The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 02, 2022
Filed:
Jan. 16, 2020
Clariant International Ltd, Muttenz, CH;
Sebastian Boecklein, Heufeld, DE;
Gerhard Mestl, Munich, DE;
Gabriele Bindseil, Bruckmuehl, DE;
Rene Hausmann, Bad Aibling, DE;
Sarah Limbrunner, Bruckmuehl, DE;
Anna Waldschuetz, Tuntenhausen, DE;
CLARIANT INTERNATIONAL LTD, Muttenz, CH;
Abstract
The disclosure relates to a process for producing a VPO catalyst containing molybdenum and a vanadyl pyrophosphate phase, which comprises the steps: a) provision of a reaction mixture comprising a V(V) compound, a P(V) compound, an Mo compound, a reducing agent and a solvent, b) reduction of the V(V) compound by means of the reducing agent at least in parts to give vanadyl hydrogenphosphate in order to obtain an intermediate suspension, c) filtration of the intermediate suspension from step b) in order to obtain an intermediate, d) drying of the intermediate at a temperature of not more than 350° C. in order to obtain a dried intermediate and e) activation of the dried intermediate at a temperature above 200° C., characterized in that not more than 0.2% by weight of water, based on the weight of the reaction mixture, is present in step a) and no water is withdrawn during the reduction in step b). The disclosure further relates to a VPO catalyst which is able to be produced by the process of the disclosure and also a catalyst containing the molybdenum-containing vanadium-phosphorus mixed oxide.