The influence of zinc on the surface properties of cobalt-alumina catalysts

Journal Article · Fri Jan 01 04:00:00 EST 1982 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(82)90015-X· OSTI ID:6888396

Chin, R L; Hercules, D M

Addition of a small quantity of zinc to ..gamma..-Al/sub 2/0/sub 3/ was studied with respect to influence on the surface properties of a series of Co/Al/sub 2/O/sub 3/ catalysts. ESCA and ISS results indicate that at low cobalt concentrations (less than or equal to8% Co) the presence of zinc can enhance formation of a cobalt ''surface spinel'' resulting from the diffusion of Co ions into tetrahedral sites of the ..gamma..-Al/sub 2/O/sub 3/ support. At higher cobalt loadings a drastic increase in the ESCA and ISS metal/support intensity ratios is seen relative to catalysts without zinc. X-Ray diffraction data indicate that the increases in intensity ratios result from an increase in dispersion, i.e., generation of smaller cobalt oxide crystallites in the zinc-doped catalysts. For a series of catalysts having fixed cobalt concentrations, the influence of particle size on ESCA and ISS intensity ratios was determined.

• Research Organization: Univ. of Pittsburgh, PA
• DOE Contract Number: AC02-79ER10485
• OSTI ID: 6888396
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 74:1; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BINDING ENERGY
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL PROPERTIES
COBALT
CONCENTRATION RATIO
DATA
ELEMENTS
ENERGY
EQUATIONS
EXPERIMENTAL DATA
HIGH TEMPERATURE
INFORMATION
METALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
SIZE
SPECTRA
SURFACE PROPERTIES
TRANSITION ELEMENTS
ZINC