Structure and characterization of supported ruthenium-cobalt bimetallic catalysts

被引:58
作者
Guczi, L [1 ]
Sundararajan, R [1 ]
Koppany, Z [1 ]
Zsoldos, Z [1 ]
Schay, Z [1 ]
Mizukami, F [1 ]
Niwa, S [1 ]
机构
[1] NATL INST MAT & CHEM RES,TSUKUBA,IBARAKI 305,JAPAN
关键词
D O I
10.1006/jcat.1997.1604
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
Ruthenium, cobalt, and ruthenium-cobalt bimetallic samples, supported on SiO2, Al2O3, and NaY zeolite, were characterized by temperature-programmed reduction, CO chemisorption, X-ray diffraction, X-ray photoelectron spectroscopy, and transmission electron microscopy, Temperature-programmed reduction revealed that the reducibility for cobalt increases in the order NaY < SiO2 < Al2O3, while for ruthenium the sequence was Al2O3 < NaY < SiO2. If Ru/NaY samples are calcined in oxygen, then ruthenium migrates to the external surface of NaY and agglomerates, while in the case of He-treated zeolite samples the ruthenium metal particles are stabilized in the supercage in the range of 1 to 3 nm average diameter, as measured by X-ray diffraction, CO chemisorption, and transmission electron microscopy. Cobalt ions are irreducible when they are exchanged alone or first in the NaY zeolite for the bimetallic sample Ru-Co/NaY[I]. Here the reduction of Ru3+ ions is not affected by the presence of cobalt, whereas when Ru3+ ions exchanged rst Into NaY (Ru-Co/NaY[II]), the cobalt ions are easily reduced and bimetallic particles are formed but the migration of ruthenium particles to the outer surface of NaY zeolite is hampered. (C) 1997 Academic Press.
引用
收藏
页码:482 / 494
页数:13
相关论文
共 52 条
  • [21] A LOW-TEMPERATURE REACTION SEQUENCE FOR METHANE CONVERSION
    KOERTS, T
    VANSANTEN, RA
    [J]. JOURNAL OF THE CHEMICAL SOCIETY-CHEMICAL COMMUNICATIONS, 1991, (18) : 1281 - 1283
  • [22] MECHANISM OF CARBON-CARBON BOND FORMATION BY TRANSITION-METALS
    KOERTS, T
    VANSANTEN, RA
    [J]. JOURNAL OF MOLECULAR CATALYSIS, 1992, 74 (1-3): : 185 - 191
  • [23] HOMOLOGATION OF OLEFINS WITH METHANE ON TRANSITION-METALS
    KOERTS, T
    LECLERCQ, PA
    VANSANTEN, RA
    [J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1992, 114 (18) : 7272 - 7278
  • [24] HYDROCARBON FORMATION FROM METHANE BY A LOW-TEMPERATURE 2-STEP REACTION SEQUENCE
    KOERTS, T
    DEELEN, MJAG
    VANSANTEN, RA
    [J]. JOURNAL OF CATALYSIS, 1992, 138 (01) : 101 - 114
  • [25] KOERTS T, 1994, APPL CATAL A-GEN, V15, P315
  • [26] Ruthenium promotion of Co/Al2O3 Fischer-Tropsch catalysts
    Kogelbauer, A
    Goodwin, JG
    Oukaci, R
    [J]. JOURNAL OF CATALYSIS, 1996, 160 (01) : 125 - 133
  • [27] SYNTHESIS OF SOME RING-SUBSTITUTED RUTHENOCENES AND THEIR USE IN THE PREPARATION OF RU/ZSM-5 CATALYSTS
    LEMAY, G
    KALIAGUINE, S
    ADNOT, A
    NAHAR, S
    COZAK, D
    MONNIER, J
    [J]. CANADIAN JOURNAL OF CHEMISTRY-REVUE CANADIENNE DE CHIMIE, 1986, 64 (09): : 1943 - 1948
  • [28] STABILITY OF PT-CO BIMETALLIC PARTICLES - EFFECT OF THE SUPPORT INDUCED MORPHOLOGY ON REACTIVITY IN CO HYDROGENATION
    LU, G
    ZSOLDOS, Z
    KOPPANY, Z
    GUCZI, L
    [J]. CATALYSIS LETTERS, 1994, 24 (1-2) : 15 - 22
  • [29] CORRELATION BETWEEN CHEMISORPTION AND THE MECHANISM OF CARBON-MONOXIDE HYDROGENATION OVER PT-CO/NAY CATALYSTS
    LU, GM
    HOFFER, T
    GUCZI, L
    [J]. APPLIED CATALYSIS A-GENERAL, 1992, 93 (01) : 61 - 73
  • [30] REDUCIBILITY AND CO HYDROGENATION OVER PT AND PT-CO BIMETALLIC CATALYSTS ENCAGED IN NAY-ZEOLITE
    LU, GM
    HOFFER, T
    GUCZI, L
    [J]. CATALYSIS LETTERS, 1992, 14 (02) : 207 - 220