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Kinetics and mechanism of the catalytic oxidation of methane over lithium-promoted magnesium oxide

Amorebieta, V. T. and Colussi, A. J. (1988) Kinetics and mechanism of the catalytic oxidation of methane over lithium-promoted magnesium oxide. Journal of Physical Chemistry, 92 (16). pp. 4576-4578. ISSN 0022-3654 . http://resolver.caltech.edu/CaltechAUTHORS:20150623-154810086

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Abstract

The kinetics of methane oxidation in CH_4/O_2 mixtures over 7% lithium-promoted magnesium oxide has been investigated by dynamic mass spectrometry between 800 and 1100 K. At low pressures, rates become first order and half-order with respect to methane and oxygen, respectively, directly revealing the reversible dissociative chemisorption of O_2 on the catalyst. Otherwise, the complex rate law applicable over the entire range of pressures studied here can be accounted for by assuming competitive Langmuir adsorption of both reactants followed by chemical reaction of CH_4 (g) with chemisorbed oxygen. The rate constant for methane oxidation exhibits Arrhenius behavior with E_s = 86 kJ mol^(-1). Trapping of reactive species with iodine in a tandem reactor confirms the presence of methyl radical in the gas phase.


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Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/j100327a003DOIArticle
http://pubs.acs.org/doi/abs/10.1021/j100327a003PublisherArticle
ORCID:
AuthorORCID
Colussi, A. J.0000-0002-3400-4101
Additional Information:© 1988 American Chemical Society. (Received: April 19, 1988)
Record Number:CaltechAUTHORS:20150623-154810086
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150623-154810086
Official Citation:Kinetics and mechanism of the catalytic oxidation of methane over lithium-promoted magnesium oxide V. T. Amorebieta and A. J. Colussi The Journal of Physical Chemistry 1988 92 (16), 4576-4578 DOI: 10.1021/j100327a003
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:58529
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:24 Jun 2015 21:50
Last Modified:24 Jun 2015 21:50

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