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Kinetics of Methane Catalytic Combustion on Mn-Substituted Barium Hexaaluminate Catalysts

โœ Scribed by V. Pitchon; D. Yu. Murzin

Publisher
John Wiley and Sons
Year
2001
Tongue
English
Weight
353 KB
Volume
24
Category
Article
ISSN
0930-7516

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โœฆ Synopsis

The oxidation of methane has been studied in the temperature range 475 C ยฃ T ยฃ 660 C isothermally using Mn-substituted barium hexaaluminate catalysts. The solid material was characterized by BET, XRD and TPD of oxygen. Reproducible oxidation rates are provided and the effects of varying both methane (3.8ยฑ18.8 Torr) and oxygen (22.8ยฑ114 Torr) partial pressure at various reaction temperatures are presented to generate experimental databases. The suitability of several kinetic expressions, which is based on reaction mechanisms that have been advanced in the literature to represent the experimental data was assessed. On the whole, several mechanistic models provided an adequate fit to the entire experimental data sets. Appreciable deviations of the predicted from the actual reaction rates have allowed us to discriminate between the various mechanistic models. The best description was obtained for a model featuring a two-step reaction sequence on a nonuniform surface.

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