Process for improving phosphorus-vanadium oxide and phosphorus-vanadium-co-metal oxide catalysts
A process is described for the improvement of a vanadium-phosphorus-oxygen catalyst having a phosphorus to vanadium atomic ratio of about 2:1 to about 0.8:1 which catalyst is present on a catalyst bed having a portion therof containing an initial exotherm of reaction. The catalyst is suitable for use in the manufacture of maleic anhydride from a feed gas stream comprising C/sub 4/ hydrocarbons, benzene, or butane which process comprises: applying to the catalyst bed, simultaneously with introduction of the feed gas stream thereon, water and a phosphorus compound in an amount sufficient to initiate (a) deactivation of the portion of the catalyst containing the initial exotherm, and (b) formation of a new exotherm downstream in the catalyst bed from the initial exotherm, and thereafter reducing or discontinuing application of the phosphorus compound at a point in time when the initial exotherm portion of the catalyst bed is still undergoing deactivation, thereby allowing the partially deactivated exotherm portion to reactivate by producing a more isothermal catalyst bed.
- Assignee:
- Amoco Corp., Chicago, IL
- Patent Number(s):
- US 4701433
- OSTI ID:
- 5852296
- Resource Relation:
- Patent File Date: Filed date 26 Aug 1986
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
BENZENE
CATALYSIS
BUTANE
CATALYSTS
ACTIVATION ENERGY
CHEMICAL COMPOSITION
CHEMICAL PREPARATION
HYDROCARBONS
ANHYDRIDES
COBALT OXIDES
MALEIC ACID
OXYGEN
PHOSPHORUS OXIDES
PRODUCTION
VANADIUM OXIDES
WATER
ALKANES
AROMATICS
CARBOXYLIC ACIDS
CHALCOGENIDES
COBALT COMPOUNDS
DICARBOXYLIC ACIDS
ELEMENTS
ENERGY
HYDROGEN COMPOUNDS
NONMETALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHOSPHORUS COMPOUNDS
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
VANADIUM COMPOUNDS
400201* - Chemical & Physicochemical Properties