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An IR study on the surface passivation of Mo2C/Al2O3 catalyst with O-2, H2O and CO2
Wu, WC; Wu, ZL; Liang, CH; Ying, PL; Feng, ZC; Li, C
Source PublicationPHYSICAL CHEMISTRY CHEMICAL PHYSICS
2004
DOI10.1039/b411849a
Volume6Issue:24Pages:5603-5608
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
WOS SubjectChemistry, Physical ; Physics, Atomic, Molecular & Chemical
WOS Research AreaChemistry ; Physics
WOS KeywordMOLYBDENUM CARBIDE CATALYSTS ; ADSORPTION ; METHANE ; NITRIDE ; ALUMINA ; BENZENE ; MO2C ; NO ; HYDRODESULFURIZATION ; DEHYDROGENATION
AbstractThe surface active sites of a fresh Mo2C/Al2O3 catalyst and their evolution under passivation conditions were characterized by IR spectroscopy using CO as the probe molecule. It was found that adsorption properties of CO on the fresh sample were quite different from those of the reduced passivated one. Modelta+ (0 < δ < 2) sites are mainly present on fresh Mo2C/Al2O3 catalyst as probed by a characteristic IR band at 2054 cm(-1) of adsorbed CO. When the fresh Mo2C/Al2O3 catalyst in the IR cell is exposed to trace amounts of O-2 or H2O in situ at RT, the intensity of the 2075 cm(-1) band declines. It shows that the fresh Mo2C/Al2O3 catalyst can be oxidized by trace amounts of O-2 or H2O easily and the oxidation capacity of H2O is weaker than that of O-2. IR spectra of adsorbed CO on a reduced Mo2C/Al2O3 catalyst passivated by a 1% O-2/N-2 mixture show that two weak bands at 2180 and 2095 cm(-1) appear, which suggests that the passivation layer cannot be completely reduced, even by H-2-reduction at high temperatures. For reduced Mo2C/Al2O3 passivated by H2O or CO2, IR spectra of adsorbed CO give characteristic IR bands at 2081 and 2030 cm(-1), which indicates that the surface Mo atoms are in a state of Mo-phi1 (0 < φ < 3). Thus, we found that the Mo2C/Al2O3 passivated by H2O or CO2 can be regenerated by H-2 treatment at 673 K and most of the active sites can be recovered. It is too active to control the passivation extent using O-2 as an oxidant, while Mo2C/Al2O3 passivated by H2O or CO2 can be regenerated by simple reduction with H-2.
Language英语
WOS IDWOS:000225573600022
Citation statistics
Cited Times:24[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/138417
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. An IR study on the surface passivation of Mo2C/Al2O3 catalyst with O-2, H2O and CO2[J]. PHYSICAL CHEMISTRY CHEMICAL PHYSICS,2004,6(24):5603-5608.
APA Wu, WC,Wu, ZL,Liang, CH,Ying, PL,Feng, ZC,&Li, C.(2004).An IR study on the surface passivation of Mo2C/Al2O3 catalyst with O-2, H2O and CO2.PHYSICAL CHEMISTRY CHEMICAL PHYSICS,6(24),5603-5608.
MLA Wu, WC,et al."An IR study on the surface passivation of Mo2C/Al2O3 catalyst with O-2, H2O and CO2".PHYSICAL CHEMISTRY CHEMICAL PHYSICS 6.24(2004):5603-5608.
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