Studies of supported metal catalysts. Progress report, September 1, 1979-August 31, 1982

Technical Report · Fri Apr 01 00:00:00 EST 1983

OSTI ID:6577082

Hercules, D M

The overall objective of this research was to characterize the binding of transition metals to catalytic supports, and to study speciation of these metals on supports. The accomplishments during this period fall into two categories. First, we have advanced the adapation of spectroscopic instrumentation for studying catalytic surfaces. Second, we have obtained interesting and valuable information about a variety of catalytic systems. One of the most interesting accomplishments was to demonstrate the utility of using the combination of x-ray Photoelectron Spectroscopy (ESCA), Low Energy Ion Scattering Spectroscopy (ISS) and Laser Raman Spectroscopy (LRS) to study catalytic surfaces. We have demonstrated the correlation between ESCA, EXAFS and Photoacoustic Spectroscopy (PAS) measurements on the same catalyst systems. We have been able to characterize nickel species on alumina and silica surfaces when the preparation method and nickel content of the catalysts are varied. Second, we have studied the nature of cobalt species on alumina and how these species are affected by the presence of molybdenum or zinc, or by sulfiding. Third, we have been able to study the species of molybdenum on an alumina catalyst and to determine how these species are changed by sulfiding, by the presence of cobalt or by being supported on titania. Fourth, we have studied tungsten on alumina and shown how the catalyst species for tungsten differ from those for molybdenum on the same support. Fifth, we have carried out an extensive study of photoacoustic measurements to determine the site symmetry of cobalt and nickel supported on alumina.

• Research Organization: Pittsburgh Univ., PA (USA)
• DOE Contract Number: AC02-79ER10485
• OSTI ID: 6577082
• Report Number(s): DOE/ER/10485-T2; ON: DE83005085
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ALUMINIUM OXIDES
SURFACE PROPERTIES
CATALYSTS
CHEMICAL PREPARATION
RESEARCH PROGRAMS
COBALT
MOLYBDENUM
NICKEL
SILICA
TITANIUM OXIDES
TUNGSTEN
AUGER ELECTRON SPECTROSCOPY
CATALYST SUPPORTS
CATALYTIC EFFECTS
ION MICROPROBE ANALYSIS
MASS SPECTROSCOPY
PHOTOACOUSTIC SPECTROSCOPY
PHOTOELECTRON SPECTROSCOPY
X-RAY DIFFRACTION
ALUMINIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL ANALYSIS
COHERENT SCATTERING
DIFFRACTION
ELECTRON SPECTROSCOPY
ELEMENTS
METALS
MICROANALYSIS
MINERALS
NONDESTRUCTIVE ANALYSIS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
SCATTERING
SILICON COMPOUNDS
SILICON OXIDES
SPECTROSCOPY
SYNTHESIS
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
400201* - Chemical & Physicochemical Properties