Process for preparing microporous crystalline titanium silicate
First Claim
1. A process for preparation of microporous, crystalline titanium silicate having a silicalite-1 structure and a chemical composition of formula xTiO2:
- (1−
x) SiO2 wherein x is in the range of 0.001 to 0.05, which comprises;
a) adding 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.
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Abstract
A process for the preparation of crystalline microporous titanium silicates using ethylsilicate-40 and titanium peroxide as silicon and titanium sources respectively is described. The process permits a significant decrease in the production cost of titanium silicate containing higher amount of titanium (Si/Ti=20) because of cheaper raw materials as well as reduction in the quantity of tetarpropylammonium hydroxide (TPAOH) template (SiO2:TPAOH=1:0.06-0.1) required for preparation. The material obtained by the present invention is useful as an active catalyst in the reactions such as oxidation of hydrocarbons, alcohols, sulphides, and thioethers.
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10 Claims
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1. A process for preparation of microporous, crystalline titanium silicate having a silicalite-1 structure and a chemical composition of formula xTiO2:
- (1−
x) SiO2 wherein x is in the range of 0.001 to 0.05, which comprises;
a) adding 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- (1−
Specification