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The formation of hydrogen in ethylene pyrolysis at 900 K
Author(s) -
Jayaweera Indira S.,
Pacey Philip D.
Publication year - 1988
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.550200906
Subject(s) - chemistry , ethylene , pyrolysis , hydrogen , cyclohexene , equilibrium constant , reaction rate constant , work (physics) , carbon fibers , constant (computer programming) , thermodynamics , analytical chemistry (journal) , organic chemistry , kinetics , catalysis , physics , materials science , quantum mechanics , composite number , computer science , composite material , programming language
Ethylene at concentrations of 2.7 × 10 −3 to 1.0 × 10 −2 mol L −1 has been pyrolyzed at 900 K in a flow system. The products ethane and hydrogen have been analyzed by gas chromatography. The results are consistent with a mechanism in which these products are initially formed as follows:Reaction [1] occurs only 1 to 2% as often as the addition reaction,The latter reaction is close to equilibrium. Taking the rate constant, k 4 , and the equilibrium constant, K 2 , from the literature and making small adjustments for minor processes, k 1 is found to be (9 ± 3) × 10 7 L mol −1 s −1 . Here the uncertainty is intended to encompass errors in the present work and in the literature parameters. A secondary source of hydrogen was also observed. Its dependence on ethylene concentration was consistent with formation from an intermediate with six carbon atoms, such as cyclohexene.