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题名: UV resonance Raman spectroscopic studies on the genesis of highly dispersed surface molybdate species on gamma-alumina
作者: Xiong, G;  Feng, ZC;  Li, J;  Yang, QH;  Ying, PL;  Xin, Q;  Li, C
刊名: JOURNAL OF PHYSICAL CHEMISTRY B
发表日期: 2000-04-20
卷: 104, 期:15, 页:3581-3588
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: The surface molybdate species and their coordination structures on gamma-alumina are characterized by UV resonance Raman spectroscopy and UV-vis diffuse reflectance spectroscopy. The surface tetrahedral and octahedral molybdate species can be definitely identified on the basis of the resonance Raman effect. The evolution of surface species has been studied during the catalyst preparation under various conditions including the pH value of the impregnating solution and the pretreatment temperature. It is shown that the coordination structures of the supported molybdate in the wet state are dependent on the structures of molybdate in the impregnation solution as well as the surface property of gamma-alumina. When the impregnating solution is at pH = 10.0, only tetrahedral molybdate species are formed on gamma-alumina, while both tetrahedral and octahedral species are formed on gamma-alumina at pH = 3.0, although the molybdate is in only the octahedral form in the impregnation solution at pH = 3.0. For the samples prepared by the impregnating solution of (NH4)(6)Mo7O24, some surface tetrahedral molybdate species polymerize to the octahedral species during calcination even when the loading of molybdate is extremely low. However, the surface molybdate species hardly aggregate into the octahedral species when the sample prepared by the impregnating solution of Na2MoO4. It turns out that the "surface pH value" (i.e., the pH value of surface region) is a key factor governing the coordination structure of the surface molybdate species.
关键词[WOS]: SUPPORTED MOLYBDENUM OXIDE ;  PARTIAL OXIDATION ;  PHYSICOCHEMICAL CHARACTERIZATION ;  HYDRODESULFURIZATION CATALYSTS ;  INFRARED-SPECTROSCOPY ;  MOO3/SIO2 CATALYSTS ;  SILICON DIOXIDE ;  COKE FORMATION ;  SPECTRA ;  REFLECTANCE
语种: 英语
WOS记录号: WOS:000086655600030
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138733
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Xiong, G,Feng, ZC,Li, J,et al. UV resonance Raman spectroscopic studies on the genesis of highly dispersed surface molybdate species on gamma-alumina[J]. JOURNAL OF PHYSICAL CHEMISTRY B,2000,104(15):3581-3588.
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