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题名: On the surface sites Of MOP/SiO2 catalyst under sulfiding conditions: IR spectroscopy and catalytic reactivity studies
作者: Wu, ZL;  Sun, FX;  Wu, WC;  Feng, ZC;  Liang, CH;  Wei, ZB;  Li, C
关键词: molybdenum phosphide ;  catalyst ;  sulfur ;  hydrodesulfurization ;  IR spectroscopy ;  CO ;  adsorption
刊名: JOURNAL OF CATALYSIS
发表日期: 2004-02-15
DOI: 10.1016/j.jcat.2003.10.019
卷: 222, 期:1, 页:41-52
收录类别: SCI
文章类型: Article
项目归属: 503
产权排名: 1;1
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: The surface sites of MoP/SiO2 catalysts and their evolution under sulfiding conditions were characterized by IR spectroscopy using CO as the probe molecule. The HDS activities of thiophene were measured on the MoP/SiO2 catalyst that was subjected to different sulfidation and reactivation pretreatments. Cus Modelta+ (0 < delta less than or equal to 2) sites are probed on the surface of fresh MoP/SiO2 by molecularly adsorbed CO, exhibiting a characteristic IR band at 2045 cm(-1). The surface of MoP/SiO2 is gradually sulfided in HDS reactions, as revealed by the shift of the IR band at 2045 to ca. 2100 cm(-1). Although the surface of a MoP/SiO2 catalyst becomes partially sulfided, the HDS activity tests show that MoP/SiO2 is fairly stable in the initial stage of the HDS reaction, providing further evidence that molybdenum phosphide is a promising catalytic material for industrial HDS reactions. Two kinds of surface sulfur species are formed on the sulfided catalyst: reversibly and irreversibly bonded sulfur species. The MoP/SiO2 catalyst remains stable in the HDS of thiophene because most sulfur species formed under HDS conditions are reversibly bonded on the catalyst surface. A detrimental effect of presulfidation on the HDS activity is observed for the MoP/SiO2 catalyst treated by H2S/H-2 at temperatures higher than 623 K, which is ascribed to the formation of a large amount of the irreversibly bonded sulfur species. The irreversibly sulfided catalyst can be completely regenerated by an oxidation and a subsequent reduction under mild conditions. (C) 2003 Elsevier Inc. All rights reserved.
关键词[WOS]: TRANSITION-METAL PHOSPHIDES ;  MAGNETIC-RESONANCE SPECTROSCOPY ;  SUPPORTED MOLYBDENUM CARBIDE ;  TUNGSTEN PHOSPHIDE ;  FT-IR ;  THIOPHENE HYDRODESULFURIZATION ;  HYDROPROCESSING CATALYSTS ;  NITRIDE CATALYSTS ;  ALUMINA CATALYST ;  CARBON-MONOXIDE
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000188943200005
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/82657
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:
Wu, ZL,Sun, FX,Wu, WC,et al. On the surface sites Of MOP/SiO2 catalyst under sulfiding conditions: IR spectroscopy and catalytic reactivity studies[J]. JOURNAL OF CATALYSIS,2004,222(1):41-52.
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