Process for the preparation of MFI-type zeolitic catalysts
AssigneePolimeri Europa S.p.A.
InventorsLuigi Balducci, Leonardo Dalloro, Alberto Cesana, Roberto Buzzoni
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Abstract
The present invention relates to a process for the preparation of zeolitic catalysts of the MFI type in spheroidal form. The process consists in emulsifying and consolidating in paraffinic hydrocarbons, in the presence of a non-ionic surface-active agent or a suitable combination of a non-ionic surface-active agent and a cationic surface-active agent, a dispersion of particles of zeolitic material of the MFI type in a silica sol.
Claims18
A method for the preparation in gas phase of an amide, comprising catalytic arrangement of an oxime in the presence of a catalytic composition, wherein the catalytic composition is based on an MFI-type zeolite in the form of microspheres with an average diameter ranging from 30 to 200 μm, containing a quantity of silica ligand ranging from 15 to 20% by weight, having a resistance to attrition, expressed as Davison Index<6.0, and wherein the catalytic composition is obtained by a process comprising:
- a) hydrolyzing silicon alkoxides in an aqueous medium and under acid conditions, thereby forming a silica sol;
- b) mixing the silica sol with an aqueous dispersion of MFI-type zeolite particles;
- c) adjusting the pH of the hybrid silica sol obtained in step (b) to a pH value not higher than 6.0;
- and
- d) emulsifying/gelating the hybrid sol in paraffinic, cycloparaffinic or aromatic hydrocarbons, in the presence of a non-ionic surface-active agent or a suitable combination of a non-ionic and cationic surface-active agent,
- wherein the amide is ε-caprolactam and the oxime is cyclohexanone-oxime.
Dependencies are inferred from the claim text.