Patent ID: 7018595
Filing Date: 2006-03-28
Classification: B01J,C01B,Y10S

Abstract:
1. A process for preparing MFI zeolites having the formula p HMO 2 ·q TiO 2 ·SiO 2 , wherein M is a metal selected from the group consisting of aluminum, gallium and iron, p has a value ranging from 0 to 0.04 and q has a value ranging from 0.0005 to 0.03, 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, a titanium source, optionally a source of a metal M, and tetrapropylammoniumhydroxide as templating agent, having the following composition expressed as molar ratios: Si/Ti=35-2000 M/Si=0-0.04 wherein M is selected from Al, Ga and Fe TPA-OH/Si=0.2-0.5 wherein TPA=tetrapropylammonium H