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dc.contributor.authorLong, RQ
dc.contributor.authorZhou, SQ
dc.contributor.authorHuang, YP
dc.contributor.authorWeng, WZ
dc.contributor.author翁维正
dc.contributor.authorWan, HL
dc.contributor.author万惠霖
dc.contributor.authorTsai, KR
dc.contributor.author蔡启瑞
dc.date.accessioned2012-10-07T01:22:26Z
dc.date.available2012-10-07T01:22:26Z
dc.date.issued1995
dc.identifier.citationAPPLIED CATALYSIS A-GENERAL,1995,133(2):269-280zh_CN
dc.identifier.issn0926-860X
dc.identifier.urihttp://dx.doi.org/10.1016/0926-860X(95)00215-4
dc.identifier.urihttps://dspace.xmu.edu.cn/handle/2288/13687
dc.description.abstractThe catalytic performance evaluation results showed that the CH4 conversion, C-2 selectivity and ethylene to ethane ratio were significantly higher over LaF3/SrO and SrF2/La2O3 than those over SrO/La2O3 and the maximum C-2 yields of 18-20% were achieved over the LaF3/SrO and SrF2/La2O3 catalysts at 650-750 degrees C. XRD analysis of the fresh catalysts indicated that, with the addition of LaF3 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 SrF2 and LaOF. The UV spectra of pyridine adsorption and the temperature-programmed desorption spectra of CO2 adsorption on SrF2/La2O3 and SrO/La2O3 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 degrees C suggested that O-2(-) might be the active oxygen adspecies for the oxidative coupling of methane reaction.zh_CN
dc.language.isoenzh_CN
dc.publisherELSEVIER SCIENCE BVzh_CN
dc.subjectmethane oxidative couplingzh_CN
dc.subjectfluoridezh_CN
dc.subjectoxygen adspecieszh_CN
dc.subjectin situ IR spectrazh_CN
dc.titlePromoting effect of F- on Sr/La oxide catalysts for the oxidative coupling of methanezh_CN
dc.typeArticlezh_CN


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