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In situ FT-IR spectroscopic studies of CO adsorption on fresh Mo2C/Al2O3 catalyst
Wu, WC; Wu, ZL; Liang, CH; Chen, XW; Ying, PL; Li, C
Source PublicationJOURNAL OF PHYSICAL CHEMISTRY B
2003-07-24
DOI10.1021/jp027582m
Volume107Issue:29Pages:7088-7094
Indexed BySCI
SubtypeArticle
Department503
Funding Project503
Contribution Rank1;1
WOS HeadingsScience & Technology ; Physical Sciences
WOS SubjectChemistry, Physical
WOS Research AreaChemistry
WOS KeywordMOLYBDENUM CARBIDE CATALYSTS ; CARBON-MONOXIDE ; INFRARED-SPECTROSCOPY ; TUNGSTEN CARBIDES ; ATR-IR ; SURFACE ; METHANE ; ALUMINA ; NITRIDE ; NO
AbstractThe 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.
Language英语
URL查看原文
WOS IDWOS:000184242600024
Citation statistics
Cited Times:57[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/82927
Collection中国科学院大连化学物理研究所
AffiliationChinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
Recommended Citation
GB/T 7714
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.
APA Wu, WC,Wu, ZL,Liang, CH,Chen, XW,Ying, PL,&Li, C.(2003).In situ FT-IR spectroscopic studies of CO adsorption on fresh Mo2C/Al2O3 catalyst.JOURNAL OF PHYSICAL CHEMISTRY B,107(29),7088-7094.
MLA Wu, WC,et al."In situ FT-IR spectroscopic studies of CO adsorption on fresh Mo2C/Al2O3 catalyst".JOURNAL OF PHYSICAL CHEMISTRY B 107.29(2003):7088-7094.
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