Hydrogen abstraction by radicals is an interimolecular and radical-exchange reaction. The low molecular radicals (i.e CHº3 or Hº ) tend to abstract hydrogen radicals from hydrocacbons with relatively lower energy. The activation energy of this hydrogen abstraction is estimated as about 30kj/mol

The radicals generated by hydrogen abstraction are far less stable than the feed hydrocacbons and are casily decomposed into lower molecular olefins and radicals. The activation energy of the decomposition is estimated as about 120 – 210 kj/mol, and the lower molecular radicals have a relatively larger activation energy.

Due to the above reasons, larger molecular paraffins are gradually decomposed into lower molecular olefins.

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