Claims
- 1. A process for the preparation of methacrylic acid which comprises oxidizing methacrolein in the vapor-phase with molecular oxygen in the presence of a catalyst composition having the formula Mo.sub.a Cu.sub.b P.sub.c Sb.sub.d Ca.sub.e O.sub.f where a=12; b=0.05-3; c=0.1-5; d=0.01-3; e=0.1-6; f=value determined by the valence and proportions of the other elements of the formula.
Parent Case Info
This is a division of application Ser. No. 972,745, filed Dec. 26, 1978, now U.S. Pat. No. 4,252,682.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4000088 |
Shimizu et al. |
Dec 1976 |
|
4045478 |
Umemura et al. |
Aug 1977 |
|
Divisions (1)
|
Number |
Date |
Country |
Parent |
972745 |
Dec 1978 |
|