Preparation of mixed metal oxide catalysts for catalytic oxidation of olefins to unsaturated aldehydes
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01J-023/00
B01J-027/192
B01J-021/08
B01J-021/12
B01J-021/14
출원번호
US-0317647
(2002-12-12)
발명자
/ 주소
Stevenson, Scott A.
Liang, Wugeng
출원인 / 주소
Saudi Basic Industries Corporation
인용정보
피인용 횟수 :
10인용 특허 :
40
초록▼
A process for making a catalyst containing oxides of molybdenum, bismuth, iron, cesium and, optionally, other metals, such as tungsten, cobalt, nickel, antimony, magnesium, zinc, phosphorus, potassium, rubidium, thallium, manganese, barium, chromium, boron, sulfur, silicon, aluminum, titanium, ceriu
A process for making a catalyst containing oxides of molybdenum, bismuth, iron, cesium and, optionally, other metals, such as tungsten, cobalt, nickel, antimony, magnesium, zinc, phosphorus, potassium, rubidium, thallium, manganese, barium, chromium, boron, sulfur, silicon, aluminum, titanium, cerium, tellurium, tin, vanadium, zirconium, lead, cadmium, copper and niobium wherein metal compounds are dissolved and then precipitated as a catalyst precursor which is calcined to form a mixed metal oxide catalyst. The process of the present invention uses an organic acid, such as acetic acid, instead of nitric acid to dissolve the bismuth compound and, optionally, other metal compounds. The catalyst synthesized by this process may be used for the production of unsaturated aldehydes, such as methacrolein, by gas phase catalytic oxidation of olefins, such as isobutylene.
대표청구항▼
1. A process for preparing a catalyst for the oxidation of an olefin to an unsaturated aldehyde comprising:a) dissolving a bismuth compound to form a solution or a slurry in an organic acid; b) bringing the bismuth compound in contact with a molybdenum compound, an iron compound, and a cesium compou
1. A process for preparing a catalyst for the oxidation of an olefin to an unsaturated aldehyde comprising:a) dissolving a bismuth compound to form a solution or a slurry in an organic acid; b) bringing the bismuth compound in contact with a molybdenum compound, an iron compound, and a cesium compound in the solution or slurry; c) removing liquid from the solution or the slurry to form a solid; d) drying the solid; and e) calcining the solid to form oxides of the metals to form a catalyst having the general formula: Mo12BiaFecCsgOx wherein a is in the range from 0.1 to 1.5, c is in the range from 0.2 to 5.0, g is in the range from 0.1 to 1.5 and x is determined by the valences of the other components.2. The process of claim 1 wherein the organic acid has the general formulae: where R is an alkyl group of one to six carbon atoms, an aryl group of six to ten carbon atoms, an alkylhydroxy group of one to six carbon atoms or an alkylhalide group of one to six carbon atoms, R′ is an alkyl group of one to six carbon atoms or an aryl group of six to ten carbon atoms and n is 1 or 0 indicating whether the R′ group is present or not.3. The process of claim 2 wherein the organic acid is acetic acid, formic acid, citric acid, oxalic acid, benzoic acid, phthalic acid, lactic acid, malonic acid, adipic acid or chloroacetic acid.4. The process of claim 3 wherein the organic acid is acetic acid.5. The process of claim 1 wherein the molybdenum compound is an ammonium salt.6. The process of claim 1 further comprising bringing the bismuth compound in contact with a tungsten compound.7. The process of claim 6 wherein the tungsten compound is an ammonium salt.8. The process of claim 1 wherein the bismuth compound is a nitrate.9. The process of claim 1 wherein the iron compound is a nitrate.10. The process of claim 1 further comprising bringing the bismuth compound in contact with a cobalt compound.11. The process of claim 10 wherein the cobalt compound is a nitrate.12. The process of claim 1 further comprising bringing the bismuth compound in contact with a nickel compound.13. The process of claim 12 wherein the nickel compound is a nitrate.14. The process of claim 1 further comprising bringing the bismuth compound in contact with an antimony compound.15. The process of claim 14 wherein the antimony compound is an oxide.16. The process of claim 1 wherein the cesium compound is a nitrate.17. The process of claim 1 further comprising bringing the bismuth compound in contact with a zinc compound.18. The process of claim 17 wherein the zinc compound is a nitrate.19. The process of claim 1 further comprising bringing the bismuth compound in contact with one or more compound of M wherein M is selected from the group consisting of tungsten, cobalt, nickel, antimony, magnesium, zinc, phosphorus, potassium, rubidium, thallium, manganese, barium, chromium, boron, sulfur, silicon, aluminum, titanium, cerium, tellurium, tin, vanadium, zirconium, lead, cadmium, copper and niobium and wherein the catalyst has a formula:Mo12BiaFecCsgMmOx wherein m is 0 to 9.20. The process of claim 19 wherein the catalyst has a formula:Mo12BiaWbFecCodNieSbfCsgMghZniPjOx wherein a is 0.1 to 1.5, b is 0 to 4, c is 0.2 to 5.0, d is 0 to 9, e is 0 to 9, f is 0 to 2.0, g is 0.4 to 1.5, h is 0 to 1.5, i is 0 to 2.0, j is 0 to 0.5.21. The process of claim 20 wherein the bismuth compound, the iron compound, the cobalt compound, the nickel compound, the magnesium compound and the zinc compound are dissolved in an organic acid to form a solution.22. The process of claim 21 wherein the solution containing the bismuth compound, the iron compound, the cobalt compound, the nickel compound, the magnesium compound and the zinc compound are mixed with the solution containing the molybdenum compound, the tungsten compound and the phosphorus compound to form a slurry.23. The process of claim 22 wherein the cesium compound is added as a solid to the slurry.24. The process of claim 23 wherein the antimony compound is added as a solid to the slurry.25. The process of claim 24 wherein the slurry is aged for 0 to 24 hours.26. The process of claim 25 wherein the slurry is aged for 8 to 18 hours.27. The process of claim 26 wherein the slurry is aged for 10 hours.28. The process of claim 25 wherein the slurry is stirred during aging.29. The process of claim 25 wherein the slurry is maintained at a temperature of 60 to 100° C. during aging.30. The process of claim 20 wherein the catalyst has an X-ray diffraction pattern having substantial diffraction peaks at the diffraction angles of 2θ, measured by using Cu Kα radiation, at 25.5, 26.6 and 28.0.31. The process of claim 20 wherein the catalyst is unsupported and has a surface area of from 0.1 to 150 m2/g.32. The process of claim 31 wherein the catalyst has a surface area of from 1 to 20 m2/g.33. The process of claim 19 wherein the molybdenum compound, the tungsten compound and the phosphorus compound are dissolved in water to form a solution.34. The process of claim 1 wherein the liquid is removed by evaporation at a temperature of 75 to 125° C.35. The process of claim 1 wherein the liquid is removed by filtration.36. The process of claim 1 wherein the liquid is removed by centrifuge.37. The process of claim 1 wherein the liquid is removed and the solid dried by spray drying.38. The process of claim 1 wherein the solid is dried 100° to 150° C. for 2 to 5 hours.39. The process of claim 1 wherein the solid is calcined at 200-600° C. for 1-12 hours.40. The process of claim 39 wherein the solid is calcined in two stages, the first stage at a temperature of 150-400° C. for 1-5 hours and the second state at a temperature of 460-600° C. for 4-8 hours.41. The process of claim 40 wherein the solid is calcined in the first stage at a temperature of 300° C. for 2 hours and in second stage at a temperature of 500° C. for 6 hours.42. The process of claim 1 wherein the catalyst is supported on an inert support.43. The process of claim 42 wherein the inert support is silica, alumina, niobia, titania, zirconia or mixtures thereof.44. The process of claim 1 wherein the catalyst is formed into powder, granules, spheres, cylinders or saddles.45. A process for preparing a catalyst for the oxidation of isobutylene to methacrolein comprising:a) dissolving bismuth nitrate to form a solution or a slurry in acetic acid; b) bringing the bismuth nitrate in contact with a molybdenum compound selected from the group consisting of ammonium paramolybdate and ammonium molybdate, a tungsten compound selected from the group consisting of ammonium paratungstate and ammonium tungstate, iron nitrate, cobalt nitrate, nickel nitrate, cesium nitrate, magnesium nitrate, zinc nitrate, phosphoric acid and an antimony compound selected from the group consisting of antimony oxide and antimony trioxide; c) removing liquid from the solution or the slurry to form a solid; d) drying the solid; and e) calcining the solid at a temperature to form oxides of the metals to form a catalyst having the general formula Mo12BiaWbFecCodNieSbfCsgMghZniPjOx wherein a is 0.1 to 1.5, b is 0 to 4, c is 0.2 to 5.0, d is 0 to 9, e is 0 to 9, f is 0 to 2.0, g is 0.4 to 1.5, h is 0 to 1.5, i is 0 to 2.0, j is 0 to 0.5.46. The process of claim 45 wherein g is 0.4 to 0.6 and the calcination temperature is 460° C. to 480° C.47. The process of claim 45 wherein h is 0.48. The process of claim 47 wherein the calcination temperature is 460° C. to 480° C.49. The process of claim 45 wherein j is 0.05 to 0.15.50. The process of claim 49 wherein the calcination temperature is 460° C. to 480°.
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