Influence of reductive pretreatments on the activity and selectivity of vanadium-phosphorus oxide catalysts for n-butane partial oxidation
The catalytic activities for n-butane conversion to maleic anhydride of two series of vanadium-phosphorus oxide catalysts with phosphorus:vanadium ratios in the range 0.94 to 1.10 and calcined at 773 or 923 K were compared before and after reduction by hydrogen. In almost all cases studied, reduction gave rise to increased conversion, and for catalysts with low phosphorus:vanadium ratios increased selectivity was also noted. When n-butane was contacted with these catalysts in the absence of gas phase oxygen, maleic anhydride and total oxidation products continued to be formed until changes in average oxidation state of vanadium of up to -1.5 were recorded. From considerations of the dynamic state of the catalysts during catalysis, it was concluded that a morphology consisting of oxidized surface layers on a reduced core favors high activities and selectivities for this process.
- Research Organization:
- Groupe de Physico-Chimie Minerale et de Catalyse, Universite Catholique de Louvain, Louvain-la-Neuve
- OSTI ID:
- 5069533
- Journal Information:
- Ind. Eng. Chem. Fundam.; (United States), Vol. 23:4
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BUTANE
REDUCTION
PHOSPHORUS OXIDES
CATALYTIC EFFECTS
VANADIUM OXIDES
ANHYDRIDES
CALCINATION
CATALYSIS
CATALYSTS
CHEMICAL ACTIVATION
CHEMICAL REACTION KINETICS
HIGH TEMPERATURE
HYDROGEN
MALEIC ACID
MORPHOLOGY
SURFACE PROPERTIES
ALKANES
CARBOXYLIC ACIDS
CHALCOGENIDES
CHEMICAL REACTIONS
DECOMPOSITION
DICARBOXYLIC ACIDS
ELEMENTS
HYDROCARBONS
KINETICS
NONMETALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHOSPHORUS COMPOUNDS
PYROLYSIS
REACTION KINETICS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
VANADIUM COMPOUNDS
020400* - Petroleum- Processing