Precursor dependence of the nature and structure of non-stoichiometric magnesium aluminium vanadates

被引:34
作者
Kooli, F
Crespo, I
Barriga, C
Ulibarri, MA
Rives, V
机构
[1] UNIV SALAMANCA, FAC FARM, DEPT QUIM INORGAN, E-37007 SALAMANCA, SPAIN
[2] UNIV CORDOBA, FAC CIENCIAS, DEPT QUIM INORGAN & INGN QUIM, E-14004 CORDOBA, SPAIN
关键词
D O I
10.1039/jm9960601199
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
Hydrotalcite-like compounds containing (a) Mg-II; Al-III and V-III in the layers and carbonate in the interlayers, or (b) Mg-II and Al-III in the layers and decavanadate in the interlayers, have been synthesized and characterized using powder X-ray diffraction, thermal analysis, FTIR spectroscopy, temperature-programmed reduction, and specific surface-area determination. The crystalline phases formed after calcination in air at 700 degrees C have been identified using these same experimental techniques. It has been found that the nature of the precursor determines the nature of the Mg-V-O phases formed; thus, when starting from (a), Mg-3(VO4)(2) containing isolated [VO4] units is formed, while when starting from (b), MgV2O6, containing pairs of edge-sharing [VO6] octahedra, is formed preferentially. Such a reactivity appears to depend on the nature of the support, and not on the stoichiometry (i.e., Mg/V atomic ratio) of the starting materials.
引用
收藏
页码:1199 / 1206
页数:8
相关论文
共 56 条
  • [1] ALLMANN R, 1970, CHIMIA, V24, P99
  • [2] BARRIGA C, 1995, IN PRESS P ACS M AN
  • [3] BRINDLEY GW, 1979, AM MINERAL, V64, P836
  • [4] HYDROTALCITE-TYPE ANIONIC CLAYS: PREPARATION, PROPERTIES AND APPLICATIONS
    Cavani, F.
    Trifiro, F.
    Vaccari, A.
    [J]. CATALYSIS TODAY, 1991, 11 (02) : 173 - 301
  • [5] SELECTIVE OXIDATIVE DEHYDROGENATION OF BUTANE OVER V-MG-O CATALYSTS
    CHAAR, MA
    PATEL, D
    KUNG, MC
    KUNG, HH
    [J]. JOURNAL OF CATALYSIS, 1987, 105 (02) : 483 - 498
  • [6] STUDY OF MGO-V-2O-5 SYSTEM
    CLARK, GM
    MORLEY, R
    [J]. JOURNAL OF SOLID STATE CHEMISTRY, 1976, 16 (3-4) : 429 - 435
  • [7] PREPARATION AND THERMAL REACTIVITY OF NICKEL CHROMIUM AND NICKEL ALUMINUM HYDROTALCITE-TYPE PRECURSORS
    CLAUSE, O
    GAZZANO, M
    TRIFIRO, F
    VACCARI, A
    ZATORSKI, L
    [J]. APPLIED CATALYSIS, 1991, 73 (02): : 217 - 236
  • [8] CORMA A, 1992, STUD SURF SCI CATAL, V72, P213
  • [9] PREPARATION OF V-MG-O CATALYSTS - NATURE OF ACTIVE SPECIES PRECURSORS
    CORMA, A
    NIETO, JML
    PAREDES, N
    [J]. APPLIED CATALYSIS A-GENERAL, 1993, 104 (02) : 161 - 174
  • [10] OXIDATIVE DEHYDROGENATION OF PROPANE ON VANADIUM SUPPORTED ON MAGNESIUM SILICATES
    CORMA, A
    NIETO, JML
    PAREDES, N
    PEREZ, M
    [J]. APPLIED CATALYSIS A-GENERAL, 1993, 97 (02) : 159 - 175