Process for preparing bound zeolites
AssigneeEnichem S.p.A.
InventorsAngela Carati, Giuseppe Bellussi, Maria Angela Mantegazza, Guido Petrini
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Abstract
A process is described for the preparation of zeolitic catalysts in the form of microspheres, comprising zeolite and oligomeric silica, characterized by a high mechanical resistance. The process consists in subjecting to rapid drying the suspension, to which tetra-alkylorthosilicate is optionally added, resulting from the synthesis of zeolite by hydrothermal treatment at autogenous pressure of the reagent mixture containing tetra-alkylammoniumhydroxide as templating agent, and subjecting the product resulting from the drying to calcination.
Claims6
A process for preparing zeolites of the MFI group having the formula a Al2O3·(1-a)SiO2, wherein a has a value ranging from 0 to 0.02, which comprises:
- subjecting to hydrothermal treatment at autogenous pressure, at a temperature ranging from 190 to 230° C. and for a time ranging from 0.5 to 10 hours, without alkali metals, a mixture containing a silicon source, optionally an aluminum source and tetrapropylammoniumhydroxide as templating agent, having the following composition expressed as molar ratios:
- Al/Si=0–0.04
- TPA-OH/Si=0.2–0.5 wherein TPA=tetrapropylammonium
- H2O/Si=10–35.
Dependencies are inferred from the claim text.