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题名: In situ FT-IR spectroscopic studies of CO adsorption on fresh Mo2C/Al2O3 catalyst
作者: Wu, WC;  Wu, ZL;  Liang, CH;  Chen, XW;  Ying, PL;  Li, C
刊名: JOURNAL OF PHYSICAL CHEMISTRY B
发表日期: 2003-07-24
DOI: 10.1021/jp027582m
卷: 107, 期:29, 页:7088-7094
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: The surface sites of supported molybdenum carbide catalyst derived from different synthesis stages have been studied by in situ FT-IR spectroscopy using CO as the probe molecule. Adsorbed CO on the reduced passivated Mo2C/Al2O3 catalyst gives a main band at 2180 cm(-1), which can be assigned to linearly adsorbed CO on Mo4+ sites. The IR results show that the surface of reduced passivated sample is dominated by molybdenum oxycarbide. However, a characteristic IR band at 2054 cm-1 was observed for the adsorbed CO on MoO3/Al2O3 carburized with CH4/H-2 mixture at 1033 K (fresh Mo2C/Al2O3), which can be assigned to linearly adsorbed CO on Modelta+ (0 < delta < 2) sites Of Mo2C/Al2O3, Unlike adsorbed CO on reduced passivated Mo2C/Al2O3 catalyst, the IR spectra of adsorbed CO on fresh Mo2C/Al2O3 shows similarity to that on some of the group VIII metals (such as Pt and Pd), suggesting that fresh carbide resembles noble metals. To study the stability Of Mo2C catalyst during H-2 treatment and find proper conditions to remove the deposited carbon species, H-2 treatment of fresh Mo2C/Al2O3 catalyst at different temperatures was conducted. Partial amounts of carbon atoms in Mo2C along with some surface-deposited carbon species can be removed by the H, treatment even at 450 K. Both the surface-deposited carbon species and carbon atoms in carbide can be extensively removed at temperatures above 873 K.
关键词[WOS]: MOLYBDENUM CARBIDE CATALYSTS ;  CARBON-MONOXIDE ;  INFRARED-SPECTROSCOPY ;  TUNGSTEN CARBIDES ;  ATR-IR ;  SURFACE ;  METHANE ;  ALUMINA ;  NITRIDE ;  NO
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000184242600024
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/82927
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, WC,Wu, ZL,Liang, CH,et al. In situ FT-IR spectroscopic studies of CO adsorption on fresh Mo2C/Al2O3 catalyst[J]. JOURNAL OF PHYSICAL CHEMISTRY B,2003,107(29):7088-7094.
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