Thermal behavior of shell molybdena-alumina catalysts
Journal Article
·
· AIChE Symp. Ser.; (United States)
Heat treatment of ''shell'' molybdena-alumina catalyst pellets results in macroscopic redistribution of the molybdena. Redistribution is minimal at 625/sup 0/C but extensive at 750/sup 0/C. After 6 hours at 750/sup 0/, a sharp maximum is observed in the radial distribution. This is a result of opposing factors: radial diffusion inward from the initial shell, and preferential sintering of the alumina support in the shell region. Loss of molybdena by vaporization is not appreciable at 750/sup 0/C but is serious at 875/sup 0/C. A computer program has been developed to convert SEM-EDAX (scanning electron microscopy energy-dispersive analysis of x-ray) data for unpolished pellet sections to a quantitative, smooth profile of Mo concentration as a function of reduced radial position.
- Research Organization:
- Department of Chemical Engineering, State University of New York at Buffalo, Buffalo, NY
- OSTI ID:
- 6264817
- Journal Information:
- AIChE Symp. Ser.; (United States), Journal Name: AIChE Symp. Ser.; (United States) Vol. 31:3; ISSN ACSSC
- Country of Publication:
- United States
- Language:
- English
Similar Records
Sintering of 'shell' molybdena-alumina catalysts
Molybdena redistribution in shell MoO/sub 3//Al/sub 2/O/sub 3/ catalysts was studied by using energy dispersive X-ray spectrometry with a scanning electron microscope
Preparation and genesis of molybdena-alumina and related catalyst systems
Journal Article
·
Thu Mar 29 23:00:00 EST 1979
· J. Catal.; (United States)
·
OSTI ID:7128262
Molybdena redistribution in shell MoO/sub 3//Al/sub 2/O/sub 3/ catalysts was studied by using energy dispersive X-ray spectrometry with a scanning electron microscope
Conference
·
Sun Dec 31 23:00:00 EST 1978
· 72nd AIChE Annu. Meet. Prepr.; (United States)
·
OSTI ID:6275690
Preparation and genesis of molybdena-alumina and related catalyst systems
Journal Article
·
Wed Sep 01 00:00:00 EDT 1982
· J. Catal.; (United States)
·
OSTI ID:6593979
Related Subjects
02 PETROLEUM
020400* -- Petroleum-- Processing
36 MATERIALS SCIENCE
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYSTS
CHALCOGENIDES
DATA ANALYSIS
DIFFUSION
ELECTRON MICROSCOPY
EVAPORATION
FABRICATION
HEAT TREATMENTS
HIGH TEMPERATURE
LOSSES
MICROSCOPY
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PELLETS
PHASE TRANSFORMATIONS
REFRACTORY METAL COMPOUNDS
SCANNING ELECTRON MICROSCOPY
SINTERING
TEMPERATURE EFFECTS
THERMAL DIFFUSION
THERMODYNAMICS
TRANSITION ELEMENT COMPOUNDS
VERY HIGH TEMPERATURE
020400* -- Petroleum-- Processing
36 MATERIALS SCIENCE
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYSTS
CHALCOGENIDES
DATA ANALYSIS
DIFFUSION
ELECTRON MICROSCOPY
EVAPORATION
FABRICATION
HEAT TREATMENTS
HIGH TEMPERATURE
LOSSES
MICROSCOPY
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PELLETS
PHASE TRANSFORMATIONS
REFRACTORY METAL COMPOUNDS
SCANNING ELECTRON MICROSCOPY
SINTERING
TEMPERATURE EFFECTS
THERMAL DIFFUSION
THERMODYNAMICS
TRANSITION ELEMENT COMPOUNDS
VERY HIGH TEMPERATURE