5.13 What are "carbonyl" compounds?
Description
This article is from the Gasoline FAQ, by Bruce Hamilton with numerous contributions by others.
5.13 What are "carbonyl" compounds?
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, refer to
section 5.5 for typical reductions for aldehydes.
Typical carbonyls are:-
* aldehydes ( containing -CHO ),
- formaldehyde (HCHO) - which is formed in large amounts during lean
combustion of methanol [90].
- acetaldehyde (CH2CHO) - which is formed during ethanol combustion.
- acrolein (CH2=CHCHO) - a very potent irritant and toxin.
* ketones ( containing C=0 ),
- acetone (CH3COCH3)
* carboxylic acids ( containing -COOH ),
- formic acid (HCOOH) - formed during lean methanol combustion.
- acetic acid (CH3COOH).
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