Claims
- 1. In a process for catalytically oxidizing isobutylene in the gas phase with molecular oxygen at a temperature of 200.degree. to 450.degree. C. to methacrolein and methacrylic acid, the improvement comprising: oxidizing isobutylene over a calcined catalyst consisting essentially of:
- Mo.sub.a Sb.sub.b Bi.sub.c Fe.sub.d Ni.sub.e Sn.sub.g X.sub.h Y.sub.i O.sub.j
- wherein X is at least one metal selected from the group consisting of potassium, rubidium, cesium and thallium, and Y is at least one metal selected from the group consisting of magnesium, chromium, manganese, zinc, niobium, cadmium and tantalum, wherein subscripts a to j are the atomic ratios of each component and a is 12, b=0.2 to 20, c=0.2 to 12, d=0.2 to 12, e=0.2 to 12, g=0 to 20, h=0.01 to 4, i.=0.01 to 4, and j is a value determined by the valencies of the elements in the catalyst.
- 2. The process of claim 1, wherein Y is magnesium.
- 3. The process of claim 1, wherein Y is a combination of magnesium and zinc.
- 4. The process of claim 1, wherein Y is at least one metal selected from the group consisting of chromium, manganese, zinc, niobium, cadmium and tantalum.
- 5. The process of claim 4, wherein Y is zinc.
- 6. The process of claim 4, wherein Y is a combination of zinc and manganese.
Priority Claims (3)
Number |
Date |
Country |
Kind |
50/30313 |
Mar 1975 |
JPX |
|
50/39452 |
Mar 1975 |
JPX |
|
50/82982 |
Jul 1975 |
JPX |
|
Parent Case Info
This is a divison, of application Ser. No. 741,508, filed Nov. 12, 1976, now U.S. Pat. No. 4,111,985 which is a divisional of application Ser. No. 663,365, filed Mar. 3, 1976, now U.S. Pat. No. 4,035,418.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
3642930 |
Grasselli et al. |
Feb 1972 |
|
4001317 |
Grasselli et al. |
Jan 1977 |
|
Divisions (2)
|
Number |
Date |
Country |
Parent |
741508 |
Nov 1976 |
|
Parent |
663365 |
Mar 1976 |
|