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Microwave assisted heterogeneous catalysis: effects of varying oxygen concentrations on the oxidative coupling of methane

Microwave assisted heterogeneous catalysis: effects of varying oxygen concentrations on the oxidative coupling of methane
Microwave assisted heterogeneous catalysis: effects of varying oxygen concentrations on the oxidative coupling of methane
The oxidative coupling of methane was investigated over alumina supported La2O3/CeO2 catalysts under microwave dielectric heating conditions at different oxygen concentrations. It was observed that, at a given temperature using microwave heating, selectivities for both ethane and ethylene were notably higher when oxygen was absent than that in oxygen/methane mixtures. The differences were attributed to the localised heating of microwave radiation resulting in temperature inhomogeneity in the catalyst bed. A simplified model was used to estimate the temperature inhomogeneity; the temperature at the centre of the catalyst bed was 85 °C greater than that at the periphery when the catalyst was heated by microwaves in a gas mixture with an oxygen concentration of 12.5% (v/v), and the temperature difference was estimated to be 168 °C in the absence of oxygen.
0133-1736
287-302
Ni, B.H.
99565844-dd5c-4aec-915e-0561fe91d37b
Lee, C.
774e8767-13f8-4725-bc9f-c1200ccd78ab
Sun, R.C.
49f70bde-71e3-475b-a9dd-918cb35db3c3
Zhang, X.L.
d7cf1181-3276-4da1-9150-e212b333abb1
Ni, B.H.
99565844-dd5c-4aec-915e-0561fe91d37b
Lee, C.
774e8767-13f8-4725-bc9f-c1200ccd78ab
Sun, R.C.
49f70bde-71e3-475b-a9dd-918cb35db3c3
Zhang, X.L.
d7cf1181-3276-4da1-9150-e212b333abb1

Ni, B.H., Lee, C., Sun, R.C. and Zhang, X.L. (2009) Microwave assisted heterogeneous catalysis: effects of varying oxygen concentrations on the oxidative coupling of methane. Reaction Kinetics and Catalysis Letters, 98 (2), 287-302. (doi:10.1007/s11144-009-0089-y).

Record type: Article

Abstract

The oxidative coupling of methane was investigated over alumina supported La2O3/CeO2 catalysts under microwave dielectric heating conditions at different oxygen concentrations. It was observed that, at a given temperature using microwave heating, selectivities for both ethane and ethylene were notably higher when oxygen was absent than that in oxygen/methane mixtures. The differences were attributed to the localised heating of microwave radiation resulting in temperature inhomogeneity in the catalyst bed. A simplified model was used to estimate the temperature inhomogeneity; the temperature at the centre of the catalyst bed was 85 °C greater than that at the periphery when the catalyst was heated by microwaves in a gas mixture with an oxygen concentration of 12.5% (v/v), and the temperature difference was estimated to be 168 °C in the absence of oxygen.

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Published date: 2009

Identifiers

Local EPrints ID: 69856
URI: http://eprints.soton.ac.uk/id/eprint/69856
ISSN: 0133-1736
PURE UUID: ffeac130-620d-45d4-8aa0-8f98ebb166c4
ORCID for X.L. Zhang: ORCID iD orcid.org/0000-0002-4375-1571

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Date deposited: 08 Dec 2009
Last modified: 14 Mar 2024 02:52

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Contributors

Author: B.H. Ni
Author: C. Lee
Author: R.C. Sun
Author: X.L. Zhang ORCID iD

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