Claims
- 1. A catalyst composition comprising a metal oxide-promoted alumina and phosphorus oxide, wherein the metal of said metal oxide is molybdenum.
- 2. A catalyst composition according to claim 1 wherein the weight ratio of said phosphorus oxide to said metal oxide-promoted alumina is in the range of from about 0.0001:1 to about 1:1.
- 3. A catalyst composition according to claim 1, wherein the weight ratio of said phosphorus oxide to said metal oxide-promoted alumina is in the range of from 0.005:1 to 0.5:1.
- 4. A catalyst composition according to claim 1 wherein the weight percent of said metal oxide in said catalyst composition is in the range of from 1 to 40%.
- 5. A catalyst composition comprising a metal oxide-promoted alumina, an acid site modifier, and phosphorus oxide, wherein the metal of said metal oxide comprises molybdenum, wherein said acid site modifier is a silicon oxide, wherein the weight ratio of said silicon oxide to said metal oxide-promoted alumina is in the range of from about 0.0001:1 to 0.11:1.
- 6. A catalyst composition according to claim 5 wherein the weight ratio of said silicon oxide to said metal oxide-promoted alumina is in the range of from 0.005:1 to 0.11:1.
- 7. A catalyst composition consisting essentially of an alumina, a metal oxide, a silicon oxide, and a phosphorus oxide wherein the metal of said metal oxide is molybdenum; the weight percent of said silicon oxide in said composition is in the range of from 0.5 to 33%; the weight percent of said phosphorus oxide in said composition is in the range of from 0.5 to 33%; and the weight percent of said metal oxide in said composition is in the range of from about 0.1 to about 60%.
- 8. A catalyst composition made by a process comprising:(1) contacting an alumina with an acid site modifier precursor under a condition sufficient to incorporate said acid site modifier precursor into said alumina to form an acid site-modified alumina; (2) contacting said acid site-modified alumina with a phosphorus-containing compound and a metal compound under a condition sufficient to incorporate said phosphorus-containing compound and metal compound into said acid site-modified alumina to produce a modified alumina, wherein the metal of said metal compound is molybdenum; and (3) steam-treating said modified alumina under a condition sufficient to effect the conversion of said metal compound to its corresponding metal oxide wherein said acid site modifier precursor is a silicon-containing compound.
- 9. A catalyst composition according to claim 8 wherein said silicon-containing compound is selected from the group consisting of poly(phenylmethylsiloxane), poly(phenylethylsiloxane), poly(phenylproplsiloxane, hexamethyldisiloxane, decamethyltetrasiloxane, diphenyltetramethyldisiloxane, tetraethyl orthosilicate, tetrabutyl orthosilicate, tetrapropyl orthosilicate, trimethylchlorosilane, chloromethyldimethylchlorosilane, N-trimethylsilylimidazole, N,O-bis(trimethylsilyl)acetamide, N-methyl-N-trimethylsilyltrifluoroacetamide, t-butyldimethylsilylimidazole, N-trimethylsilylacetamide, methyltrimethoxysilane, vinyltriethoxysilane, ethyltrimethoxysilane, propyltrimethoxysilane, (3,3,3-trifluoropropyl)trimethoxysilane, [3-(2-aminoethyl)aminopropyl]trimethoxysilane, cyanoethyltrimethoxysilane, aminopropyltriethoxysilane, phenyltrimethoxysilane, (3-chloropropyl)trimethoxysilane, (3-mercaptopropyl)trimethoxysilane, (3-glycidoxypropyl)trimethoxysilane, vinyltris(β-methoxyethoxy)silane, (γ-methacryloxypropyl)trimethoxysilane, vinylbenzyl cationic silane, (4-aminoproyl)triethoxysilane, [γ-(β-aminoethylamino)propyl]trimethoxysilane, (γ-glycidoxypropyl)trimethoxysilane, [β-(3,4-epoxycyclohexyl)ethyl]trimethoxysilane, (β-mercaptoethyl)trimethoxysilane, (γ-chloropropyl)trimethoxysilane, and combinations of any two or more thereof.
- 10. A catalyst composition according to claim 9 wherein said phosphorus-containing compound is selected from the group consisting of phosphorus pentoxide, phosphorus oxychloride, phosphoric acid, P(OR)3, P(O)(OR)3, P(O)(R)(R)(R), P(R)(R)(R), and combinations of any two or more thereof wherein R has one to about 10 carbon atoms and is independently selected from the group consisting of an alkyl radical, an alkenyl radical, an aryl radical, an aralkyl radical, an alkaryl radical, and combinations of any two or more thereof.
- 11. A catalyst composition according to claim 10 wherein said metal compound is ammonium heptamolybdate.
- 12. A catalyst composition according to claim 11 wherein said acid site modifier precursor is poly(phenylmethylsiloxane).
- 13. A catalyst composition according to claim 12 wherein said phosphorus-containing compound is phosphoric acid.
- 14. A catalyst composition according to claim 11 wherein said phosphorus-containing compound is phosphoric acid.
- 15. A catalyst composition according to claim 8 wherein said phosphorus-containing compound is selected from the group consisting of phosphorus pentoxide, phosphorus oxychloride, phosphoric acid, P(OR)3, P(O)(OR)3, P(O)(R)(R)(R), P(R)(R)(R), and combinations of any two or more thereof wherein R has one to about 10 carbon atoms and is independently selected from the group consisting of an alkyl radical, an alkenyl radical, an aryl radical, an aralkyl radical, an alkaryl radical, and combinations of any two or more thereof.
- 16. A catalyst composition made by a process comprising the steps of:(1) contacting an alumina with an acid site modifier precursor under a condition sufficient to incorporate said acid site modifier precursor into said alumina to form an acid site-modified alumina; (2) contacting said acid site-modified alumina with a phosphorus-containing compound and a metal compound under a condition sufficient to incorporate said phosphorus-containing compound and metal compound into said acid site-modified alumina to produce a modified alumina and (3) treating said modified alumina with steam under a condition sufficient to effect the conversion of said metal compound to its corresponding metal oxide wherein said acid site modifier precursor is a silicon-containing compound and the metal of said metal compound is molybdenum.
- 17. A catalyst composition according to claim 16 wherein said silicon-containing compound is selected from the group consisting of poly(phenylmethylsiloxane), poly(phenylethylsiloxane), poly(phenylpropylsiloxane), hexamethyldisiloxane, decamethyltetrasiloxane, diphenyltetramethyldisiloxane, tetraethyl orthosilicate, tetrabutyl orthosilicate, tetrapropyl orthosilicate, trimethylehlorosilane, chloromethyldimethylchlorosilane, N-trimethylsilylimidazole, N,O-bis(trimethylsilyl)acetamide, N-methyl-N-trimethylsilyltrifluoroacetamide, t-butyldimethylsilylimidazole, N-trimethylsilylacetamide, methyltrimethoxysilane, vinyltriethoxysilane, ethyltrimethoxysilane, propyltrimethoxysilane, (3,3,3-trifluoropropyl)trimethoxysilane, [3-(2-aminoethyl)aminopropyl]trimethoxysilane, cyanoethyltrimethoxysilane, aminopropyltriethoxysilane, phenyltrimethoxysilane, (3-chloropropyl)trimethoxysilane, (3-mercaptopropyl)trimethoxysilane, (3-glycidoxypropyl)trimethoxysilane, , vinyltris(β-methoxyethoxy)silane, (γ-methacryloxypropyl)trimethoxysilane, vinylbenzyl cationic silane, (4-aminoproyl)triethoxysilane, [γ-(β-aminoethylamino)propyl]trimethoxysilane, [γ-glycidoxypropyl)trimethoxy silane, [β-(3,4-epoxycyclohexyl)ethyl]trimethoxysilane, (β-mercaptoethyl)trimethoxy silane, (γ-chloropropyl)trimethoxysilane, and combinations of any two or more thereof; andsaid phosphorus-containing compound is selected from the group consisting of phosphorus pentoxide, phosphorus oxychloride, phosphoric acid, P(OR)3, P(O)(OR)3, P(O)(R)(R)(R), P(R)(R)(R), and combinations of any two or more thereof wherein R has one to about 10 carbon atoms and is independently selected from the group consisting of an alkyl radical, an alkenyl radical, an aryl radical, an aralkyl radical, an alkaryl radical, and combinations of any two or more thereof.
- 18. A catalyst composition according to claim 16 wherein said metal compound is ammonium heptamolybdate; said acid site modifier precursor is poly(phenylmethylsiloxane); and said phosphorus-containing compound is phosphoric acid.
- 19. A catalyst composition made by a process comprising (1) contacting a silicon-containing compound with an alumina to produce a silicon-modified alumina; (2) contacting said silicon-modified alumina with a phosphorus-containing compound and a molybdenum-containing compound to produce a modified alumina; and (3) steam-treating said modified alumina.
- 20. A catalyst composition according to claim 19 wherein said molybdenum-containing compound is ammonium heptamolybdate; said phosphorus-containing is phosphoric acid; and said silicon-containing compound is polyphenylmethylsiloxane.
Parent Case Info
This application is a divisional of application Ser. No. 09/022,486, filed Feb. 12, 1998, now U.S. Pat. No. 6,037,302, which is a divional of application Ser. No. 08/764,366, filed Dec. 12, 1996, now U.S. Pat. No. 5,763,721.
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