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题名: In situ IR spectroscopic studies on molybdenum nitride catalysts: active sites and surface reactions
作者: Wu, ZL;  Yang, SW;  Xin, Q;  Li, C
关键词: IR ;  Mo2N/gamma-Al2O3 ;  surface sites ;  surface reactions
刊名: CATALYSIS SURVEYS FROM ASIA
发表日期: 2003-09-01
卷: 7, 期:2-3, 页:103-119
收录类别: SCI
文章类型: Article
部门归属: 503
项目归属: 503
产权排名: 1;1
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: Recent IR spectroscopic studies on the surface properties of fresh Mo2N/gamma-Al2O3 catalyst are presented in this paper. The surface sites of fresh Mo2N/gamma-Al2O3, both Modelta+ (0<δ<2) and N sites, are probed by CO adsorption. Two characteristic IR bands were observed at 2045 and 2200 cm(-1), due to linearly adsorbed CO on Mo and N sites, respectively. The surface N sites are highly reactive and can react with adsorbed CO to form NCO species. Unlike adsorbed CO on reduced passivated one, the adsorbed CO on fresh Mo2N/gamma-Al2O3 behaves similarly to that of group VIII metals, suggesting that fresh nitride resembles noble metals. It is found that the surface of Mo nitrides slowly transformed into sulfide under hydrotreating conditions, which could be the main reason for the activity drop of molybdenum nitride catalysts in the presence of sulfur-containing species. Some surface reactions, such as selective hydrogenation of 1,3-butadiene, isomerization of 1-butene, and hydrodesulfurization of thiophene, were studied on both fresh and reduced passivated Mo2N/gammaAl(2)O(3) catalysts using IR spectroscopy. The mechanisms of these reactions are proposed. The adsorption and reaction behaviors of these molecules on fresh molybdenum nitride also resemble those on noble metals, manifesting the unique properties of fresh molybdenum nitride catalysts. Mo and N sites are found to play different roles in the adsorption and catalytic reactions on the fresh Mo2N/gammaAl(2)O(3) catalyst. Generally, Mo sites are the main active sites for the adsorption and reactions of adsorbates; N sites are not directly involved in catalytic reactions but they modify the electronic properties of Mo sites.
关键词[WOS]: TEMPERATURE-PROGRAMMED DESORPTION ;  TRANSITION-METAL PHOSPHIDES ;  FREQUENCY GENERATION SFG ;  NO-CO REACTION ;  FT-IR ;  THIOPHENE HYDRODESULFURIZATION ;  MO2N/GAMMA-AL2O3 CATALYST ;  HYDRAZINE DECOMPOSITION ;  ADSORPTION EQUILIBRIUM ;  INFRARED-SPECTROSCOPY
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000184812500001
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/82909
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,Yang, SW,Xin, Q,et al. In situ IR spectroscopic studies on molybdenum nitride catalysts: active sites and surface reactions[J]. CATALYSIS SURVEYS FROM ASIA,2003,7(2-3):103-119.
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