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 Cs.sub.e Re.sub.f O.sub.g, where: a=12; b=0.05-3; c=0.1-5; d=0.01-1; e=0.1-3; f=0.005-0.5; and g=value determined by the valence and proportions of the other elements of the formula.
- 2. A process as defined in claim 1, where c=0.5-3.
CROSS-REFERENCE TO OTHER APPLICATIONS
This is a division of application Ser. No. 047,860 filed June 12, 1979, now U.S. Pat. No. 4,377,501, which is a continuation-in-part of application Ser. No. 973,354, filed Dec. 12, 1978, now U.S. Pat. No. 4,374,757, which is a continuation-in-part of Ser. No. 972,745, filed Dec. 26, 1978, now U.S. Pat. No. 4,252,682, which is a continuation-in-part of application Ser. No. 973,495, filed Dec. 26, 1978, now U.S. Pat. No. 4,252,683.
US Referenced Citations (6)
Divisions (1)
|
Number |
Date |
Country |
Parent |
47860 |
Jun 1979 |
|
Continuation in Parts (3)
|
Number |
Date |
Country |
Parent |
973354 |
Dec 1978 |
|
Parent |
972745 |
Dec 1978 |
|
Parent |
973495 |
Dec 1978 |
|