IR study of CO adsorption on Pt, Re and Pt-Re/Al2O3 catalysts before and after coking

被引:33
作者
Anderson, JA [1 ]
Chong, FK [1 ]
Rochester, CH [1 ]
机构
[1] Univ Dundee, Dept Chem, Dundee DD1 4HN, Scotland
关键词
Pt-Re/Al2O3; CO adsorption; Re/Al2O3; Pt-Re coking;
D O I
10.1016/S1381-1169(98)00210-6
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
Infrared (IR) spectra are reported of CO adsorbed on alumina-supported Pt, Re and Pt-Re catalysts before and after coking by exposure to heptane at 683 K. For Pt, dominant sites for linear GO were in short terraces akin to those in high index planes. For Re, initial adsorption on three-dimensional crystallites giving Re-O-CO was followed by slow carbonylation leading to Re-2(CO)(10), Re(CO)(3) and possibly Re(CO)(5) on the alumina support. The formation of Re(CO)(3) was promoted by higher precalcination temperature before catalyst reduction. For Pt-Re, all the effects characteristic of the separate catalysts were observed. The Pt dispersions were similar for Pt alone and Pt-Re. However, the availability of Re sites was considerable enhanced in the mixed system. Short terraces on Pt or Pt-Re particles did not contain Re atoms, which were located at kink or edge sites on the particles or were spread in a phase consisting mainly of Re over the alumina surface. Coking of Pt was greater than that of Be, although the latter was enhanced for Pt-Re. Small patches of uncoked Pt were enlarged after addition of CO at 293 K showing GO-induced mobility of the carbonaceous layer. (C) 1999 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:65 / 80
页数:16
相关论文
共 50 条
  • [1] INFRARED STUDY OF THE EFFECTS OF OXIDATION REDUCTION TREATMENTS ON PT DISPERSION IN PT/AL2O3 CATALYSTS
    ANDERSON, JA
    MORDENTE, MGV
    ROCHESTER, CH
    [J]. JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS I, 1989, 85 : 2983 - 2990
  • [2] ANDERSON JM, IN PRESS
  • [3] ON THE MECHANISM FOR THE PLATINUM-CATALYZED REDUCTION OF RHENIUM IN PTRE/GAMMA-AL2O3
    AUGUSTINE, SM
    SACHTLER, WMH
    [J]. JOURNAL OF CATALYSIS, 1989, 116 (01) : 184 - 194
  • [4] THERMAL-DESORPTION INFRARED STUDY OF CARBON-MONOXIDE ADSORPTION BY ALUMINA-SUPPORTED PLATINUM
    BARTH, R
    PITCHAI, R
    ANDERSON, RL
    VERYKIOS, XE
    [J]. JOURNAL OF CATALYSIS, 1989, 116 (01) : 61 - 70
  • [5] ADSORPTION OF CARBON-MONOXIDE ON PLATINUM ALLOYS - AN INFRARED INVESTIGATION
    BASTEIN, AGTM
    TOOLENAAR, FJCM
    PONEC, V
    [J]. JOURNAL OF CATALYSIS, 1984, 90 (01) : 88 - 95
  • [6] ACTIVITY, SELECTIVITY AND COKING OVER MONO-METALLIC AND BIMETALLIC REFORMING CATALYSTS
    BELTRAMINI, J
    TRIMM, DL
    [J]. APPLIED CATALYSIS, 1987, 32 (1-2): : 71 - 83
  • [7] COKE DEPOSITION ON NAPHTHA REFORMING CATALYSTS .2. INFLUENCE OF THE ADDITION OF A 2ND METAL TO PLATINUM
    BELTRAMINI, JN
    DATTA, R
    [J]. REACTION KINETICS AND CATALYSIS LETTERS, 1991, 44 (02): : 353 - 359
  • [8] PLATINUM-RHENIUM-ALUMINA CATALYSTS .2. STUDY OF METALLIC PHASE AFTER REDUCTION
    BOLIVAR, C
    CHARCOSSET, H
    FRETY, R
    PRIMET, M
    TOURNAYAN, L
    BETIZEAU, C
    LECLERCQ, G
    MAUREL, R
    [J]. JOURNAL OF CATALYSIS, 1976, 45 (02) : 163 - 178
  • [9] STATE OF RE IN PT-RE-GAMMA-AL2O3 CATALYSTS
    CHARCOSSET, H
    FRETY, R
    LECLERCQ, G
    MENDES, E
    PRIMET, M
    TOURNAYAN, L
    [J]. JOURNAL OF CATALYSIS, 1979, 56 (03) : 468 - 471
  • [10] STRUCTURE CHARACTERIZATION OF PLATINUM/ALUMINA, RHENIUM/ALUMINA, AND PLATINUM-RHENIUM/ALUMINA CATALYSTS
    CHEN, LY
    NI, YQ
    ZANG, JL
    LIN, LW
    LUO, XH
    CHENG, S
    [J]. JOURNAL OF CATALYSIS, 1994, 145 (01) : 132 - 140