Method for preparing a catalyst and intermediate formed thereby

Details Method for preparing a catalyst and intermediate formed thereby Method for preparing a catalyst and intermediate formed thereby

B - Operations, Transporting

01

J

252/98

B01J 23/20 (2006.01) B01J 27/198 (2006.01) C07C 51/215 (2006.01)

Patent

CA 1104114

In conventional procedures for the preparation of phosphorus-vanadium-oxygen catalysts, with or without promoting elements or carriers, the phosphorus compounds and vanadium compounds are mixed under conditions to form precursors. These precursors are then heated to temperatures up to 600°C. to form phosphorus-vanadium- oxygen catalsyts suitable for the conversion of saturated hydrocarbons, such as butane, to maleic anhydride. According to this invention, a preheat step (60-120°C.) is introduced for a period of time sufficient to form an intermediate prior to the above described heat step, according to which a new phosphorus-vanadium-oxygen compos- ition is formed which is converted to the precursor. Catalysts formed by the process of the present invention, when used for the conversion of saturated hydrocarbons to maleic anhydride, provide higher yields of maleic anhydride.

280975

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