Surface spectroscopic study of molybdena/alumina catalysts using X-ray photoelectron, ion-scattering, and Raman spectroscopies

Journal Article · Thu Oct 30 04:00:00 EST 1980 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100459a015· OSTI ID:6223453

Zingg, D S ^[1]; Makovsky, L E; Tischer, R E; Brown, F R; Hercules, D M

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1. Univ. of Pittsburgh

The model hydrodesulfurization catalysts studied contained 1-30% MoO/sub 3/ on ..gamma..-alumina and were calcined at 400/sup 0/-700/sup 0/C for 1-32 hr and reduced at 500/sup 0/C in hydrogen. At low MoO/sub 3/ loadings (to approx. 8%), molybdenum in the tetrahedral lattice of alumina was the main species; at higher coverage of MoO/sub 3/, to monolayer coverage (approx. 20% MoO/sub 3/), molybdenum in the octahedral lattice of ..gamma..-alumina became more important; around monolayer concentration of MoO/sub 3/, Al/sub 2/(MoO/sub 4/)/sub 3/ started to form; and at higher molybdena concentration, bulk MoO/sub 3/ was also observed. An increase in calcination temperature and time favored formation of the tetrahedral lattice species and of Al/sub 2/(MoO/sub 4/)/sub 3/.

• OSTI ID: 6223453
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 84:22; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALUMINIUM COMPLEXES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CALCINATION
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
COMPLEXES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DATA
DECOMPOSITION
DESULFURIZATION
ELECTRON SPECTROSCOPY
EXPERIMENTAL DATA
HIGH TEMPERATURE
INFORMATION
ION SPECTROSCOPY
MOLYBDENUM COMPLEXES
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHOTOELECTRON SPECTROSCOPY
PYROLYSIS
REDUCTION
REFRACTORY METAL COMPOUNDS
SPECTROSCOPY
SURFACE PROPERTIES
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENT COMPOUNDS
X-RAY SPECTROSCOPY