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US 2018/0001307 A1Published application
Gold-based catalyst for the oxidative esterification of aldehydes to obtain carboxylic esters
AssigneeEvonik Roehm GmbH
InventorsAlexander LYGIN, Steffen KRILL, Matthias GROEMPING, Andreas TEPPERIS
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Abstract
Catalysts for oxidative esterification can be used, for example, fro converting (meth)acrolein to methyl (meth)acrylate. The catalysts are especially notable for high mechanical and chemical stability even over very long time periods, including activity and/or selectivity relatively in continuous operation in media having even a small water content.
Claims16
A hydrolysis-resistant catalyst, comprising:
- a) 0.01 to 10 mol % of gold,
- b) 40 to 94 mol % of silicon,
- c) 3 to 40 mol % of aluminium, and
- d) 2 to 40 mol % of at least one element selected from the group consisting of alkali metals, alkaline earth metals, lanthanoids having atomic numbers 57 to 71, Y, Sc, Ti, Zr, Cu, Mn, Pb and Bi,
- wherein components b) to d) are present as oxides and the stated amounts of components a) to d) relate to 100 mol % of the composition of the catalyst without oxygen,
- wherein the catalyst is in the form of particles and is suitable for the oxidative esterification of aldehydes to carboxylic esters,
- wherein the catalyst has a shell structure comprising a core and at least one shell, where at least 80% of the total amount of component a) is part of a shell, and
- wherein the catalyst has a PZC value between 7 and 11.
5 more elements
A process for producing catalyst particles, wherein admixing a basic mixed oxide support with a gold-containing solution to form a component a) having a pH between 0.5 and 5.0,
- wherein the basic mixed oxide support has a PZC value between 8 and 12 and a mean diameter between 10 and 200 μm, consists of b) 40 to 94 mol % of silicon, c) 3 to 40 mol % of aluminium and d) 2 to 40 mol % of at least one element selected from alkali metals, alkaline earth metals, rare earth metals, Ti, Zr, Cu, Mn, Pb and Bi,
- wherein components b) to d) are present as oxides and the stated amounts of components a) to d) relate to 100 mol % of the composition of the catalyst without oxygen.
Dependencies are inferred from the claim text.