Title:
Catalyst-ized substrate monolith
Document Type and Number:
Japanese Patent JP6104272
Kind Code:
B2
Abstract:
An exhaust system (20) for a lean-burn internal combustion engine comprises: a first A catalysed flow-through substrate monolith (12) for use in treating exhaust gas emitted from a the lean-burn internal combustion engine, which catalysed flow-through substrate monolith (12) comprising a first washcoat coating (16) and a second washcoat coating (18), wherein the first washcoat coating (16) comprises a catalyst composition comprising at least one platinum group metal (PGM) and at least one support material for the at least one PGM, wherein the at least one PGM in the first washcoat coating (16) comprises platinum; or both platinum and palladium at a weight ratio of greater than 2:1, which is liable to volatilise when the first washcoat coating is exposed to relatively extreme conditions including relatively high temperatures of ≥700°C, wherein the second washcoat coating comprises, for trapping volatilised PGM, at least one metal oxide selected from the group consisting of optionally stabilised alumina, amorphous silica-alumina, optionally stabilised zirconia, ceria, titania, an optionally stabilised ceria-zirconia mixed oxide and mixtures of any two or more thereof supporting at least one metal, which is palladium, for trapping volatilised PGM and wherein the second washcoat coating (18) is oriented to contact exhaust gas that has contacted the first washcoat coating; a second catalysed substrate monolith (14) comprising a selective catalytic reduction (SCR) catalyst, which second catalysed substrate monolith (14) is disposed downstream from the first catalysed flow-through substrate monolith (12); and an injector (13) for injecting nitrogenous reductant into exhaust gas between the first catalysed flow-through substrate monolith (12) and the second catalysed substrate monolith (14).
Inventors:
Breakman, philip
Brown, gavin michael
Chatterjee, Sogat
Chiffy, Andrew Francis
Gust, Jane
Philips, Paul Richard
Rajlam, Raj
Glenn Spreezer
Walker, andrew
Brown, gavin michael
Chatterjee, Sogat
Chiffy, Andrew Francis
Gust, Jane
Philips, Paul Richard
Rajlam, Raj
Glenn Spreezer
Walker, andrew
Application Number:
JP2014545366A
Publication Date:
March 29, 2017
Filing Date:
December 11, 2012
Export Citation:
Assignee:
JOHNSON MATTHEY PUBLIC LIMITED COMPANY
International Classes:
B01J35/04; B01D53/94; B01J23/42; B01J23/44; F01N3/022; F01N3/035; F01N3/08; F01N3/10; F01N3/24; F01N3/28
Foreign References:
| WO2010118125A2 | ||||
| US20110138777 |
Attorney, Agent or Firm:
Sonoda Yoshitaka
Kobayashi Yoshinori
Kobayashi Yoshinori
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