Basic molecules as probes for the study of Mo-alumina catalysts
Ammonia adsorption studies at 513/sup 0/-573/sup 0/K showed that the deposition of molybdenum oxide on alumina, followed by calcining, decreased the number and strength of the acid sites; that sulfiding alumina decreased the number and increased the strength of the acid sites; and that sulfiding MoO/sub 3//Al/sub 2/O/sub 3/ decreased the number of acid sites but increased their strength considerably. This last increase was attributed to the generation of anionic vacancies on the MoS/sub 2/ species during the reduction and sulfidation process. The adsorbed ammonia molecules on calcined MoO/sub 3//Al/sub 2/O/sub 3/ were mobile and on sulfided MoO/sub 3//Al/sub 2/O/sub 3/, they were localized at fixed adsorption sites.
- Research Organization:
- Indian Inst. Pet. Dehradun
- OSTI ID:
- 6448882
- Journal Information:
- J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 61:2; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201* -- Chemical & Physicochemical Properties
ADSORPTION
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
AMMONIA
CALCINATION
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
DECOMPOSITION
DEPOSITION
HIGH TEMPERATURE
HYDRIDES
HYDROGEN COMPOUNDS
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
MOLYBDENUM SULFIDES
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
OXIDES
OXYGEN COMPOUNDS
PH VALUE
PYROLYSIS
REDUCTION
REFRACTORY METAL COMPOUNDS
SORPTION
SULFIDATION
SULFIDES
SULFUR COMPOUNDS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS