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What are “carbonyl” compounds?

April 26, 2017carbonyl compounds

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What are “carbonyl” compounds?

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Carbonyls are produced in large amounts under lean operating conditions, especially when oxygenated fuels are used. Most carbonyls are toxic, and the carboxylic acids can corrode metals. The emission of carbonyls can be controlled by combustion stoichiometry and exhaust catalysts. Typical carbonyls are:- • aldehydes ( containing -CHO ), • formaldehyde (HCHO) – which is formed in large amounts during lean combustion of methanol [58]. • acetaldehyde (CH2CHO) – which is formed during ethanol combustion. • acrolein (CH2=CHCHO) – a very potent irritant. • ketones ( containing C=0 ), • acetone (CH3COCH3) • carboxylic acids ( containing -COOH ), • formic acid (HCOOH) – formed during lean methanol combustion. • acetic acid (CH3COOH).