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US 4,392,986 AGranted
Catalyst for carboxylic anhydride production
AssigneeExxon Research & Engineering Co.
InventorsTai-Cheng Yang, Krishna K. Rao, I-Der Huang
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Abstract
A vanadium, phosphorus oxygen containing catalyst compositions capable of partially oxidizing hydrocarbons (e.g., n-butane) to form a carboxylic anhydride (e.g., maleic anhydride), a process for preparing this catalyst, and a process for using this catalyst to form such anhydrides is disclosed. The catalyst composition is prepared by an organic heterogeneous technique followed by a water treatment step and activation.
Claims31
A process for preparing a catalyst composition comprising vanadium, phosphorus and oxygen capable of catalyzing the oxidation of hydrocarbons comprising:
- (1) reacting in the presence of a liquid organic media, a vanadium containing compound present in said liquid organic media as a heterogeneous suspension and a phosphorus containing compound, in a manner and under conditions sufficient to form in said liquid organic media a heterogeneous vanadium-phosphorus-oxygen containing first catalyst precursor composition having an atomic ratio of phosphorus to vanadium of from about 0.5:1 to about 2:1, and an average vanadium valence of from about 3.9 to about 4.7;
- (2) separating said first catalyst precursor composition from said liquid organic media;
- (3) treating said first catalyst precursor composition with at least one part by weight liquid water per part by weight first catalyst precursor composition at a temperature of at least about 30.degree. C. for a period of at least about 0.5 hour to form a second vanadium-phosphorus-oxygen catalyst precursor composition;
- (4) separating said second catalyst precursor composition from said water;
- and
- (5) activating said second catalyst precursor composition in an atmosphere which excludes the presence of air alone therein.
3 more elements
Dependencies are inferred from the claim text.