Title:
MULTI-ZONE CATALYTIC CONVERTER
Document Type and Number:
WIPO Patent Application WO2004002621
Kind Code:
A3
Abstract:
Provided is an exhaust article (catalyst) coated on a single substrate, such as a monolithic honeycomb having a plurality of channels along the axial length of the catalyst. Different washcoat compositions are deposited along the length the channel walls of the substrate beginning from either the inlet or outlet axial end of the substrate to form inlet and outlet catalyst layers, respectively. In the coating process, the channel walls are coated with catalyst washcoat compositions to lengths that are less than the substrates' axial length. The architecture of the resulting catalyst layers defines a plurality of zones along the length of the substrate. The properties of each zone of the catalyst can be optimized to address specific catalyst functions by manipulation of both the coating lengths and the catalyst washcoat compositions.
Inventors:
KUMAR SANATH V
RABINOWITZ HAROLD N
STEGER JOHN J
RABINOWITZ HAROLD N
STEGER JOHN J
Application Number:
PCT/US2003/019977
Publication Date:
April 15, 2004
Filing Date:
June 24, 2003
Export Citation:
Assignee:
ENGELHARD CORP (US)
International Classes:
F01N3/10; B01D53/94; B01J23/44; B01J23/58; B01J23/63; B01J23/89; B01J35/04; F01N3/08; F01N3/28; F01N13/02; (IPC1-7): B01J23/44; B01J35/04; F01N3/08
Domestic Patent References:
| WO1995000235A1 | 1995-01-05 |
Foreign References:
| US6180075B1 | 2001-01-30 |
Other References:
See also references of EP 1519786A2
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