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题名: Surface sites of alumina-supported molybdenum nitride characterized by FTIR, TPD-MS, and volumetric chemisorption
作者: Yang, SW;  Li, C;  Xu, J;  Xin, Q
刊名: JOURNAL OF PHYSICAL CHEMISTRY B
发表日期: 1998-09-03
卷: 102, 期:36, 页:6986-6993
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 state and active sites of a fresh Mo2N/Al2O3 were investigated by FTIR, volumetric chemisorption, and TPD-MS techniques. It has been found that adsorption properties of CO on the fresh sample are quite different from those of the reduced passivated one. For reduced passivated Mo2N/Al2O3, the IR spectrum of adsorbed CO shows that a band at similar to 2180 cm(-1) together with two weak bands at 2100 and 2035 cm(-1) appear, suggesting that the Mo4+ cation is predominant on the surface; namely, the surface is in oxynitride form. However, for the fresh sample, adsorbed CO gives two characteristic IR bands at 2035 and 2200 cm(-1) respectively, corresponding to the adsorbed CO on the molybdenum and the nitrogen sites, forming linearly adsorbed CO and NCO species. From the band position of adsorbed CO, the surface molybdenum atoms are slightly positively charged, i.e., in a state of Mod(delta+)(0 < 6 < 2). The assignment of the band at 2200 cm(-1) to NCO species (CO adsorbed on N site) was further confirmed by TPD-MS and volumetric chemisorption. TPD-MS shows two CO desorption peaks at 373 and ca. 473 K, indicating two different CO adsorption sites on the catalyst. The volumetric chemisorption proves that the CO uptake increases significantly when the passivated sample is nitrided at 723 K and above, compared with the case of the reduced sample. These results suggest that not only Mo sites in low valences are present on the surface of fresh Mo nitride, but also nitrogen sites are present and so active that can react with CO to form surface NCO species.
关键词[WOS]: CARBON-MONOXIDE ;  ADSORBED CARBON ;  CATALYSTS ;  CO ;  HYDRODENITROGENATION ;  ADSORPTION ;  REDUCTION ;  HYDRODESULFURIZATION ;  SPECTROSCOPY ;  GAMMA-MO2N
语种: 英语
WOS记录号: WOS:000075916100007
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138493
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:
Yang, SW,Li, C,Xu, J,et al. Surface sites of alumina-supported molybdenum nitride characterized by FTIR, TPD-MS, and volumetric chemisorption[J]. JOURNAL OF PHYSICAL CHEMISTRY B,1998,102(36):6986-6993.
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