Gas phase oxidation catalyst with low charge transport activation energy
AssigneeBASF SE
InventorsAndrey Karpov, Cornelia Katharina Dobner, Frank Rosowski, Mark Eichelbaum, Annettte Trunschke, Robert Schloegl
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Abstract
A catalyst for the gas phase oxidation of organic hydrocarbons comprises a multielement oxide which comprises at least one transition meal such as vanadium, wherein the catalyst has a charge transport activation energy Ec at a temperature of 375 to 425° C. of less than 0 kJ/mol. The catalyst serves for preparation of maleic anhydride.
Claims7
A catalyst for the gas phase oxidation of organic hydrocarbons, comprising a multi-element oxide which comprises at least one transition metal, wherein the catalyst has a charge transport activation energy Ec at a temperature of 375 to 425° C. of less than 0 kJ/mol.
A process for optimizing a catalyst for the gas phase oxidation of organic hydrocarbons, said process comprising:
- a) preparing a first catalyst under a first set of preparation conditions, wherein the first set of preparation conditions comprises:
- (1) reacting a pentavalent vanadium compound with an organic reducing solvent in the presence of a phosphorus compound while heating to produce a vanadium-, phosphorus-, and oxygen-comprising catalyst precursor (“VPO precursor”);
- (2) isolating the VPO precursor;
- (3) drying the VPO precursor at a temperature of 50 to 200° C.;
- (4) shaping by conversion to the desired structure;
- and
- (5) calcining the shaped VPO precursor by heating in an atmosphere comprising oxygen (O2), hydrogen oxide (H2O), and/or inert gas;
- b) preparing at least one further catalyst under a varied set of preparation conditions, wherein one or more of the following reaction conditions is varied:
- the composition of the catalyst;
- the morphology of the catalyst;
- the calcination conditions;
- the formation conditions;
- and
- the content in the VPO precursor of sorbed organic solvents on commencement of the calcination
- c) determining the charge transport activation energy Ec of the first and of the at least one further catalyst, and
- d) identifying a catalyst having a charge transport activation energy Ec of less than 0 kJ/mol as an optimized catalyst.
Dependencies are inferred from the claim text.