ELECTRONIC INTERACTIONS IN THE VANADIUM/TIO2(110) AND VANADIA/TIO2(110) MODEL CATALYST SYSTEMS

被引:134
作者
ZHANG, ZM
HENRICH, VE
机构
[1] Surface Science Laboratory, Department of Applied Physics, Yale University, New Haven
关键词
D O I
10.1016/0039-6028(92)90767-Z
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
We have studied model catalysts comprised of vanadium or vanadia deposited onto both stoichiometric and reduced single-crystal TiO2(110) surfaces by using XPS, UPS, Auger, LEED and work-function measurements. Changes in the electronic and geometric structure of TiO2 supports are monitored during overlayer formation in the submonolayer and monolayer regimes. Deposition of vanadium in an O2 ambient onto the stoichiometric TiO2 surface results in the formation of lower oxides of vanadium that interact only weakly with the support. However, the stoichiometric TiO2 surface is attacked violently by vanadium metal atoms deposited in UHV; in the submonolayer range, V-O bonding results in electron transfer to the substrate due to the strong affinity between V and O. This substrate reduction is confirmed by the appearance of Ti3+ features in XPS spectra. For greater than monolayer coverage, a metallic overlayer is formed. In both the vanadia/TiO2 and V/TiO2 systems, the initially sharp (1 x 1) LEED patterns disappear for small coverages, indicating disordering of the surfaces. Although defects on TiO2 are generally active chemisorption sites, the reduced TiO2 surface interacts only weakly with metallic vanadium.
引用
收藏
页码:263 / 272
页数:10
相关论文
共 32 条
  • [1] SELECTIVE CATALYTIC REDUCTION OF NITRIC-OXIDE WITH AMMONIA .1. MONOLAYER AND MULTILAYERS OF VANADIA SUPPORTED ON TITANIA
    BAIKER, A
    DOLLENMEIER, P
    GLINSKI, M
    RELLER, A
    [J]. APPLIED CATALYSIS, 1987, 35 (02): : 351 - 364
  • [2] EFFECTS OF THE ACTIVE PHASE SUPPORT INTERACTION IN VANADIUM-OXIDE ON TIO2 CATALYSTS FOR ORTHO-XYLENE OXIDATION
    CENTI, G
    PINELLI, D
    TRIFIRO, F
    [J]. JOURNAL OF MOLECULAR CATALYSIS, 1990, 59 (02): : 221 - 231
  • [3] INTERACTIONS IN THE FE/TIO2(110) SYSTEM
    DENG, JZ
    WANG, DZ
    WEI, XM
    ZHAI, RS
    WANG, HL
    [J]. SURFACE SCIENCE, 1991, 249 (1-3) : 213 - 222
  • [4] Dicenzo S. B., 1985, Comments on Solid State Physics, V11, P203
  • [5] Goodenough J., 1971, PROG SOLID STATE CH, V5, P145, DOI DOI 10.1016/0079-6786(71)90018-5
  • [6] OBSERVATION OF 2-DIMENSIONAL PHASES ASSOCIATED WITH DEFECT STATES ON SURFACE OF TIO-2
    HENRICH, VE
    DRESSELHAUS, G
    ZEIGER, HJ
    [J]. PHYSICAL REVIEW LETTERS, 1976, 36 (22) : 1335 - 1339
  • [7] THE SURFACES OF METAL-OXIDES
    HENRICH, VE
    [J]. REPORTS ON PROGRESS IN PHYSICS, 1985, 48 (11) : 1481 - 1541
  • [8] HONIG RE, 1969, RCA REV, V30, P285
  • [9] XPS INVESTIGATIONS OF PT AND RH SUPPORTED ON GAMMA-AL2O3 AND TIO2
    HUIZINGA, T
    VANTBLIK, HFJ
    VIS, JC
    PRINS, R
    [J]. SURFACE SCIENCE, 1983, 135 (1-3) : 580 - 596
  • [10] ELECTRONIC-PROPERTIES, STRUCTURE AND TEMPERATURE-DEPENDENT COMPOSITION OF NICKEL DEPOSITED ON RUTILE TITANIUM-DIOXIDE (110) SURFACES
    KAO, CC
    TSAI, SC
    BAHL, MK
    CHUNG, YW
    LO, WJ
    [J]. SURFACE SCIENCE, 1980, 95 (01) : 1 - 14