18.pyrolysis.10 - Abiotic Reactions: Pyrolysis Combustion...

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Unformatted text preview: Abiotic Reactions: Pyrolysis Combustion as a Source of Chemicals Properties of Combustion Typical Products of Combustion PAHs, PCDDs and PCDFs Combustion Products from Tobacco Functions of a Catalytic Converter Summary and Conclusions I. Combustion as a Source of Chemicals Many combustive processes result in the formation of new contaminants. Pyrolysis is chemical degradation via combustion. New contaminants are generated by pyrosynthesis or pyrogenesis. II. Properties of Combustion Combustion represents an oxidative process. Combustion requires: fuel + oxidizer + activation energy. Is typified by the general reaction of all hydrocarbons. Example propane: C 3 H 8 + 5 O 2 3 CO 2 + 4 H 2 O The reaction is propagated by alkyl radicals (R . ) and singlet oxygen. Example Propane Oxidation At temperatures above 500 o C, C-H and C-C bonds are broken to form alkyl radicals (R . ). Radicals then react with singlet oxygen. III. Typical Products of Combustion Gasoline: 2 C 8 H 18 + 25 O...
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18.pyrolysis.10 - Abiotic Reactions: Pyrolysis Combustion...

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