Method for preparing a low acidity refractory oxide-bound zeolite catalyst

Abstract

A method for preparing a catalyst comprising a zeolite and a low acidity refractory oxide binder which is essentially free of alumina which method comprises:(a) preparing an extrudable mass comprising a substantially homogenous mixture of zeolite, water, a source of the low acidity refractory oxide binder present which comprises an acid sol, and an amine compound,(b) extruding the extrudable mass resulting from step (a),(c) drying the extrudate resulting from step (b); and,(d) calcining the dried extrudate resulting from step (c).

Description

technical field [0001] The present invention relates to a process for preparing a catalyst comprising a zeolite and a low acidity refractory oxide binder substantially free of alumina. Background technique [0002] This approach is described in patent publication US-A-5053374 exemplifying silica-bound USY catalysts. In this preparation method, 65 parts by weight of powdered zeolite was mixed with 35 parts by weight of silica, wherein the silica was composed of amorphous precipitated silica (PPG Industries HiSil 233 EP) and Ludox HS- 30 type basic colloidal silica composition. A homogeneous mixture is obtained by grinding. The moisture content of the mixture was adjusted to 42-47 wt.% with deionized water. The mixture is extruded to produce extrudates. The extrudate is then dried, ammonium exchanged to remove sodium, and calcined. [0003] The contents of binder and zeolite used in the present invention refer to dry contents. The pH values ​​mentioned refer to the value...

AI Technical Summary

Problems solved by technology

Clearly, when the zeolite content is reduced, there is an adverse effect on the strength of the catalyst