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

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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
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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.
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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. In pyrolysis, hydrogen abstraction and reaction
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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.
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III. Typical Products of Combustion Gasoline: 2 C 8 H 18 + 25 O 2
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