High Pore Volume VPO Catalyst for Maleic Anhydride Production
AssigneeHuntsman Petrochemical Corporation
InventorZhiping Shan
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Abstract
Embodiments of the present invention disclose improved micro-pore catalyst structures containing catalytic material comprised of mixed oxides of vanadium and phosphorus and using such improved micro-pore catalyst structures for the production of maleic anhydride.
Claims15
A catalyst for the catalytic oxidation of hydrocarbons to produce a carboxylic acid anhydride comprising an active VPO catalyst, wherein the active VPO catalyst is characterized by:
- (i) having a total pore volume, micro-pores and a micro-pore volume, wherein the micro-pores are pores on the active VPO catalyst that each have a pore diameter of 0.6 microns or less;
- (ii) optionally having macro-pores, wherein the macro-pores are pores on the active VPO catalyst that each have an individual pore diameter from above 0.6 microns to 10 microns;
- (iii) the micro-pore volume is at least 0.2 cc/g and comprises at least about 55% of the total pore volume;
- and
- (iv) the total pore volume is at least 0.27 cc/g.
A process for preparing maleic anhydride comprising reacting a hydrocarbon having at least four carbons in a straight chain with a molecular oxygen-containing gas in the presence of an active VPO catalyst having a micro-pore volume of at least 0.2 cc/g.
Maleic anhydride produced by the process of reacting a hydrocarbon having at least four carbons in a straight chain with a molecular oxygen-containing gas in the presence of an active VPO catalyst, wherein the active VPO catalyst is characterized by:
- (i) having a total pore volume, micro-pores and a micro-pore volume, wherein the micro-pores are pores on the active VPO catalyst that each have a pore diameter of 0.6 microns or less;
- (ii) optionally having macro-pores, wherein the macro-pores are pores on the active VPO catalyst that each have an individual pore diameter from above 0.6 microns to 10 microns;
- (iii) the micro-pore volume is at least 0.2 cc/g and comprises at least about 55% of the total pore volume;
- and
- (iv) the total pore volume is at least 0.27 cc/g.
Dependencies are inferred from the claim text.