Claims
- 1. A solid heterogeneous catalyst composition capable of providing a reactive form of oxygen comprising (a) a support component of magnesia and at least one aluminum oxide selected from the group consisting of alumina (Al.sub.2 O.sub.3) and magnesium aluminate (MgAl.sub.2 O.sub.4), the support having a MgO/Al.sub.2 O.sub.3 weight ratio in the range from about 0.3 to about 4.0 and a surface area of at least about 25 m.sup.2 /g; and (b) a catalyst component consisting essentially of an oxide of magnesium, an oxide of molybdenum, and a promoting amount of a Group IA alkali metal promoter.
- 2. The catalyst of claim 1 wherein the molybdenum oxide concentration ranges from about 3 weight percent MoO.sub.3 to about 50 weight percent MoO.sub.3 based on the total weight of the aluminum, magnesium and molybdenum oxides.
- 3. The catalyst of claim 2 wherein the molybdenum oxide concentration ranges from about 10 weight percent MoO.sub.3 to about 30 weight percent MoO.sub.3 based on the total weight of the aluminum, magnesium and molybdenum oxides.
- 4. The catalyst of claim 1 wherein the MgO/Al.sub.2 O.sub.3 weight ratio ranges from about 0.3 to about 2.0.
- 5. The catalyst of claim 1 wherein the concentration of the alkali metal promoter ranges from about 0.05 weight percent to about 5 weight percent calculated as alkali metal hydroxide and based on the total weight of the aluminum, magnesium and molybdenum oxides.
- 6. The catalyst of claim 1 wherein the alkali metal promoter concentration ranges from about 0.1 weight percent to about 2 weight percent.
- 7. The catalyst of claim 1 wherein the alkali metal promoter concentration ranges from about 0.3 weight percent to about 1.5 weight percent.
- 8. The catalyst of claim 1 wherein the alkali metal promoter is an alkali metal oxide, hydroxide, carbonate, acetate, or oxalate.
- 9. The catalyst of claim 8 wherein the alkali metal promoter is an oxide or hydroxide of potassium or cesium.
- 10. The catalyst of claim 9 wherein the alkali metal promoter is an oxide or hydroxide of potassium.
- 11. The catalyst of claim 1 having an attrition number less than about 5 weight percent hr.sup.-1.
- 12. The catalyst of claim 11 having an attrition number less than about 1 weight percent hr.sup.-1.
- 13. The catalyst of claim 1 having a crush strength of at least about 5 lb.
- 14. The catalyst of claim 13 having a crush strength of at least about 15 lb.
- 15. The catalyst of claim 1 having a particle size in the range from about 500 .mu.m to about 1200 .mu.m.
- 16. A solid heterogeneous catalyst composition capable of providing a reactive form of oxygen comprising (a) a support component of magnesia and at least one aluminum oxide selected from the group consisting of alumina (Al.sub.2 O.sub.3) and magnesium aluminate (MgAl.sub.2 O.sub.4), the support having a MgO/Al.sub.2 O.sub.3 weight ratio in the range from about 0.3 to about 4.0 and a surface area of at least about 25 m.sup.2 /g; and (b) a catalyst component consisting essentially of an oxide of magnesium, an oxide of molybdenum, an oxide of vanadium and a promoting amount of a Group IA alkali metal promoter.
- 17. The composition of claim 1 wherein the support component has a surface area in the range from about 50 m.sup.2 /g to about 250 m.sup.2 /g.
- 18. The composition of claim 1 having a particle size in the range from about 200 .mu.m to about 1700 .mu.m.
- 19. The composition of claim 1 wherein the aluminum oxide is a pre-formed magnesium aluminate spinel.
- 20. The composition of claim 1 wherein the aluminum oxide is in the form of pre-formed alumina spheres having a particle size in the range from about 500 .mu.m to about 1000 .mu.m.
- 21. The catalyst of claim 1 prepared by a process comprising (a) forming a gel from a mixture of colloidal alumina and magnesia, the MgO/Al.sub.2 O.sub.3 weight ratio being in the range between 0.3 and 4.0, (b) drying the gel to form a powder, (c) calcining the powder to form a support having a surface area of at least about 25 m.sup.2 /g, (d) impregnating the support with a solution of a molybdenum salt and a Group IA alkali metal promoter, and (e) calcining the impregnated support to obtain a supported catalytic component comprising an oxide of magnesium, an oxide of molybdenum, and an oxide of an alkali metal.
CROSS-REFERENCE TO RELATED APPLICATION
This is a divisional of application Ser. No. 505,751 filed Apr. 6, 1990, now U.S. Pat. No. 5,146,031 which is a continuation-in-part of application Ser. No. 383,107, filed Jul. 20, 1989 now U.S. Pat. No. 4,973,791.
US Referenced Citations (32)
Non-Patent Literature Citations (5)
Entry |
Derwent 06949C/04 (1980). |
Derwent 75459 E/36 (1982). |
Chemical Abstracts 104:131946b (1986). |
Derwent 86-316078/48. |
Derwent 85-232465/38. |
Divisions (1)
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Number |
Date |
Country |
Parent |
505751 |
Apr 1990 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
383107 |
Jul 1989 |
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