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Comparison of Alkali Metal Promoted MgO Catalysts for Their Surface Acidity/Basicity and Catalytic Activity/Selectivity in the Oxidative Coupling of Methane
Author(s) -
Choudhary Vasant R.,
Rane Vilas H.,
Pandit Meenakshi Y.
Publication year - 1997
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/(sici)1097-4660(199702)68:2<177::aid-jctb645>3.0.co;2-u
Subject(s) - catalysis , alkali metal , calcination , chemistry , oxidative coupling of methane , inorganic chemistry , selectivity , metal , methane , base (topology) , organic chemistry , mathematical analysis , mathematics
Alkali metal (viz. Li, Na, K, Rb and Cs) promoted MgO catalysts (with an alkali metal/Mg ratio of 0·1) calcined at 750°C have been compared for their surface properties (viz. surface area, morphology, acidity and acid strength distribution, basicity and base strength distribution, etc.) and catalytic activity/selectivity in the oxidative coupling of methane (OCM) to C 2 ‐hydrocarbons at different temperatures (700–750°C), CH 4 /O 2 ratios (4·0 and 8·0) in feed, and space velocities (10320 cm 3 g −1 h −1 ). The surface and catalytic properties of alkali metal promoted MgO catalysts are found to be strongly influenced by the alkali metal promoter and the calcination temperature of the catalysts. A close relationship between the surface density of strong basic sites and the rate of C 2 ‐hydrocarbons formation per unit surface area of the catalysts has been observed. Among the catalysts calcined at 750°C, the best performance in the OCM is shown by Li–MgO (at 750°C). © 1997 SCI.