Alkali metal-modified vanadium-phosphorus oxide (VPO) catalyst
First Claim
1. A catalyst comprising a vanadium-phosphorus oxide and an alkali metal selected from the group consisting of sodium, potassium and mixtures thereof, wherein the proportion by weight of alkali metal in the vanadium-phosphorus oxide is in the range from 10 to 400 ppm and wherein the vanadium-phosphorus oxide contains 0.10 to 0.90 w.t.-% molybdenum, based on the total weight of the vanadium-phosphorus oxide, respectively.
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Abstract
The present invention relates to a catalyst containing a vanadium-phosphorus oxide and an alkali metal, wherein the proportion by weight of alkali metal in the vanadium-phosphorus oxide is in the range from 10 to 400 ppm, based on the total weight of the vanadium-phosphorus oxide, a process for producing it and also the use of the catalyst for the gas-phase oxidation of hydrocarbons, in particular for preparing maleic anhydride.
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12 Claims
- 1. A catalyst comprising a vanadium-phosphorus oxide and an alkali metal selected from the group consisting of sodium, potassium and mixtures thereof, wherein the proportion by weight of alkali metal in the vanadium-phosphorus oxide is in the range from 10 to 400 ppm and wherein the vanadium-phosphorus oxide contains 0.10 to 0.90 w.t.-% molybdenum, based on the total weight of the vanadium-phosphorus oxide, respectively.
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6. The catalyst as claimed in claim , wherein the catalyst consists of the vanadium-phosphorus oxide.
- 8. A catalyst for the gas-phase oxidation of a hydrocarbon comprising a vanadium-phosphorus oxide and an alkali metal, wherein the alkali metal is selected from the group consisting of sodium, potassium and mixtures thereof, wherein the proportion by weight of alkali metal in the vanadium-phosphorus oxide is in the range from 10 to 400 ppm and wherein the vanadium-phosphorus oxide contains 0.10 to 0.90 w.t.-% molybdenum, based on the total weight of the vanadium-phosphorus oxide, respectively.
Specification