Catalysis by palladium nanoparticles in microemulsions

被引:22
作者
de Jesus, DM [1 ]
Spiro, M [1 ]
机构
[1] Univ London Imperial Coll Sci Technol & Med, Dept Chem, London SW7 2AY, England
关键词
D O I
10.1021/la9915668
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The oxidatian by Co(NH3)(5)Cl2+ of N,N,N',N', tetramethyl-p-phenylenediamine (TMPPD) catalyzed by nanoparticles of palladium in an aqueous buffer/AOT/n-heptane microemulsion has been studied. The initial rates of reaction varied proportionately with the Co(NH3)(5)Cl2+ concentration, increased slightly with increasing TMPPD concentration, and rose linearly with the palladium concentration up to ca. 6 mu M. However, a much steeper increase was discovered at higher catalyst concentrations. Evidence that adsorption of TMPPD on the palladium surface was playing a major role in the rate-determining step was obtained both from the fact that the activation energy at 15 degrees C was more than twice as large as that at 40 degrees C and from electrochemical experiments with the two reactants. A microreactor model for catalyst particles in microemulsion water pools was set out, and the resulting water pool sizes and numbers have been evaluated.
引用
收藏
页码:4896 / 4900
页数:5
相关论文
共 19 条
  • [1] TRANSPORT AND KINETICS AT MICROHETEROGENEOUS ELECTRODES .5. THE METHYLVIOLOGEN PLATINUM SYSTEM
    ALBERY, WJ
    BARTLETT, PN
    MCMAHON, AJ
    [J]. JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1985, 182 (01): : 7 - 23
  • [2] [Anonymous], 1939, Journal of the American Chemical Society, DOI [10.1021/ja01877a013, DOI 10.1021/JA01877A013]
  • [3] BOUTONNET M, 1986, APPL CATAL, V20, P163
  • [4] LIQUID-PHASE HYDROGENATION OF 1-HEXENE AND 2-HEXENE WITH 30 A PLATINUM PARTICLES ON ALUMINA SUPPORT
    BOUTONNET, M
    ANDERSSON, C
    LARSSON, R
    [J]. ACTA CHEMICA SCANDINAVICA SERIES A-PHYSICAL AND INORGANIC CHEMISTRY, 1980, 34 (09): : 639 - 644
  • [5] MONODISPERSED COLLOIDAL METAL PARTICLES FROM NONAQUEOUS SOLUTIONS - CATALYTIC BEHAVIOR IN HYDROGENOLYSIS AND ISOMERIZATION OF HYDROCARBONS OF SUPPORTED PLATINUM PARTICLES
    BOUTONNET, M
    KIZLING, J
    TOUROUDE, R
    MAIRE, G
    STENIUS, P
    [J]. CATALYSIS LETTERS, 1991, 9 (5-6) : 347 - 354
  • [6] THERMODYNAMICS OF THE UPTAKE OF PROTEINS BY REVERSE MICELLES - A 1ST APPROXIMATION MODEL
    CASELLI, M
    LUISI, PL
    MAESTRO, M
    ROSELLI, R
    [J]. JOURNAL OF PHYSICAL CHEMISTRY, 1988, 92 (13) : 3899 - 3905
  • [7] CLINT JH, 1993, FARADAY DISCUSS, V95, P219
  • [8] KELLER K, 1980, SCI TECHNOLOGY PHO 5
  • [9] LIU CY, 1994, J IMAGING SCI TECHN, V38, P229
  • [10] CARBON-CATALYZED FORMATION OF HEXAMMINE COBALT(III) IN SOLUTION
    MUREINIK, RJ
    [J]. JOURNAL OF CATALYSIS, 1977, 50 (01) : 56 - 63