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题名: Studies on characterization of sulfided tertiary NiMoP/gamma-Al2O3 catalysts by TPR technique and their thiophene HDS activity
作者: Qi, XY;  Xu, CM;  Liu, ZC;  Li, WZ;  Xin, Q
关键词: transition metal sulfides ;  TPR ;  HDS
刊名: CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE
发表日期: 2001-05-01
卷: 22, 期:5, 页:841-843
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Multidisciplinary
研究领域[WOS]: Chemistry
英文摘要: A series of sulfided tertiary NiMoP/gamma -Al2O3 catalysts with different contents of MoO3 were prepared by using molybdophosphoric acid of Keggin structure (H3PMO12O40) and nickel nitrate as origins of active phase components of molybdenum, phosphorus and nickel, and characterized by TPR technique, with their HDS activity being investigated with thiophene as a model substrate. For the sulfided Mo-O catalyst containing no nickel as promoter, the only hydrogen sulfide evolution peak I is observed at 462 K and attributed to the hydrogenation of the so-called edge sulfur atoms chemisorbed on coordinatively unsaturated(cus) Mox+ sites on the MoS2 phase(MoS2 slab). With the introduction of nickel into the active phase of the sulfided Mo-O catalyst and with the increase of the molybdenum loading, a new hydrogen sulfide evolution peak II gradually develops at the low temperature side of;he peak I, at the same time accompanied by both the increase of the area ratio of the peak II to the peak I and the shift of the hydrogen sulfide evolution maximum rate to lower temperatures, which may imply the existence of two kinds of active centers related to molybdenum and nickel respectively and the synergic action between the two centers above. It should be noted that for the sulfided NiMoP/gamma -Al2O3 catalysts, the thiophene HDS rate and the quantity of hydrogen sulfide evolved during TPR process increase monotonously with the atomic ratio of molybdenum to nickel in the form of [n(Ni)+n(Mo)]/n(Ni). On the basis of the results here, the conclusion may be reached that the two kinds of vacancies can be formed on the edge of Ni-Mo-S slab due to the loss of S during TPR process and vacancies or sites related to the H2S evolution peak II should be regarded as the mainly active reaction centers of thiophene I-IDS.
语种: 英语
WOS记录号: WOS:000168930400035
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/139010
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.Beijing Univ Aeronaut & Astronaut, Fac Mat Sci & Engn, Beijing 100083, Peoples R China
2.Univ Petr Beijing, Fac Chem Engn, Beijing 102200, Peoples R China
3.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China

Recommended Citation:
Qi, XY,Xu, CM,Liu, ZC,et al. Studies on characterization of sulfided tertiary NiMoP/gamma-Al2O3 catalysts by TPR technique and their thiophene HDS activity[J]. CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE,2001,22(5):841-843.
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