Title:
CLEANING METHOD FOR EXHAUST GAS FROM GAS ENGINE
Document Type and Number:
Japanese Patent JP3284313
Kind Code:
B2
Abstract:
PURPOSE: To provide a catalyst cleaning an exhaust gas for a long period effectively by incorporating Pt, Rh, and Ce in a spesified ratio as the three- component catalyst for the exhaust gas from a gas engine in a wash layer coated on a honeycomb carrier.
CONSTITUTION: A gaseous mixture of fuel comprising methane as a main component such as natural gas with air, after being controlled of its flow rate according to the load of an engine, is burned in a combustion chamber. The fuel-air ratio is detected by a λ sensor of a zirconia type on the front side of a three- component catalyst, for the ratio to enter a window where the three-component catalyst acts, and simultaneously the engine load is detected by a pressure sensor to feedback-control the opening of an air-bypass valve with a fuel-air ratio controller. The metal contents of Pt, Rh, and Ce of the three-component catalyst in a wash layer coated on a honeycomb carrier are controlled to be 2g/l or more, 0.2g/l or more, and 5g/l or more, respectively, based on the apparent volume of the honeycomb carrier.
Inventors:
Takeshi Tabata
Kenji Baba
Osamu Okada
Hiroki Fujita
Yoshio Imai
Akira Yamada
Mutsumi Uchida
Kenji Baba
Osamu Okada
Hiroki Fujita
Yoshio Imai
Akira Yamada
Mutsumi Uchida
Application Number:
JP22328491A
Publication Date:
May 20, 2002
Filing Date:
August 07, 1991
Export Citation:
Assignee:
OSAKA GAS CO.,LTD.
International Classes:
B01D53/94; B01J23/56; B01J23/63; F01N3/24; (IPC1-7): B01D53/94; B01J23/63; F01N3/24
Domestic Patent References:
| JP4250826A |
Attorney, Agent or Firm:
Takami Hirose
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