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Surface Properties of CaO (or BaO)–La2O3–MgO Catalysts and Their Performance in Oxidative Coupling of Methane
Author(s) -
Choudhary Vasant R.,
Rane Vilas H.
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(199705)69:1<63::aid-jctb663>3.0.co;2-a
Subject(s) - catalysis , selectivity , oxidative coupling of methane , space velocity , chemistry , methane , inorganic chemistry , lanthanum oxide , organic chemistry
CaO–La 2 O 3 –MgO and BaO–La 2 O 3 –MgO catalysts with different compositions have been studied for their bulk and surface properties (viz. crystal phases, surface area, acidity/acid strength distribution, basicity/base strength distribution, etc.) and catalytic activity/selectivity in the oxidative coupling of methane (OCM) at different processing conditions (reaction temperature, 700–850°C; CH 4 /O 2 ratio in feed, 3·0, 4·0 and 8·0 and GHSV, 102000 and 204000 cm 3 g −1 h −1 ). The surface acidity and strong basicity of La 2 O 3 –MgO are found to be increased due to the addition of a third component (CaO or BaO), depending upon its concentration in the catalyst. The addition of CaO or BaO to La 2 O 3 –MgO OCM catalyst causes a significant improvement in its performance. Both the CaO‐ and BaO‐containing catalysts show a high activity and selectivity at 800°C, whereas, the activity and selectivity of BaO‐containing catalysts at 700°C is lower than that of CaO‐containing catalysts. © 1997 SCI.