PHOTOCATALYTIC OXIDATION OF PROPAN-2-OL BY CADMIUM-SULFIDE

被引:15
作者
GREEN, KJ [1 ]
RUDHAM, R [1 ]
机构
[1] UNIV NOTTINGHAM,DEPT CHEM,NOTTINGHAM NG7 2RD,ENGLAND
来源
JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS | 1992年 / 88卷 / 24期
关键词
D O I
10.1039/ft9928803599
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 photocatalytic oxidation of liquid propan-2-ol to propanone has been investigated using gamma-Al2O3-supported CdS, platinised CdS and Zn2+ or Ag+ cation modified CdS. Reaction proceeded only in the presence of absorbed radiation and added water, although O2 was also required with catalysts other than platinised CdS. Following confirmation of the activity of CdS based catalysts in 'visible light', measurements were made using UV radiation so that comparisons could be made with TiO2-based catalysts. Rate measurements at 303 K were made to determine the activity dependence of CdS/Al2O3 on catalyst mass, oxygen pressure, radiation intensity and water content of the reaction mixture. Activity measurements under standard conditions over the range 283-308 K showed that CdS-based catalysts possessed a common activation energy of 53 +/- 2 kJ mol-1, which was unchanged if methanol or ethanol replaced propan-2-ol as the reactant. This value is appreciably higher than the 20 +/- 1 kJ mol-1 observed with TiO2-based catalysts, which also differed in not requiring added water for reaction to proceed. The results are discussed in terms of a mechanism in which the photogenerated .OH radical is the primary oxidant. With TiO2 it is generally accepted that .OH is generated by trapping a photohole at a surface hydroxide ion; with CdS it is proposed that .OH is generated by trapping a photohole at molecularly adsorbed water.
引用
收藏
页码:3599 / 3603
页数:5
相关论文
共 34 条
  • [1] THE ROLE OF SULFITE ANION AS A HOLE SCAVENGER IN THE PHOTOCATALYTIC HYDROGEN FORMATION FROM WATER ON CDS SEMICONDUCTOR UNDER ILLUMINATION OF VISIBLE-LIGHT
    ARUGA, T
    DOMEN, K
    NAITO, S
    ONISHI, T
    TAMARU, K
    [J]. CHEMISTRY LETTERS, 1983, (07) : 1037 - 1040
  • [2] VISIBLE-LIGHT INDUCED GENERATION OF HYDROGEN FROM H2S IN CDS-DISPERSIONS, HOLE TRANSFER CATALYSIS BY RUO2
    BORGARELLO, E
    KALYANASUNDARAM, K
    GRATZEL, M
    PELIZZETTI, E
    [J]. HELVETICA CHIMICA ACTA, 1982, 65 (01) : 243 - 248
  • [3] BUHLER N, 1984, J PHYS CHEM-US, V88, P3261, DOI 10.1021/j150659a025
  • [4] PHOTOCATALYTIC OXIDATION OF PROPAN-2-OL IN LIQUID-PHASE BY RUTILE
    CUNDALL, RB
    RUDHAM, R
    SALIM, MS
    [J]. JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS I, 1976, 72 : 1642 - 1651
  • [5] H-2 PRODUCTION PHOTOSENSITIZED BY AQUEOUS SEMICONDUCTOR DISPERSIONS
    DARWENT, JR
    [J]. JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS II, 1981, 77 : 1703 - 1709
  • [6] EFFECT OF CADMIUM-SULFIDE CHARACTERISTICS ON THE PHOTOCATALYTIC OXIDATION OF THIOACETAMIDE
    DAVIS, AP
    HUANG, CP
    [J]. LANGMUIR, 1991, 7 (04) : 709 - 713
  • [7] PHOTOCATALYTIC HYDROGEN-PRODUCTION FROM A MIXTURE OF WATER AND 2-PROPANOL ON SOME SEMICONDUCTORS
    DOMEN, K
    NAITO, S
    ONISHI, T
    TAMARU, K
    [J]. CHEMISTRY LETTERS, 1982, (04) : 555 - 558
  • [8] DYNAMICS OF LIGHT-INDUCED WATER CLEAVAGE IN COLLOIDAL SYSTEMS
    DUONGHONG, D
    BORGARELLO, E
    GRATZEL, M
    [J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1981, 103 (16) : 4685 - 4690
  • [9] EGERTON TA, 1976, J OIL COLOUR CHEM AS, V59, P369
  • [10] KINETICS OF HYDROGEN-PRODUCTION FROM ILLUMINATED CDS/PT/NA2S DISPERSIONS
    FURLONG, DN
    GRIESER, F
    HAYES, D
    HAYES, R
    SASSE, W
    WELLS, D
    [J]. JOURNAL OF PHYSICAL CHEMISTRY, 1986, 90 (11) : 2388 - 2396