B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 53/94 (2006.01) B01J 21/04 (2006.01) B01J 23/63 (2006.01) B01J 35/00 (2006.01) B01J 37/02 (2006.01) F01N 3/08 (2006.01)
Patent
CA 2729241
The lean NOx trap catalyst composition of the present invention comprises distinct layers, or zone configuration or multi-brick arrangement. The top layer, front zone or front brick is free of any alkali or alkaline earth NOx trapping components. The under layer, rear zone or rear brick may contain any desirable NOx trapping component in contact with a precious metals group catalyst (e.g., Pt). Catalysts of this invention show wide temperature operation window with superior low temperature per-formance.
La présente invention concerne une composition de catalyseur de piégeage doxyde dazote de mélange pauvre comportant des couches distinctes, ou une configuration de zones ou un agencement multi-briques. La couche supérieure, la zone avant ou la brique avant est exempte de composants alcalins ou alcalino-terreux de piégeage doxyde dazote. La sous-couche, la zone arrière ou la brique arrière peut contenir tout composant de piégeage doxyde dazote en contact avec un catalyseur de groupe de métaux précieux (par exemple, Pt). Les catalyseurs selon la présente invention présentent un large créneau de fonctionnement de température à performance à basse température.
Basf Corporation
Sim & Mcburney
LandOfFree
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