公开(公告)号：EP1735146A2

公开(公告)日：2006-12-27

申请号：EP05723111.0

申请日：2005-02-15

Applicant: CORNING INC.

Inventor： TAO, Tinghong ,  WANG, Jianguo

IPC: B32B3/26

CPC classification number: B01D39/2075 ,  B01J35/04 ,  B01J37/0018 ,  B01J37/0217 ,  B01J37/082 ,  C04B38/0096 ,  C04B41/009 ,  C04B41/52 ,  C04B41/89 ,  C04B2111/00793 ,  C04B2111/0081 ,  Y10T428/24149 ,  Y10T428/249953 ,  C04B35/00 ,  C04B38/0064 ,  C04B38/067 ,  C04B35/195 ,  C04B38/0006 ,  C04B41/457 ,  C04B41/48 ,  C04B41/4535 ,  C04B41/5031 ,  C04B35/46 ,  C04B35/478

Abstract: Porous ceramic catalyst supports or filters to be provided with catalyst coatings via oxide washcoating processes are pre-coated with cross-linked polymer barrier layers to prevent washcoat nanoparticle intrusion into the microcracked and/or microporous surfaces of the ceramics, the barrier coatings being formed by thermally cross-linking hydrocarbon polymers that are vaporizable at moderate washcoat stabilization or catalyst activation temperatures and being preferentially block the micropore/microchannel pore volume of the article.

公开(公告)号：EP1960086A1

公开(公告)日：2008-08-27

申请号：EP06839161.4

申请日：2006-12-07

Applicant: CORNING INC.

Inventor： BEALL, Douglas M ,  HEIBEL, Achim K ,  TAO, Tinghong

IPC: B01D46/24 ,  B01D53/94 ,  B01J37/02 ,  F01N3/025 ,  F01N3/035

CPC classification number: B01D53/944 ,  B01J35/0006 ,  B01J35/04 ,  B01J37/0201 ,  B01J37/0215 ,  F01N3/0222 ,  F01N3/035 ,  F01N2330/06 ,  F01N2330/30 ,  F01N2510/0682 ,  Y02A50/2341

Abstract: A coated diesel exhaust filter is provided that applies a relatively low pressure drop across the exhaust system despite the buildup of soot deposits. The filter includes a porous ceramic structure having an inlet end, an outlet end, and a plurality of gas inlet and gas outlet channels disposed between the inlet and outlet ends, the channels being separated by porous ceramic walls. A catalyst is distributed at least partly within the porous ceramic walls of the structure, and is distributed at a higher concentration within portions of the ceramic walls adjacent to the outlet surfaces than within portions of the ceramic walls adjacent the inlet surfaces. Both the inlet and outlet surfaces are substantially free of the catalyst in order to maintain a gas-conducting porosity in these surfaces. The resulting filter effectively treats nitrogen oxides, carbon monoxide and unburned hydrocarbons present in the exhaust gas stream while advantageously imposing a relatively low pressure drop across the exhaust system even when soot deposits accumulate on the inlet surfaces of the ceramic walls.