STRUCTURAL DETERMINATION OF SURFACE RHENIUM OXIDE ON VARIOUS OXIDE SUPPORTS (AL2O3, ZRO2, TIO2 AND SIO2)

被引:120
作者
VUURMAN, MA
STUFKENS, DJ
OSKAM, A
WACHS, IE
机构
[1] LEHIGH UNIV,ZETTLEMOYER CTR SURFACE STUDIES,BETHLEHEM,PA 18015
[2] UNIV AMSTERDAM,ANORGAN CHEM LAB,1018 WV AMSTERDAM,NETHERLANDS
[3] LEHIGH UNIV,DEPT CHEM ENGN,BETHLEHEM,PA 18015
来源
JOURNAL OF MOLECULAR CATALYSIS | 1992年 / 76卷 / 1-3期
关键词
D O I
10.1016/0304-5102(92)80164-C
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
In the present investigation Raman and IR spectroscopy were used to determine the structure of Re2O7/Al2O3, Re2O7/ZrO2, Re2O7/TiO2 and Re2O7/SiO2 as a function of loading under ambient and in situ dehydrated conditions. Under ambient conditions, the surface rhenium oxide is hydrated and possesses the structure of the ReO4 ion in aqueous solution, independent of coverage or support type. Under dehydrated conditions, the in situ Raman and IR spectra show that only one surface rhenium oxide species is present on the silica support, whereas two surface rhenium oxide species are present on the alumina, zirconia and titania supports. The concentration ratio of the two species is a function of the coverage, and their structures are similar, possessing three terminal Re=O bonds and one bridging Re-0-support bond (C3v symmetry). Differences in properties between the surface rhenium oxide species were determined by TPR as a function of coverage and support type. The in situ Raman, IR and TPR measurements suggest that the bridging Re-0-support bond strength decreases with increasing coverage, while the TPR data further indicate that the Re-O-support bond strength decreases in the order Al2O3 > SiO2 almost-equal-to ZrO2 > TiO2 for a given rhenium oxide loading.
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页码:263 / 285
页数:23
相关论文
共 41 条
  • [1] ACTIVITY OF RE2O7/SIO2.AL2O3 CATALYSTS FOR PROPENE METATHESIS AND THE INFLUENCE OF ALKYLTIN PROMOTORS
    ANDREINI, A
    XU, XD
    MOL, JC
    [J]. APPLIED CATALYSIS, 1986, 27 (01): : 31 - 40
  • [2] TEMPERATURE-PROGRAMMED REDUCTION OF RE2O7/AL2O3 METATHESIS CATALYSTS - CALCULATION OF ACTIVATION PARAMETERS FOR REDUCTION
    ARNOLDY, P
    BRUINSMA, OSL
    MOULIJN, JA
    [J]. JOURNAL OF MOLECULAR CATALYSIS, 1985, 30 (1-2): : 111 - 123
  • [3] TEMPERATURE-PROGRAMMED REDUCTION OF AL2O3-, SIO2-, AND CARBON-SUPPORTED RE2O7 CATALYSTS
    ARNOLDY, P
    VANOERS, EM
    BRUINSMA, OSL
    DEBEER, VHJ
    MOULIJN, JA
    [J]. JOURNAL OF CATALYSIS, 1985, 93 (02) : 231 - 245
  • [4] Baes C. F., 1986, HYDROLYSIS CATIONS
  • [5] OXIDE PHONON SPECTRA
    BEATTIE, IR
    GILSON, TR
    [J]. JOURNAL OF THE CHEMICAL SOCIETY A -INORGANIC PHYSICAL THEORETICAL, 1969, (16): : 2322 - &
  • [6] VIBRATIONAL SPECTRUM OF GASEOUS, LIQUID, AND SOLID RE2O7
    BEATTIE, IR
    OZIN, GA
    [J]. JOURNAL OF THE CHEMICAL SOCIETY A -INORGANIC PHYSICAL THEORETICAL, 1969, (17): : 2615 - &
  • [7] BEATTIE IR, 1972, J CHEM SOC DA, P1481
  • [8] Boehm H-P, 1983, CATALYSIS SCI TECHNO, P39, DOI DOI 10.1007/978-3-642-93229-8_2
  • [9] THE CHEMISTRY OF COORDINATED PERRHENATE (REO4-
    CHAKRAVORTI, MC
    [J]. COORDINATION CHEMISTRY REVIEWS, 1990, 106 : 205 - 225
  • [10] INSITU LASER RAMAN-SPECTROSCOPY OF SUPPORTED METAL-OXIDES
    CHAN, SS
    WACHS, IE
    MURRELL, LL
    WANG, L
    HALL, WK
    [J]. JOURNAL OF PHYSICAL CHEMISTRY, 1984, 88 (24) : 5831 - 5835