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dc.contributor.authorChen, DH
dc.contributor.authorCai, JX
dc.contributor.authorLiao, YY
dc.contributor.authorWan, HL
dc.contributor.author万惠霖
dc.date.accessioned2012-08-10T01:19:53Z
dc.date.available2012-08-10T01:19:53Z
dc.date.issued1997
dc.identifier.citationCHEMICAL RESEARCH IN CHINESE UNIVERSITIES,1997,13(3):249-255zh_CN
dc.identifier.issn1005-9040
dc.identifier.urihttps://dspace.xmu.edu.cn/handle/2288/13455
dc.description.abstractThe adsorption of O-2 over defective La2O3-based OCM catalysts with anionic vacancies, and the reaction of surface oxygen species with CH4 were studied by means of in situ confocal microprobe Raman spectra. The partially reduced oxygen species O-2(-), O-2(2-), O-2(delta-)(0<delta<1) and even the lattice oxygen ion O2- can be detected on the surface of O-2-pretreated La2O3-based catalysts. At lower temperatures (< 573 K) it is peroxide species O-2(2-) or O- that is more essential for the coupling of methane, while at higher temperatures the superoxide O-2(-) and lattice oxygen species O2- are rather important. It is easier for fluoride-containing La2O3-based catalysts to induce the oxygen species with fewer negative charges and the basicity of the catalyst surface is weakened, so that the C-2 selectivity for OCM reaction is improved.zh_CN
dc.language.isozhzh_CN
dc.publisherHIGHER EDUCATION PRESSzh_CN
dc.subjectmethane oxidative couplingzh_CN
dc.subjectoxygen adspecieszh_CN
dc.subjectdefective La2O3-based catalystzh_CN
dc.subjectin situ confocal microprobe Raman spectrazh_CN
dc.titleIn situ confocal microprobe Raman spectroscopic studies on defective La-based complex oxideszh_CN
dc.typeArticlezh_CN


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