Chemical homogeneity and catalytic performance of mixed-metal oxide catalysts
AssigneeUop LLC
InventorsJames M. Hodges, Joel T. Walenga, Scott Lyle Nauert
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Abstract
A method for preparing a mixed-metal oxide catalyst comprising molybdenum, vanadium, at least one of niobium or tantalum, and at least one of tellurium or antimony and useful for the oxidative dehydrogenation of ethane to ethylene, the method comprising preparing a catalyst precursor, pressing the precursor into a dense pellet using a pressure of greater than about 5,000 psi, and annealing the pellet to form the mixed-metal oxide catalyst.
Claims26
A method for preparing a mixed-metal oxide catalyst, the method comprising:
- (a) preparing a catalyst precursor comprising molybdenum, vanadium, at least one of niobium or tantalum, and at least one of tellurium or antimony;
- (b) pressing the catalyst precursor into a dense pellet using a pressure of greater than about 5,000 psi;
- (c) annealing the dense pellet at a temperature of from about 525° C. to about 700° C. in a non-oxidative environment for a period of from about 0.5 hours to about 24 hours to form the mixed-metal oxide catalyst;
- and
- (d) optionally grinding the mixed-metal oxide catalyst into a fine powder and repeating steps (b) and (c).
A mixed-metal oxide catalyst for the oxidative dehydrogenation of ethane to ethylene, the catalyst prepared by the method comprising:
- (a) preparing a catalyst precursor comprising molybdenum, vanadium, at least one of niobium or tantalum, and at least one of tellurium or antimony;
- (b) pressing the catalyst precursor into a dense pellet using a pressure of greater than about 5,000 psi;
- (c) annealing the dense pellet at a temperature of from about 525° C. to about 700° C. in a non-oxidative environment for a period of from about 0.5 hours to about 24 hours to form the mixed-metal oxide catalyst;
- and
- (d) optionally grinding the mixed-metal oxide catalyst into a fine powder and repeating steps (b) and (c).
A method for the oxidative dehydrogenation of ethane to ethylene in the presence of a mixed-metal oxide catalyst, the catalyst prepared by the method comprising:
- (a) preparing a catalyst precursor comprising molybdenum, vanadium, at least one of niobium or tantalum, and at least one of tellurium or antimony;
- (b) pressing the catalyst precursor into a dense pellet using a pressure of greater than about 5,000 psi;
- (c) annealing the dense pellet at a temperature of from about 525° C. to about 700° C. in a non-oxidative environment for a period of from about 0.5 hours to about 24 hours to form the mixed-metal oxide catalyst;
- and
- (d) optionally grinding the mixed-metal oxide catalyst into a fine powder and repeating steps (b) and (c).
Dependencies are inferred from the claim text.