Patent ID: 6991678
Filing Date: 2006-01-31
Classification: C01B

Abstract:
1. A process for preparation of microporous, crystalline titanium silicate having a silicalite-1 structure and a chemical composition of formula xTiO 2 :(1−x) SiO 2 wherein x is in the range of 0.001 to 0.05, which comprises: a) adding a solution of titanium peroxide as a titanium source to ethyl silicate with or without an organic solvent to obtain a homogenous gel, b) hydrolyzing the homogeneous gel obtained in step (a) by adding an organic base to the above said resultant gel with silica to organic base ratio in the range of 1:0.06 to 0.15 followed by adding deionised water when yellow white gel turns into greenish white gel, c) stirring the above greenish white gel for about 1 hr, d) heating the stirred greenish white gel at autogenous pressure, at a temperature in the range of 100 to 110° C. for a period of 1–4 days to obtain a solid composite material, separating the resultant solid composite material, drying and calcining the resultant solid composite material at a temperature in the range of 350–550° C. in the presence of air to obtain the desired product.