Title:
圧縮点火内燃機関用の複合ゾーン化酸化触媒
Document Type and Number:
Japanese Patent JP7407917
Kind Code:
B2
Abstract:
A composite oxidation catalyst (14, 16, 18, 20) for use in an exhaust system for treating an exhaust gas produced by a vehicular heavy-duty diesel vehicle, and upstream of a particulate matter filter (44, 50) in the exhaust system comprises: a substrate (5), optionally a honeycomb flow-through substrate monolith, having a total length L and a longitudinal axis and having a substrate surface extending axially between a first substrate end (I) and a second substrate end (O); and three or more catalyst washcoat zones (1, 2, 3; or 1, 2, 3, 4) arranged axially in series on and along the substrate surface, wherein a first catalyst washcoat zone (1) having a length Li, wherein Li < L, is defined at one end by the first substrate end and at a second end by a first end (19, 21) of a second catalyst washcoat zone (2) having a length L2, wherein L2 < L, wherein the first catalyst washcoat zone (1) comprises a first refractory metal oxide support material and two or more platinum group metal components supported thereon comprising both platinum and palladium at a weight ratio of platinum to palladium of <1; the second catalyst washcoat zone (2) comprises a second refractory metal oxide support material and one or more platinum group metal components supported thereon, and a third catalyst washcoat zone (3) comprising a third refractory metal oxide support material and one or more platinum group metal components supported thereon is defined at a second end thereof by the second substrate end (O), wherein a total platinum group metal loading in the first catalyst washcoat zone (1) defined in grams of platinum group metal per litre of substrate volume (g/L) is greater than a total platinum group metal loading in the second catalyst washcoat zone (2), wherein a total platinum group metal loading in the third catalyst washcoat zone defined (3) in grams of platinum group metal per litre of substrate volume (g/L) is less than the total platinum group metal loading in the second catalyst washcoat zone and wherein the first catalyst washcoat zone (1) comprises one or more first alkaline earth metal components supported on the first refractory metal oxide support material.
Inventors:
Siffie, Andrew Francis
Call, Keeran
Cooper, Oliver
Dally, Christopher
Gilbert, Lee Alexander
Hanley, Robert
Mikarev, David
Morrow, Francois
Phillips, Paul
Pratt, George
Call, Keeran
Cooper, Oliver
Dally, Christopher
Gilbert, Lee Alexander
Hanley, Robert
Mikarev, David
Morrow, Francois
Phillips, Paul
Pratt, George
Application Number:
JP2022520467A
Publication Date:
January 04, 2024
Filing Date:
October 13, 2020
Export Citation:
Assignee:
JOHNSON MATTHEY PUBLIC LIMITED COMPANY
International Classes:
B01D53/94; B01J23/58; B01J23/656; B01J35/57; F01N3/035; F01N3/20; F01N3/28
Domestic Patent References:
| JP2016513584A | ||||
| JP2010500922A | ||||
| JP2013146706A | ||||
| JP2017508606A | ||||
| JP2009501079A | ||||
| JP61074650A | ||||
| JP9057102A | ||||
| JP61238347A | ||||
| JP61164647A |
Attorney, Agent or Firm:
Norito Yamao
Haruhiko Ema
Haruhiko Ema