Relevance of the basicity of MO–Sm2O3 (M = Zn, Mg, Ca, Sr) mixed oxides for the efficiency of methane conversion to C2+ hydrocarbons

Ioan Balint; Akane Miyazaki; Dana Gingasu; Florica Papa

doi:10.1007/s11144-011-0361-9

Reaction Kinetics, Mechanisms and Catalysis

Volume/Issue:: Volume 105: Issue 1

Relevance of the basicity of MO–Sm₂O₃ (M = Zn, Mg, Ca, Sr) mixed oxides for the efficiency of methane conversion to C₂⁺ hydrocarbons

Authors:

Ioan Balint

Ioan Balint Institute of Physical Chemistry of the Romanian Academy, Spl. Independentei 202, 060021, Bucharest, Romania

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Akane Miyazaki

Akane Miyazaki Department of Chemical and Biological Sciences, Faculty of Science, Japan Women's University, 2-8-1 Mejirodai, Bunkyo-ku, Tokyo 112-8681, Japan

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Dana Gingasu

Dana Gingasu Institute of Physical Chemistry of the Romanian Academy, Spl. Independentei 202, 060021, Bucharest, Romania

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, and

Florica Papa

Florica Papa Institute of Physical Chemistry of the Romanian Academy, Spl. Independentei 202, 060021, Bucharest, Romania

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Pages:: 5–11

Online Publication Date:: 20 Aug 2011

Publication Date:: 01 Feb 2012

Article Category:: Research Article

DOI:: https://doi.org/10.1007/s11144-011-0361-9

Keywords:: Oxide surface basicity; Oxidative coupling of methane; Lanthanide-alkaline-earth oxides catalysts

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Abstract

This article focuses on the catalytic behavior of MO–Sm₂O₃ (M = Zn, Mg, Ca, Sr) mixed oxides. The obtained results could be interpreted in terms of solid acid–base catalysis. The mixed oxides were prepared starting from the tartarate complexes of the constituent metals. The concentration as well as the evolution of surface carbonate species with the nature of MO and reaction temperature were analyzed by XRD and TPD methods. The amount of surface basic sites responsible for the formation of C₂⁺ was determined by measuring the amount of evolved CO₂ in the 300–800 °C temperature range. The catalytic behavior of the investigated mixed oxides was expressed in terms of methane yield to C₂⁺ and the concentration of CO₂ in reaction mixture. The conclusion is that C₂⁺ is formed on the basic sites whereas the acidic sites are responsible for nonselective oxidation of methane to CO₂.

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Reaction Kinetics, Mechanisms and Catalysis

Print ISSN:: 1878-5190

Online ISSN:: 1878-5204

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Reaction Kinetics, Mechanisms and Catalysis
Language	English
Size	B5
Year of Foundation	1974
Volumes per Year	1
Issues per Year	6
Founder	Akadémiai Kiadó
Founder's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher	Akadémiai Kiadó Springer Nature Switzerland AG
Publisher's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11.
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ISSN	1878-5190 (Print)
ISSN	1878-5204 (Online)