Patent ID: 7074383
Filing Date: 2006-07-11
Classification: B01J,C01B,Y10S

Abstract:
1. A process for preparing zeolites of the MFI group having the formula a Al 2 O 3 ·(1-a)SiO 2 , 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 H