Two desorption components of product CO2 in steady-state CO oxidation on Pd(110)

被引:0
作者
Moula, MG [1 ]
Wako, S
Cao, GY
Kimura, K
Ohno, Y
Kobal, I
Matsushima, T
机构
[1] Hokkaido Univ, Grad Sch Environm Earth Sci, Sapporo, Hokkaido 0600811, Japan
[2] Hokkaido Univ, Catalysis Res Ctr, Sapporo, Hokkaido 0600811, Japan
[3] Bangladesh Open Univ, Open Sch, Gazipur 1704, Bangladesh
[4] Jozef Stefan Inst, Ljubljana, Slovenia
关键词
D O I
暂无
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 velocity and angular distributions of desorbing product CO2 were studied in steady-state CO oxidation on Pd(110) by means of cross-correlation time-of-flight techniques. CO2 desorption was always collimated along the surface-normal direction. The velocity distribution curves involved two desorption components, a fast one and a slow one. The former showed translational temperatures above 2300 K and was suddenly suppressed above a critical CO pressure at which CO retarded the reaction. On the other hand, the latter showed a Maxwellian distribution at the surface temperature and was not suddenly suppressed around the critical CO pressure, decreasing slowly at higher CO pressures. Below the critical CO pressure, the fraction of this component was around 0.3, and above it, the value abruptly increased to approximately 0.9. The slow component appears to be formed on sites which are suitable for oxygen dissociation, such as structural defects.
引用
收藏
页码:3677 / 3683
页数:7
相关论文
共 63 条
  • [1] CO oxidation on Pt(111): An ab initio density functional theory study
    Alavi, A
    Hu, PJ
    Deutsch, T
    Silvestrelli, PL
    Hutter, J
    [J]. PHYSICAL REVIEW LETTERS, 1998, 80 (16) : 3650 - 3653
  • [2] FAST REACTION-PRODUCTS FROM THE OXIDATION OF CO ON PT(111) - ANGULAR AND VELOCITY DISTRIBUTIONS OF THE CO2 PRODUCT MOLECULES
    ALLERS, KH
    PFNUR, H
    FEULNER, P
    MENZEL, D
    [J]. JOURNAL OF CHEMICAL PHYSICS, 1994, 100 (05) : 3985 - 3998
  • [3] [Anonymous], SURFACE SCI REPT
  • [4] MOLECULAR-BEAM STUDIES OF GAS-SURFACE COLLISION DYNAMICS
    ARUMAINAYAGAM, CR
    MADIX, RJ
    [J]. PROGRESS IN SURFACE SCIENCE, 1991, 38 (01) : 1 - 102
  • [5] CO-2 PRODUCT VELOCITY DISTRIBUTIONS FOR CO OXIDATION ON PLATINUM
    BECKER, CA
    COWIN, JP
    WHARTON, L
    AUERBACH, DJ
    [J]. JOURNAL OF CHEMICAL PHYSICS, 1977, 67 (07) : 3394 - 3395
  • [6] Oxygen on Pd(110): Substrate reconstruction and adsorbate geometry by tensor LEED
    Brena, B
    Comelli, G
    Ursella, L
    Paolucci, G
    [J]. SURFACE SCIENCE, 1997, 375 (2-3) : 150 - 160
  • [7] VIBRATIONAL-EXCITATION IN THE CO2 PRODUCT OF THE OXIDATION OF CO ON PLATINUM - COVERAGE DEPENDENCE AND IMPLICATIONS ON REACTION DYNAMICS
    BROWN, LS
    BERNASEK, SL
    [J]. JOURNAL OF CHEMICAL PHYSICS, 1985, 82 (04) : 2110 - 2117
  • [8] A MOLECULAR-BEAM STUDY OF THE CATALYTIC-OXIDATION OF CO ON A PT(111) SURFACE
    CAMPBELL, CT
    ERTL, G
    KUIPERS, H
    SEGNER, J
    [J]. JOURNAL OF CHEMICAL PHYSICS, 1980, 73 (11) : 5862 - 5873
  • [9] Dynamics on individual reaction sites in steady-state carbon monoxide oxidation on stepped platinum(113)
    Cao, GY
    Moula, MG
    Ohno, Y
    Matsushima, T
    [J]. JOURNAL OF PHYSICAL CHEMISTRY B, 1999, 103 (16) : 3235 - 3241
  • [10] Reaction sites working in steady-state CO oxidation on a stepped Pt(113) surface
    Cao, GY
    Seimiya, Y
    Ohno, Y
    Matsushima, T
    [J]. CHEMICAL PHYSICS LETTERS, 1998, 294 (4-5) : 419 - 424