The internal combustion engine emits various air pollutants, these are mainly
Carbon monoxide, oxides of nitrogen, unburnt hydrocarbons
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Nitrogen dioxide aids in the formation of low level ozone which leads to
Respiratory irritation
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Nitrogen dioxide released into the atmosphere is converted into nitric acid, this leads to
Acid rain
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Volatile organic compounds are released form vehicle exhaust gases, these are usually
Unburnt fuels
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Benzene and buta- 1,3-diene are
Known carcinogens
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Low level ozone can lead to
Breathing difficulties
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Catalytic converters are made in the shape of
Honeycomb
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There are two types of catalytic converters commonly in use
Oxidation catalysts and three way catalysts
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In oxidation catalysts which reaction takes place
2CO + O2 -->2CO2 and C12H26 +18.5O2 --> 12CO2 +13H2O
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In three way catalysts which reaction takes place
2NO + 2CO --> N2 + 2CO2
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NO and CO gas molecules diffuse over the catalytic surface, they are then adsorbed, temporary bonds formed between catalytic surface and gas molecules, molecules react together, deadsorbed
This is how a three way catalyst works
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Other cards in this set
Card 2
Front
Nitrogen dioxide aids in the formation of low level ozone which leads to
Back
Respiratory irritation
Card 3
Front
Nitrogen dioxide released into the atmosphere is converted into nitric acid, this leads to
Back
Card 4
Front
Volatile organic compounds are released form vehicle exhaust gases, these are usually
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