Kinetic studies of oxidative coupling of methane on samarium oxide

S. N. Vereshchagin; J. R.H. Ross

doi:10.1016/0920-5861(95)00045-H

Kinetic studies of oxidative coupling of methane on samarium oxide

S. N. Vereshchagin, J. R.H. Ross

University of Twente

Research output: Contribution to journal › Article › peer-review

Abstract

Kinetic behaviour of three samples of samarium oxide (cubic (Sm-1), monoclinic (Sm-3) and mixed cubic-monoclinic (Sm 2)) were studied in the oxidative coupling of methane using a gradientless flow circulation system. The specific rate of C₂-product formation differed by a factor of 6-8 for Sm-1 and Sm-3. The specific activity for CO formation did not depend upon the crystal structure of samarium oxide while the rate of formation of CO₂ was different for the samples studied. It is proposed that formation of CO and CO₂ occurs via different reaction routes. The rate of CO₂ formation at high CH₄/O₂ ratio is limited by oxidant activation or surface CO₂-complex decomposition.

Original language	English
Pages (from-to)	285-287
Number of pages	3
Journal	Catalysis Today
Volume	24
Issue number	3
DOIs	https://doi.org/10.1016/0920-5861(95)00045-H
Publication status	Published - 23 Jun 1995
Externally published	Yes

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abstract = "Kinetic behaviour of three samples of samarium oxide (cubic (Sm-1), monoclinic (Sm-3) and mixed cubic-monoclinic (Sm 2)) were studied in the oxidative coupling of methane using a gradientless flow circulation system. The specific rate of C2-product formation differed by a factor of 6-8 for Sm-1 and Sm-3. The specific activity for CO formation did not depend upon the crystal structure of samarium oxide while the rate of formation of CO2 was different for the samples studied. It is proposed that formation of CO and CO2 occurs via different reaction routes. The rate of CO2 formation at high CH4/O2 ratio is limited by oxidant activation or surface CO2-complex decomposition.",

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N2 - Kinetic behaviour of three samples of samarium oxide (cubic (Sm-1), monoclinic (Sm-3) and mixed cubic-monoclinic (Sm 2)) were studied in the oxidative coupling of methane using a gradientless flow circulation system. The specific rate of C2-product formation differed by a factor of 6-8 for Sm-1 and Sm-3. The specific activity for CO formation did not depend upon the crystal structure of samarium oxide while the rate of formation of CO2 was different for the samples studied. It is proposed that formation of CO and CO2 occurs via different reaction routes. The rate of CO2 formation at high CH4/O2 ratio is limited by oxidant activation or surface CO2-complex decomposition.

AB - Kinetic behaviour of three samples of samarium oxide (cubic (Sm-1), monoclinic (Sm-3) and mixed cubic-monoclinic (Sm 2)) were studied in the oxidative coupling of methane using a gradientless flow circulation system. The specific rate of C2-product formation differed by a factor of 6-8 for Sm-1 and Sm-3. The specific activity for CO formation did not depend upon the crystal structure of samarium oxide while the rate of formation of CO2 was different for the samples studied. It is proposed that formation of CO and CO2 occurs via different reaction routes. The rate of CO2 formation at high CH4/O2 ratio is limited by oxidant activation or surface CO2-complex decomposition.

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Kinetic studies of oxidative coupling of methane on samarium oxide

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