| 摘要 |
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 lambda 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. |
