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EP0382434A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Purification of exhaust gas from diesel engine

Assignee: Nippon Shokubai Co Ltd
•
Filing: 1990-02-02
•
Granted: —
•
Expires: 2010-02-02
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Abstract

Abstract A novel catalyst for use in purificatioin of exhaust gases from diesel engines is provided. This catalyst is a flow-through type honeycomb catalyst having parallel through cells and characterized in that (1) its cross-sectional area at the inlet part of an exhaust gas cut by a face vertical to the direction of the through cells is 10 to 100 cm², preferably 20 to 80 cm² per liter of the displacement of the engine. (2) the hydraulic diameter of the through cells is 1.00 to 2.00 mm, preferably 1.10 to 1.40 mm, and (3) percentage of open frontal area at the inlet part of the exhaust gas is 40 to 95 % preferably 50 to 85%. This catalyst can be one wherein a catalytically active component itself is extruded into a honeycomb shape or one wherein a catalytically active component is deposited on a honeycomb carrier.

Inventors

  • 👤 Makoto Horiuchi
  • 👤 Noboru Miyake
  • 👤 Toshimasa Kushihara
  • 👤 Koichi Saito

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-06 02:26
CPC Classifications
B; B01; B01J; B01J35/00; B01J35/50; B01J35/56; B01J35/57; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/944; B01D53/9495; F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/24; F01N3/28; F01N3/2803; F01N3/2807; F01N3/281; F01N3/2825; F01N3/2828; F02; F02B; F02B3/00; F02B3/06; B01D2258/00; B01D2258/01; B01D2258/012

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 97 words
A catalyst for use in the purification of an exhaust gas from a diesel engine which catalyst is a flow-through type honeycomb catalyst having through cells parallel to the direction of flow of the gas, wherein the cross-sectional area of a face vertical to the direction of flow of exhaust at the inlet for exhaust gas is 10 to 100 cm² per liter of the displacement of the engine, the hydraulic diameter of the through cells is 1.00 to 2.00 mm, and percentage of open frontal area at the inlet for exhaust gas is 40 to 95%.
Claim 2
Dependent Claim 97 words
A catalyst for use in the purification of an exhaust gas from a diesel engine which catalyst is a flow-through type honeycomb catalyst having through cells parallel to the direction of flow of the gas, wherein the cross-sectional area of a face vertical to the direction of flow of exhaust at the inlet for exhaust gas is 10 to 100 cm² per liter of the displacement of the engine, the hydraulic diameter of the through cells is 1.00 to 2.00 mm, and percentage of open frontal area at the inlet for exhaust gas is 40 to 95%.
Claim 3
Dependent Claim 42 words
A catalyst according to claim 1 wherein said cross-sectional area is 20 to 80 cm² per liter of the displacement of the engine, the hydraulic diameter is 1.10 to 1.40 mm, and the percentage of open frontal area is 50 to 85%.
Claim 4
Dependent Claim 31 words
A catalyst according to claim 1 or 2 wherein the flow-through honeycomb catalyst is one wherein at least one catalytically active component is deposited on a metal honeycomb or ceramic honeycomb.
Claim 5
Dependent Claim 18 words
An exhaust system for a diesel engine comprising a catalyst as claimed in claim 1, 2 or 3.
Claim 6
Dependent Claim 23 words
Use of a catalyst as claimed in claim 1, 2 or 3 in the purification of an exhaust gas from a diesel engine.

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