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发表于 17-3-2012 02:09 PM
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http://en.wikipedia.org/wiki/Catalytic_converter
Catalytic converter
From Wikipedia, the free encyclopedia
Catalytic converter on a 1996 Dodge Ram Van
A catalytic converter (colloquially, "cat" or "catcon") is an exhaust emission control device which converts toxic chemicals in the exhaust of an internal combustion engine into less noxious substances. Inside a catalytic converter, a catalyst stimulates a chemical reaction in which noxious byproducts of combustion are converted to less toxic substances by way of catalysed chemical reactions. The specific reactions vary with the type of catalyst installed. Most present-day vehicles that run on gasoline are fitted with a "three way" converter, so named because it converts the three main pollutants in automobile exhaust: an oxidising reaction converts carbon monoxide (CO) and unburned hydrocarbons (HC), and a reduction reaction converts oxides of nitrogen (NOx) to produce carbon dioxide (CO2), nitrogen (N2), and water (H2O).[1]
The first widespread introduction of catalytic converters was in the United States market, where 1975 model year gasoline-powered automobiles were so equipped to comply with tightening U.S. Environmental Protection Agency regulations on automobile exhaust emissions.[2][3][4][5] These were "two-way" converters which combined carbon monoxide (CO) and unburned hydrocarbons (HC) to produce carbon dioxide (CO2) and water (H2O). Two-way catalytic converters of this type are now considered obsolete, having been supplanted except on lean burn engines[citation needed] by "three-way" converters which also reduce oxides of nitrogen (NOx).[2]
Catalytic converters are still most commonly used on automobile exhaust systems, but are also used on generator sets, forklifts, mining equipment, trucks, buses, locomotives, airplanes and other engine fitted devices. They are also used on some wood stoves to control emissions.[6] This is usually in response to government regulation, either through direct environmental regulation or through health and safety regulations.
是control排气量的.....
有没有找刹车场看看?? |
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