Claims
- 1. A process for the preparation of methacrolein, which comprises oxidizing about 2-20 volume percent of isobutylene and/or tertiary butyl alcohol in the vapor-phase with about 4-20 volume percent molecular oxygen and up to about 30 volume percent steam at a temperature in the range of about 250.degree.-500.degree. C. and a pressure up to about 15.1 Kg/cm.sup.2 absolute in the presence of a catalyst composition consisting essentially of the oxides of molybdenum, cobalt, iron, bismuth, thallium, antimony, nickel, silicon, and a member of the group consisting of the alkali metals, alkaline earth metals, the rare earth metals including lanthanum, tungsten, and mixtures thereof, and having a BET surface area between about 0.5 and about 10 square meters per gram of catalyst.
- 2. A process as defined in claim 1 wherein said catalyst composition has been calcined in air at a temperature of at least about 525.degree. C. for a period of time sufficient to reduce the BET surface area to the defined values.
- 3. A process as defined in claim 1, wherein said catalyst composition has the formula Mo.sub.a Co.sub.b Fe.sub.c Bi.sub.d Tl.sub.e Sb.sub.f Si.sub.g Ni.sub.h X.sub.i where X is one or more members of said group of alkali metals, alkaline earth metals, rare earth metals including lanthanum, tungsten, and mixtures thereof, and where: a=12; b=0.2-8; c=0.5-5; d=0.2-4; e=0.01-5; f=0.01-5; g=1-20; h=0.05-5; i=a positive value up to 4; and j is dependent upon the valence and proportions of the other elements.
- 4. A process as defined in claim 1 wherein the BET surface area is between about 2 and about 6 square meters per gram of catalyst and no more than about 3% of the surface area of said catalyst is associated with pores having a diameter smaller than 100 Angstroms.
Parent Case Info
This is a continuation of application Ser. No. 327,848 filed Dec. 7, 1981, now U.S. Pat. No. 4,274,759, which is a continuation of application Ser. No. 939,645, filed Sept. 5, 1978, abandoned.
US Referenced Citations (9)
Continuations (2)
|
Number |
Date |
Country |
Parent |
327848 |
Dec 1981 |
|
Parent |
939645 |
Sep 1978 |
|