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TITLE:
Effects of dispersion and
support on adsorption, catalytic and electronic properties of cobalt/alumina CO hydrogenation
catalysts.
Final progress report, August 1, 1987--July 31, 1990.
AUTHOR:
C. H. Bartholomew.
INST.
AUTHOR: Brigham Young Univ.,
Provo, UT. Catalysis Lab.
SPONSOR:
Department of Energy, Washington, DC.
LANGUAGE:
English
PUB.
TYPE: Technical Report
PUB.
COUNTRY: United States
SOURCE:
Department of Energy [DE], 29
Sep 90, 10p.
NTIS ORDER NO.:
DE92010656INW
ABSTRACT:
An investigation of the effects of surface structure,
dispersion, and support on the adsorption, catalytic, and electronic
properties of cobalt/alumina is described, the objectives of which were to
determine (1) the effects of surface structure and metal dispersion on the
adsorption and catalytic properties of cobalt and (2) the effects of direct
electronic interactions between metal clusters and support, on the adsorption,
catalytic and electronic properties of cobalt supported on alumina. Effects of
surface structure and dispersion on the adsorption, activity/selectivity, and
electronic properties of Co/W single crystal surfaces and alumina-supported
cobalt were investigated in a surface investigation, lab reactor studies,
TPD/TPSR studies, and a Moessbauer spectroscopy study. The structure,
stability, surface electronic properties, and chemisorptive properties of
vapor-deposited cobalt overlayers (0-4 ML) on W(110) and W(100) were studied
by Auger electron spectroscopy, low energy electron diffraction, work function
changes, and temperature programmed desorption (TPD) of cobalt, hydrogen, and
carbon monoxide. The CO chemisorptive properties of the two cobalt overlayers
are quite different, CO adsorption being dissociative on the W(100) surface
and nondissociative on the W(110) surface; comparison of the results with
those for Ni/W(100) indicate that Co/W(100) dissociates CO as a result of
electronic interaction with the tungsten substrate.
REPORT
NUMBER: DOE/ER/13763-2
CONTRACT
NUMBER: FG02-87ER13763
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