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Basic sites on the surface of oxide catalysts responsible for oxidative methane coupling
Author(s) -
Davydov Anatolii Aleksandrovich
Publication year - 1995
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.270180103
Subject(s) - oxidative coupling of methane , catalysis , methane , chemistry , oxide , adsorption , oxygen , chloroform , fourier transform infrared spectroscopy , inorganic chemistry , oxidative phosphorylation , chemical engineering , organic chemistry , biochemistry , engineering
The basic sites of various oxide catalysts for the oxidative dimerisation of methane were studied by FTIR spectroscopy of adsorbed molecular probes (chloroform and CO 2 ). The methods used are compared and the advantage of CO 2 as probe for specifying the basic sites is demonstrated. The strengths of the basic sites were seen to correlate with the spectral parameters of the surface carbonates. Differences in spectral responses of carbonates are attributed to the different states of oxygen participating in their formation. The concentration of the strongest sites was estimated. A study of the catalytic activity of this system indicates that the system's activity in oxidative methane coupling depends on the presence and concentration of strong basic sites on the catalyst surface.