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Oxidative coupling of methane and oxidative dehydrogenation of ethane over strontium‐promoted rare earth oxide catalysts
Author(s) -
Choudhary Vasant R.,
Mulla Shafeek A. R.,
Rane Vilas H.
Publication year - 1998
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(199802)71:2<167::aid-jctb789>3.0.co;2-f
Subject(s) - dehydrogenation , oxidative coupling of methane , rare earth , methane , catalysis , strontium , oxidative phosphorylation , strontium oxide , chemistry , alkaline earth metal , oxide , inorganic chemistry , photochemistry , organic chemistry , metal , mineralogy , biochemistry
Sr‐promoted rare earth (viz. La, Ce, Pr, Nd, Sm, Eu, Gd, Dy, Er and Yb) oxide catalysts (Sr/rare earth ratio = 0·1) are compared for their performance in the oxidative coupling of methane (OCM) to C 2 hydrocarbons and oxidative dehydrogenation of ethane (ODE) to ethylene at different temperatures (700 and 800°C) and CH 4 (or C 2 H 6 )/O 2 ratios (4–8), at low contact time (space velocity = 102000 cm 3 g −1 h −1 ). For the OCM process, the Sr–La 2 O 3 catalyst shows the best performance. The Sr‐promoted Nd 2 O 3 , Sm 2 O 3 , Eu 2 O 3 and Er 2 O 3 catalysts also show good methane conversion and selectivity for C 2 hydrocarbons but the Sr–CeO 2 and Sr–Dy 2 O 3 catalysts show very poor performance. However, for the ODE process, the best performance is shown by the Sr–Nd 2 O 3 catalyst. The other catalysts also show good ethane conversion and selectivity for ethylene; their performance is comparable at higher temperatures (≥800°C), but at lower temperature (700°C) the Sr–CeO 2 and Sr–Pr 6 O 11 catalysts show poor selectivity. © 1998 SCI.