Claims
- 1. A process for producing a crystalline oxide of vanadium-phosphorus system, which comprises hydrothermally treating at a temperature of 110.degree.-250.degree. C. in a closed container an aqueous medium containing (1) a tetravalent vanadium compound, (2) a pentavalent phosphorus compound, (3) a coordinate compound having at least two ligand atoms selected from the group consisting of a polyhydric alcohol, and, a polybasic organic acid and (4) a compound of at least one metal element selected from the group consisting of iron, nickel, cobalt and chromium, to form a crystalline oxide of vanadium-phosphorus system having a X-ray diffraction pattern shown in Table A:
- TABLE A______________________________________X-ray diffraction peaks(Anticathode: Cu--K.alpha.)2.theta. (.+-.0.2.degree.)______________________________________15.6.degree. 19.7.degree. 24.3.degree.27.2.degree. 28.8.degree. 30.5.degree. 33.8.degree.______________________________________
- wherein the coordinate compound is used in a molar ratio of from 0.01 to 1.0 to vanadium, the atomic ratio of phosphorus/vanadium is from 0.5 to 2.0, and the atomic ratio of the compound of at least one metal element to vanadium is from 0.001 to 1.0.
- 2. The process according to claim 1, wherein the tetravalent vanadium compound is obtained by reducing a pentavalent vanadium compound with a reducing agent.
- 3. The process according to claim 1, wherein the tetravalent vanadium compound and the pentavalent phosphorus compound are obtained by the oxidation reduction reaction of a pentavalent vanadium compound with a trivalent phosphorus compound.
- 4. The process according to claim 1, wherein the compound of the metal element is selected from the group consisting of inorganic and organic salts of iron, cobalt, nickel and chromium.
- 5. The process according to claim 1, wherein the polyhydric alcohol is selected from the group consisting of ethylene glycol, 1,4-butanediol, 2,4-pentanediol and pinacol.
- 6. The process according to claim 1, wherein the polybasic organic acid is selected from the group consisting of tartaric acid, oxalic acid and ethylenediamine tetraacetic acid.
- 7. The process according to claim 1, wherein the coordinate compound is used in a molar ratio of from 0.1 to 0.5 to vanadium.
- 8. A process for producing a catalyst containing a crystalline oxide of vanadium-phosphorus system, which comprises shaping the crystalline oxide of vanadium-phosphorus system as defined in claim 1 into a catalyst form.
- 9. A process for producing a crystalline oxide of vanadium-phosphorus system, which comprises calcining at a temperature of from 400.degree. to 600.degree. C. a crystalline oxide of vanadium-phosphorus system obtained by hydrothermally treating at a temperature of 110.degree.-250.degree. C. in a closed container an aqueous medium containing (1) a tetravalent vanadium compound, (2) a pentavalent phosphorus compound, (3) a coordinate compound having at least two ligand atoms selected from the group consisting of a polyhydric alcohol, and, a polybasic organic acid and (4) a compound of at least one metal element selected from the group consisting of iron, nickel, cobalt and chromium, to form a crystalline oxide of vanadium-phosphorus system having a X-ray diffraction pattern shown in Table A:
- TABLE A______________________________________X-ray diffraction peaks(Anticathode: Cu--K.alpha.)2.theta. (.+-.0.2.degree.)______________________________________15.6.degree. 19.7.degree. 24.3.degree.27.2.degree. 28.8.degree. 30.5.degree. 33.8.degree.______________________________________
- to form a crystalline oxide of vanadium-phosphorus system having an X-ray diffraction pattern shown in Table B:
- TABLE B______________________________________X-ray diffraction peaks(Anticathode: Cu--K.alpha.)______________________________________14.2.degree. 15.7.degree. 18.5.degree.23.0.degree. 28.4.degree. 30.0.degree.33.7.degree. 36.8.degree.______________________________________
- wherein the coordinate compound is used in a molar ratio of from 0.01 to 1.0 to vanadium, the atomic ratio of phosphorus/vanadium is from 0.5 to 2.0, and the atomic ratio of the compound of at least one metal element to vanadium is from 0.001 to 1.0.
- 10. The process according to claim 9, wherein the tetravalent vanadium compound is obtained by reducing a pentavalent vanadium compound with a reducing agent.
- 11. The process according to claim 9, wherein the tetravalent vanadium compound and the pentavalent phosphorus compound are obtained by the oxidation reduction reaction of a pentavalent vanadium compound with a trivalent phosphorus compound.
- 12. The process according to claim 9, wherein the compound of the metal element is selected from the group consisting of inorganic and organic salts of iron, cobalt, nickel and chromium.
- 13. The process according to claim 9, wherein the polyhydric alcohol is selected from the group consisting of ethylene glycol, 1,4-butanediol, 2,4-pentanediol and pinacol.
- 14. The process according to claim 9, wherein the polybasic organic acid is selected from the group consisting of tartaric acid, oxalic acid and ethylenediamine tetraacetic acid.
- 15. The process according to claim 9, wherein the coordinate compound is used in a molar ratio of from 0.1 to 0.5 to vanadium.
- 16. A process for producing a catalyst containing a crystalline oxide of vanadium-phosphorus system, which comprises calcining at a temperature of from 400.degree. to 600.degree. C. a crystalline oxide of vanadium-phosphorus system obtained by hydrothermally treating at a temperature of 110.degree.-250.degree. C. in a closed container an aqueous medium containing (1) a tetravalent vanadium compound, (2) a pentavalent phosphorus compound, (3) a coordinate compound having at least two ligand atoms selected from the group consisting of a polyhydric alcohol, and, a polybasic organic acid and (4) a compound of at least one metal element selected from the group consisting of iron, nickel, cobalt and chromium, to form a crystalline oxide of vanadium-phosphorus system having a X-ray diffraction pattern shown in Table A:
- TABLE A______________________________________X-ray diffraction peaks(Anticathode: Cu--K.alpha.)2.theta. (.+-.0.2.degree.)______________________________________15.6.degree. 19.7.degree. 24.3.degree.27.2.degree. 28.8.degree. 30.5.degree. 33.8.degree.______________________________________
- to form a crystalline oxide of vanadium-phosphorus system having an X-ray diffraction pattern shown in Table B:
- TABLE B______________________________________X-ray diffraction peaks(Anticathode: Cu--K.alpha.)______________________________________14.2.degree. 15.7.degree. 18.5.degree.23.0.degree. 28.4.degree. 30.0.degree.33.7.degree. 36.8.degree.______________________________________
- and then shaping the crystalline oxide into a catalyst form, wherein the coordinate compound is used in a molar ratio of from 0.01 to 1.0 to vanadium, the atomic ratio of phosphorus/vanadium is from 0.5 to 2.0, and the atomic ratio of the compound of at least one metal element to vanadium is from 0.001 to 1.0.
Priority Claims (2)
Number |
Date |
Country |
Kind |
63-249953 |
Oct 1988 |
JPX |
|
1-205570 |
Aug 1989 |
JPX |
|
Parent Case Info
This is a division of application Ser. No. 07/414,313, filed on Sep. 29, 1989, now U.S. Pat. No. 5,021,384.
US Referenced Citations (10)
Foreign Referenced Citations (2)
Number |
Date |
Country |
71544 |
Apr 1987 |
JPX |
2118060 |
Oct 1983 |
GBX |
Divisions (1)
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Number |
Date |
Country |
Parent |
414313 |
Sep 1989 |
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