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Large surface area oxidative dehydrogenation catalysts which are suitable for converting C 4 to C 8 mono-olefins to conjugated dienes are disclosed, comprising the oxides of vanadium, phosphorus, tin and potassium in combination with hydrogen mordenite having a surface area between 30 M 2 /g to 450

Large surface area oxidative dehydrogenation catalysts which are suitable for converting C 4 to C 8 mono-olefins to conjugated dienes are disclosed, comprising the oxides of vanadium, phosphorus, tin and potassium in combination with hydrogen mordenite having a surface area between 30 M 2 /g to 450 M 2 /g and wherein the vanadium has an average valence in the range of from 3.5 to 4.95.

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1. A method for producing diolefins from monolefins which comprises reacting a feedstream comprising a gas containing helium, molecular oxygen and a C 4 and C 8 mono-olefin under reaction conditions, in contact with an oxidative dehydrogenation catalyst defined by the formula: ##EQU##Me a V b P c Sn

1. A method for producing diolefins from monolefins which comprises reacting a feedstream comprising a gas containing helium, molecular oxygen and a C 4 and C 8 mono-olefin under reaction conditions, in contact with an oxidative dehydrogenation catalyst defined by the formula: ##EQU##Me a V b P c Sn d O e X wherein X is mordenite, Me is an alkali metal, a is 0.10 to 2, b is 0.10 to 1, c is 1, d is 0.001 to 0.30 and e is a number which satisfies the valence requirements of the other elements present. 2. The method defined in claim 1 wherein the alkali metal is a member selected from the group consisting of lithium, sodium, potassium, rubidium and cesium and mixtures thereof. 3. The method defined in claim 1 wherein the feedstream comprises a gas containing helium, molecular oxygen and a C 4 to C 8 mono-olefin in a molar ratio of from 0.1:1:0.001 to 4:1:0.03. 4. The method defined in claim 1 wherein the C 4 to C 8 mono-olefin is butene, pentene, cyclopentene, hexene, cyclohexene, heptene, cycloheptene, or octene or a mixture thereof. 5. The method defined in claim 1 wherein the reaction conditions comprise a temperature from 500° F. to 760° F., a pressure of from atmospheric pressure to 200 p.s.i.g., and a gas hourly space velocity of from 2,400 to 6,000 reciprocal hours. 6. A method for producing diolefins from mono-olefins which comprises reacting a feedstream comprising a gas containing helium, molecular oxygen and a C 4 to C 8 mono-olefin in the vapor phase, at a temperature of from 600° F. to 700° F., a pressure of from atmospheric pressure to 200 p.s.i.g., and a gas hourly space velocity of from 2,400 to 6,000 reciprocal hours in contact with an oxidative dehydrogenation catalyst described by the formula: ##EQU##Me a V b P c Sn d O e X wherein X is mordenite, Me is an alkali metal, a is 0.1 to 2, b is 0.10 to 1, c is 1,d is 0.001 to 0.30 and e is a number which satisfies the valence requirements of the other elements present. 7. The method defined in claim 6 wherein the alkali metal is a member selected from the group consisting of lithium, sodium, potassium, rubidium and cesium, and mixtures thereof. 8. The method defined in claim 6 wherein the feedstream comprises a gas containing helium, molecular oxygen and a C 4 to C 8 mono-olefin in a molar ratio of from 0.1:1:0.001 to 4:1:0.03. 9. The method defined in claim 6 wherein the C 4 to C 8 mono-olefin is butene, pentene, cyclopentene, hexene, cyclohexene, heptene, cycloheptene or octene or a mixture thereof. 10. A method for producing 1,3-butadiene which comprises reacting a feedstream comprising helium, air and butene in a molar ratio of from 0.1:1:0.001 to 4:1:0.03 in the vapor phase at a temperature of from 600° F. to 700° F., a pressure of from atmospheric pressure to 200 p.s.i.g. and a gas hourly space velocity of from 2,400 to 6,000 reciprocal hours, in contact with a dehydrogenation catalyst described by the formula: ##EQU##K a V b P c Sn d O e X wherein X is mordenite, a is 0.10 to 2, b is 0.10 to 1, c is 1, d is 0.001 to 0.30 and e is a number which satisfies the valence requirements of the other elements present. 11. A method for producing diolefins from mono-olefins which comprises reacting a feedstream comprising a gas containing molecular oxygen and a C 4 to C 8 mono-olefin under reaction conditions, in contact with a catalyst defined by the formula: ##EQU##Me a V b P c Sn d O e X wherein X is mordenite, Me is an alkali metal, a is 0.10 to 2, b is 0.10 to 1, C is 1, d is 0.001 to 0.30 and e is a number which satisfies the valence requirements of the other elements present. 12. The method defined in claim 11 wherein the alkali metal is a member selected from the group consisting of lithium, sodium, potassium, rubidium and cesium and mixtures thereof. 13. The method defined in claim 11 wherein the feedstream comprises a gas containing molecular oxygen and from about 0.1 to about 3 mole percent of a C 4 to C 8 mono-olefin. 14. The method defined in claim 11 wherein the reaction conditions comprise a temperature of from about 500° F. to about 760° F., a pressure of from atmospheric pressure to about 200 p.s.i.g., and a gas hourly space velocity of from about 2,400 to about 6,000 reciprocal hours. 15. The method defined in claim 11 wherein the C 4 to C 8 mono-olefin is butene, pentene, cyclopentene, hexene, cyclohexene, heptene, cycloheptene or octene or a mixture thereof. 16. A method for producing diolefins from mono-olefins which comprises reacting a feedstream comprising a gas containing molecular oxygen and a C 4 to C 8 mono-olefin in the vapor phase at a temperature of from about 600° F. to about 700° F., a pressure of from atmospheric pressure to about 200 p.s.i.g., and a gas hourly space velocity of from about 2,400 to about 6,000 reciprocal hours in contact with an oxidative dehydrogenative catalyst described by the formula: ##EQU##Me a V b P c Sn d O e X wherein X is mordenite, Me is an alkali metal, a is 0.1 to 2, b is 0.10 to 1, c is 1, d is 0.001 to 0.30 and e is a number which satisfies the valence requirements of the other elements present. 17. The method defined in claim 16 wherein the alkali metal is a member selected from the group consisting of lithium, sodium, potassium, rubidium and cesium and mixtures thereof. 18. The method defined in claim 16 wherein the feedstream comprises a gas containing molecular oxygen and from about 0.1 to about 3 mole percent of a C 4 to C 8 mono-olefin. 19. The method defined in claim 18 wherein the C 4 to C 8 mono-olefin is butene, pentene, cyclopentene, hexene, cyclohexene, heptene, cycloheptene or octene or a mixture thereof. 20. A method for producing diolefins which comprises contacting a C 4 to C 8 mono-olefin with a catalyst comprising an alkali metal, vanadium, phosphorus and mordenite. 21. The method defined in claims 20 wherein the catalyst includes tin. 22. The method defined in claim 20 including contacting the C 4 to C 8 mono-olefin with the catalyst in the presence of a gas containing molecular oxygen. 23. A method for producing diolefins which comprises contacting a C 4 to C 8 mono-olefin with a catalyst comprising an alkali metal, vanadium, phosphorus, tin and mordenite. 24. The method defined in claim 23 including contacting the C 4 to C 8 mono-olefin with the catalyst in the presence of a gas containing molecular oxygen. 25. A method for producing diolefins which comprises reacting a feedstream comprising a gas containing molecular oxygen and C 4 to C 8 mono-olefin in the vapor phase at a temperature of from about 500° F. to about 760° F., a pressure of from atmospheric pressure to about 200 p.s.i.g. and a gas hourly space velocity of from about 2,400 to about 6,000 reciprocal hours, in contact with a catalyst comprising an alkali metal, vanadium, phosphorus and tin in combination with mordenite. 26. The method defined in claim 25 wherein the C 4 to C 8 mono-olefin is butene, pentene, cyclopentene, hexene, cyclohexene, heptene, cycloheptene or octene or a mixture thereof. 27. The method defined in claim 25 wherein the feedstream comprises a gas containing molecular oxygen and from 0.1 to about 3 mole percent of a C 4 to C 8 mono-olefin.