AN INFRARED-SPECTROSCOPY AND TEMPERATURE-PROGRAMMED DESORPTION STUDY OF CO ON MOO3/AL2O3 CATALYSTS - QUANTITATION OF THE MOLYBDENA OVERLAYER

被引：70
作者：
DIAZ, AL [1 ]
BUSSELL, ME [1 ]
机构：
[1] WESTERN WASHINGTON STATE UNIV,DEPT CHEM,MS 9058,BELLINGHAM,WA 98225
来源：
JOURNAL OF PHYSICAL CHEMISTRY | 1993年 / 97卷 / 02期
关键词：
D O I：
10.1021/j100104a032
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The adsorption of CO on pure gamma-Al2O3 and a series Of MoO3/Al2O3 catalysts with different Mo loading has been investigated using infrared (IR) spectroscopy and temperature-programmed desorption (TPD). Carbon monoxide adsorbs selectively on Al3+ sites on the uncovered, free alumina portion of the surface; these sites are created by dehydroxylation of the alumina. As the Mo loading is increased, the CO adsorption capacity of the catalysts decreases in a linear fashion as the MoO3 overlayer covers an increasing fraction of the alumina support. Overlayer growth saturates at a loading of (42 +/- 3) x 10(13) Mo atoms/cm2 and corresponds to less than a complete monolayer as 14 +/- 5% of the alumina support remains uncovered. Extrapolation of the overlayer growth curve to ''monolayer'' coverage allows calculation of a MoO3 cross-sectional area of approximately 22 angstrom2, in good agreement with values predicted by theoretical models.
引用
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页码：470 / 477
页数：8
相关论文
共 36 条
  • [1] IR-SPECTROSCOPIC DETECTION OF LEWIS ACID SITES ON AL2O3 USING ADSORBED CO - CORRELATION WITH AL-OH GROUP REMOVAL
    BALLINGER, TH
    YATES, JT
    [J]. LANGMUIR, 1991, 7 (12) : 3041 - 3045
  • [2] TRANSMISSION INFRARED-SPECTROSCOPY OF HIGH AREA SOLID-SURFACES - A USEFUL METHOD FOR SAMPLE PREPARATION
    BALLINGER, TH
    WONG, JCS
    YATES, JT
    [J]. LANGMUIR, 1992, 8 (06) : 1676 - 1678
  • [3] WIDE TEMPERATURE-RANGE IR SPECTROSCOPY CELL FOR STUDIES OF ADSORPTION AND DESORPTION ON HIGH AREA SOLIDS
    BASU, P
    BALLINGER, TH
    YATES, JT
    [J]. REVIEW OF SCIENTIFIC INSTRUMENTS, 1988, 59 (08) : 1321 - 1327
  • [4] Bell A.T., 1987, VIBRATIONAL SPECTROS, P105, DOI [10.1007/978-1-4684-8759-6, DOI 10.1007/978-1-4684-8759-6]
  • [5] A METHOD FOR MEASURING THE TITANIA SURFACE-AREA ON MIXED OXIDES OF TITANIA AND SILICA
    BIAGLOW, AI
    GORTE, RJ
    SRINIVASAN, S
    DATYE, AK
    [J]. CATALYSIS LETTERS, 1992, 13 (04) : 313 - 321
  • [6] STUDIES OF THE HYDROGEN HELD BY SOLIDS .26. PROTON-RESONANCE FROM ALUMINA AND MOLYBDENA-ALUMINA CATALYSTS
    CIRILLO, AC
    DOLLISH, FR
    HALL, WK
    [J]. JOURNAL OF CATALYSIS, 1980, 62 (02) : 379 - 388
  • [7] APPLICATION OF FTIR SPECTROSCOPY TO THE STUDY OF SULFIDATION OF MO CATALYSTS SUPPORTED ON ALUMINA OR SILICA (4000-400CM-1 RANGE)
    CORNAC, M
    JANIN, A
    LAVALLEY, JC
    [J]. INFRARED PHYSICS, 1984, 24 (2-3): : 143 - 150
  • [8] DEBEER VHJ, 1976, J CATAL, V43, P78
  • [9] DELLAGATTA G, 1976, J CATAL, V43, P90
  • [10] STUDY OF NI-MO-GAMMA-AL2O3 CATALYSTS BY X-RAY PHOTOELECTRON AND RAMAN-SPECTROSCOPY - COMPARISON WITH CO-MO-GAMMA-AL2O3 CATALYSTS
    DUFRESNE, P
    PAYEN, E
    GRIMBLOT, J
    BONNELLE, JP
    [J]. JOURNAL OF PHYSICAL CHEMISTRY, 1981, 85 (16) : 2344 - 2351
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