Patent ID: 6777369
Filing Date: 2004-08-17
Classification: B01J,C07C,Y02P,Y10S,Y10T

Abstract:
A process for producing a catalyst, which comprises dispersing, in water, a used catalyst containing at least molybdenum, an A element (at least one element selected from the group consisting of phosphorus and arsenic) and an X element (at least one element selected from the group consisting of potassium, rubidium and cesium), adding thereto an alkali metal compound and/or ammonia solution so as to adjust the resulting mixture to pH 8 or more, then adding thereto an acid so as to adjust the resulting mixture to pH 6.5 or less to generate a precipitate containing at least said molybdenum and said A element, separating the precipitate from the liquid containing the precipitate, and forming a catalyst from the precipitate as a source material for said catalyst.