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单词 catalytic converter
释义

catalytic converter


catalytic converter

n. A reaction chamber typically containing a finely divided catalyst (usually platinum and other metals such as rhodium, palladium, and gold) into which exhaust gases from an automotive engine are passed together with excess air so that carbon monoxide and hydrocarbon pollutants are oxidized to carbon dioxide and water, and nitrogen oxides are reduced to nitrogen and oxygen gases.

catalytic converter

n (Automotive Engineering) a device using three-way catalysts to reduce the obnoxious and poisonous components of the products of combustion (mainly oxides of nitrogen, carbon monoxide, and unburnt hydrocarbons) from the exhausts of motor vehicles. Sometimes shortened to: catcon

catalyt′ic convert′er


n. an automotive antipollution device that renders some pollutants in the exhaust gases harmless. [1960–65]

catalytic converter

- A device with a catalyst for converting pollutant gases into less harmful ones.See also related terms for harmful.

catalytic converter

A device removing certain pollutants from exhaust gases of vehicles running on unleaded gasoline.
Thesaurus
Noun1.catalytic converter - a converter that uses a platinum-iridium catalyst to oxidize pollutants and carbon monoxide into carbon dioxide and water; an antipollution device on an automotive exhaust systemconverter, convertor - a device for changing one substance or form or state into another
Translations
催化转化器

catalytic converter

催化转化器zhCN

catalytic converter


catalytic converter:

see internal-combustion engineinternal-combustion engine,
one in which combustion of the fuel takes place in a confined space, producing expanding gases that are used directly to provide mechanical power.
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catalytic converter

[¦kad·əl¦id·ik kən′vərd·ər] (chemical engineering) A device that is fitted to the exhaust system of an automotive vehicle and contains a catalyst capable of converting potentially polluting exhaust gases into harmless or less harmful products.

Catalytic converter

An aftertreatment device used for pollutant removal from automotive exhaust. Since the 1975 model year, increasingly stringent government regulations for the allowable emission levels of carbon monoxide (CO), hydrocarbons (HC), and oxides of nitrogen (NOx) have resulted in the use of catalytic converters on most passenger vehicles sold in the United States. The task of the catalytic converter is to promote chemical reactions for the conversion of these pollutants to carbon dioxide, water, and nitrogen.

For automotive exhaust applications, the pollutant removal reactions are the oxidation of carbon monoxide and hydrocarbons and the reduction of nitrogen oxides. Metals are the catalytic agents most often employed for this task. Small quantities of these metals, when present in a highly dispersed form (often as individual atoms), provide sites upon which the reactant molecules may interact and the reaction proceed.

Two types of catalyst systems, oxidation and three-way, are found in automotive applications. Oxidation catalysts remove only CO and HC, leaving NOx unchanged. Platinum and palladium are generally used as the active metals in oxidation catalysts. Three-way catalysts are capable of removing all three pollutants simultaneously, provided that the catalyst is maintained in a “chemically correct” environment that is neither overly oxidizing nor reducing. In both oxidation and three-way catalyst systems, the production of undesirable reaction products, such as sulfates and ammonia, must be avoided.

Maintaining effective catalytic function over long periods of vehicle operation is often a major problem. Catalytic activity will deteriorate due to two causes, poisoning of the active sites by contaminants, such as lead and phosphorus, and exposure to excessively high temperatures. To achieve efficient emission control, it is thus paramount that catalyst-equipped vehicles be operated only with lead-free fuel and that proper engine maintenance procedures be followed. See Automotive engine

catalytic converter

a device using three-way catalysts to reduce the obnoxious and poisonous components of the products of combustion (mainly oxides of nitrogen, carbon monoxide, and unburnt hydrocarbons) from the exhausts of motor vehicles
See CC
See CCO

catalytic converter


  • noun

Words related to catalytic converter

noun a converter that uses a platinum-iridium catalyst to oxidize pollutants and carbon monoxide into carbon dioxide and water

Related Words

  • converter
  • convertor
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更新时间:2025/2/25 4:31:30