18.Pyrolysis.11 (1)new

18.Pyrolysis.11 (1)new - Abiotic Reactions Pyrolysis...

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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 C 3 H 8 + 5 O 2 3 CO 2 + 4 H 2 O Reaction is propagated by alkyl radicals (R . ) and singlet oxygen (O=O), often resulting in hydrogen abstraction Example – Propane Oxidation At 500 o C, C-H and C-C bonds are broken to form alkyl radicals (R ....
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18.Pyrolysis.11 (1)new - Abiotic Reactions Pyrolysis...

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