Properties of supported metal catalysts. Progress report, April 1, 1977-March 31, 1978

Technical Report · Thu Dec 01 04:00:00 EST 1977

OSTI ID:6369071

Burwell, Jr, R L; Butt, J B; Cohen, J B

Characterization of silica-supported platinum catalysts by chemical reactivity has included investigation of hydrogen chemisorption, hydrogen reaction of surface adsorbed oxygen, hydrogenation of propene, hydrogenolysis of cyclopropane and methylcyclopropane, and deuterium exchange with cyclopentane. Substantial influence of the metal structure, in terms of the percent exposure of platinum, on its catlaytic behavior has been revealed for each of these reactions with the exception of hydrogen chemisorption and deuterium exchange with cyclopentane. In the latter case, however, the selectivity for isotopic distribution is structure sensitive. The specific conditions of catalyst pretreatment have been shown to affect substantially the nature of the structure sensitive behavior in all cases. X-ray characterization of catalysts up to 40% exposed has been completed. Using Fourier line shape analysis, the percent exposure, average particle size, size distribution, lattice parameter, and thermal vibrational amplitudes have been determined. The X-ray measurements of percentage exposed are in good agreement with hydrogen chemisorption results, and the thermal vibrational amplitudes have been shown to be correlated with percentage exposed.

• Research Organization: Northwestern Univ., Evanston, IL (USA)
• DOE Contract Number: AC02-77ER04254
• OSTI ID: 6369071
• Report Number(s): DOE/ER/04254-T1; ON: DE85006078
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400303 -- Organic Chemistry-- Isotope Exchange & Isotope Separation-- (-1987)
ALKANES
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
COHERENT SCATTERING
CYCLOALKANES
DEUTERIUM
DIFFRACTION
ELEMENTS
HYDROCARBONS
HYDROGEN ISOTOPES
HYDROGENATION
ISOTOPES
ISOTOPIC EXCHANGE
LIGHT NUCLEI
METALS
MINERALS
NUCLEI
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
RESEARCH PROGRAMS
SCATTERING
SEPARATION PROCESSES
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SORPTION
STABLE ISOTOPES
TRANSITION ELEMENTS
X-RAY DIFFRACTION