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- W1996894322 abstract "Abstract The catalytic performance evaluation results showed that the CH 4 conversion, C 2 selectivity and ethylene to ethane ratio were significantly higher over LaF 3 /SrO and SrF 2 /La 2 O 3 than those over SrO/La 2 O 3 and the maximum C 2 yields of 18–20% were achieved over the LaF 3 /SrO and SrF 2 /La 2 O 3 catalysts at 650–750°C. XRD analysis of the fresh catalysts indicated that, with the addition of LaF 3 to SrO and treatment in air at high temperature, anionic and/or cationic exchange between oxides and fluorides lattices took place to some extent, leading to the formation of SrF 2 and LaOF. The UV spectra of pyridine adsorption and the temperature-programmed desorption spectra of CO 2 adsorption on SrF 2 /La 2 O 3 and SrO/La 2 O 3 showed that surface of the catalyst containing fluoride was more acidic and less basic than that of the corresponding oxide system. The XPS characterizations of O 2 -adsorbed catalysts revealed that the catalysts containing F − were more conducive to the formation of the oxygen species with fewer negative charges. The results of in situ IR characterization of the surface oxygen species at 650°C suggested that O 2 − might be the active oxygen adspecies for the oxidative coupling of methane reaction." @default.
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- W1996894322 date "1995-12-01" @default.
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- W1996894322 title "Promoting effect of F− on Sr/La oxide catalysts for the oxidative coupling of methane" @default.
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