| 摘要 |
The activity of catalytic engines is maintained over time, preferably while reducing emissions of pollutants. Platinum group catalysts deposit on the internal surfaces of the cylinder which make up the combustion chamber. In one embodiment, wherein the engines are equipped with particulate traps, through the use of mechanical modifications such as exhaust gas recirculation and engine timing modification, it is possible to reduce the emissions of NOx by significant amounts. In another embodiment, a multi-metal catalyst composition, comprising a combination of a platinum metal catalyst composition and at least one auxiliary catalyst metal, is added to the cylinder (as part of the fuel, separate injection, lubricating oil, or the combustion air) prior to combustion to provide catalyst metal to the cylinder and the exhaust system including a diesel trap to lower the balance point of the particulate trap (the temperature at which the rate of trap loading equals the rate of regeneration), while achieving the advantages of catalyst activity maintenance and preferably also lowering the emissions of carbon monoxide and unburned hydrocarbons. |
