Properties of lanthanide oxides as supports for transition metal catalysts. Progress report, May 1, 1984-April 30, 1985
The objective of this research has been to characterize the effect of support variations on the catalytic and surface properties of dispersed Group VIII transition metals. Particular emphasis has been placed on investigating behavior modifications induced by lanthanide oxide supports, in comparison to those of other, more conventional, support materials. Our investigations have focused primarily on support effects involving dispersed cobalt catalysts. Our results demonstrate that the nature of the support has a significant influence on the reduction and surface properties of dispersed cobalt. X-ray photoelectron spectroscopy (XPS) studies show that reduction in H/sub 2/ of SiO/sub 2/- supported Co(NO/sub 3/)/sub 2/, without prior calcination, results in considerable bulk metal formation, but that extensive monolayer regions of unreduced Co/sup 2 +/ species remain on the surface, even after treatment in H/sub 2/ at 500 to 700/sup 0/C. If the supported Co(NO/sub 3/)/sub 2/ is converted to CoO/sub x/ by prior calcination, on the other hand, subsequent treatment in H/sub 2/ results in essentially complete reduction to the zero-valent metal. On a TiO/sub 2/ support, cobalt is more easily reduced than on SiO/sub 2/, and on the lanthanide oxide supports La/sub 2/O/sub 3/, Eu/sub 2/O/sub 3/, and CeO/sub 2/, reduction occurs even more readily, but extensive additional interactions exist, particularly with CeO/sub 2/. 18 references, 13 figures, 1 table.
- Research Organization:
- Texas A and M Univ., College Station (USA). Dept. of Chemistry
- DOE Contract Number:
- AS05-78ER06042
- OSTI ID:
- 6187943
- Report Number(s):
- DOE/ER/06042-5; ON: DE85006486
- Resource Relation:
- Other Information: Portions are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
Similar Records
Fischer-Tropsch synthesis: Direct cobalt nitrate reduction of promoted Co/TiO2 catalysts
Characterization of supported cobalt catalysts for CO hydrogenation
Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CATALYST SUPPORTS
CHEMISTRY
COMPARATIVE EVALUATIONS
CATALYSTS
CHEMICAL PREPARATION
CERIUM OXIDES
BINDING ENERGY
COBALT
SURFACE PROPERTIES
COBALT NITRATES
REDUCTION
EUROPIUM OXIDES
LANTHANUM OXIDES
SILICA
TITANIUM OXIDES
CALCINATION
CARBON MONOXIDE
EXPERIMENTAL DATA
HIGH TEMPERATURE
HYDROGEN
PHOTOELECTRON SPECTROSCOPY
X RADIATION
CARBON COMPOUNDS
CARBON OXIDES
CERIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
COBALT COMPOUNDS
DATA
DECOMPOSITION
ELECTROMAGNETIC RADIATION
ELECTRON SPECTROSCOPY
ELEMENTS
ENERGY
EUROPIUM COMPOUNDS
INFORMATION
IONIZING RADIATIONS
LANTHANUM COMPOUNDS
METALS
MINERALS
NITRATES
NITROGEN COMPOUNDS
NONMETALS
NUMERICAL DATA
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PYROLYSIS
RADIATIONS
RARE EARTH COMPOUNDS
SILICON COMPOUNDS
SILICON OXIDES
SPECTROSCOPY
SYNTHESIS
THERMOCHEMICAL PROCESSES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
400201* - Chemical & Physicochemical Properties