system. Also provided is a method for using the system to treat exhaust gas.

Provided is a catalytic article comprising (a) a flow through honeycomb substrate having channel walls; (b) a first NH-SCR catalyst composition coated on and/or within the channel walls in a first zone; and (c) a second NH-SCR catalyst composition coated on and/or within the channel walls in a second zone, provided that the first zone is upstream of the second zone and the first and second zones are adjacent or at least partially overlap; and wherein the first NH-SCR catalyst comprises a first copper loaded molecular sieve having a copper to aluminum atomic ratio of about 0.1 to 0.375 and the second NH-SCR catalyst comprises a second copper loaded molecular sieve having a copper-to-aluminum atomic ratio of about 0.3 to about 0.6.

Catalytic article for treating exhaust gas

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Royston, United Kingdom

Tim Genschow