Catalyst for making acrolein
AssigneeThe Dow Chemical Company
InventorsDavid L. Childress, William V. Hayes, Richard L. Poppe
Life of this patent
Estimating the term…
Abstract
A method of preparing acrolein and methacrolein by oxidation of propylene and isobutylene over a new improved catalyst providing conversions and yields, each greater than 90% in a single-pass reactor. The improved catalyst contains within certain prescribed proportions the oxides of cobalt, iron, bismuth, molybdenum, potassium, and optionally silicon. The metals have atomic ratios of Co.sub.3-10 Fe.sub.0.5-3.0 Bi.sub.0.5-3.0 Mo.sub.15 K.sub.0.01-0.5 Si.sub.0.5-3.0 and are present in the form of oxides as pellets, spheres, or on a support. With a recycle system, a conversion of the olefin greater than 99% and yield to the aldehyde of greater than 95% are possible.
Claims9
An improved catalyst for the oxidation of a lower olefin containing 3 to 6 carbon atoms to the analogous unsaturated aldehyde which consists essentially of oxides of cobalt, iron, bismuth, molybdenum and potassium wherein the atomic ratios of the metals are within the ranges
- Co.sub.4.5-7.0 Fe.sub.1-2 Bi.sub.1-2 Mo.sub.15 K.sub.0.05-0.2.
A method for making an improved oxidation catalyst pellet containing oxides of cobalt, iron, bismuth, molybdenum, and potassium which comprises:
- 1. making a first solution of the compounds of cobalt, iron and bismuth,
- 2. making a second solution of the compounds of molybdenum and potassium,
- 3. mixing thoroughly said first and second solutions,
- 4. removing excess water until a moldable clay-like mixture is produced,
- 5. forming said clay-like mixture into a mold to produce catalyst particles,
- 6. drying the molded catalyst in the mold,
- 7. removing the dried catalyst from the mold and calcining it in air for a period of about 6 hours, wherein the calcination temperature is gradually increased from about 200.degree. C to about 500.degree. C during the first hour and the temperature is maintained at about 500.degree. C for the remaining time,
- 8. cooling the so-formed oxidation catalyst prior to use.
A method for making an improved supported oxidation catalyst which contains the oxides of cobalt, iron, bismuth, molybdenum and potassium which comprises:
- 1. making a first solution of the compounds of cobalt, iron and bismuth,
- 2. absorbing said first solution on a catalyst support,
- 3. drying said support containing the adsorbed first solution,
- 4.
Dependencies are inferred from the claim text.