Process for preparing microporous crystalline titanium silicate
AssigneeCouncil of Scientific and Industrial Research
InventorsMohan Keraba Dongare, Pratap Tukaram Patil, Kusum Madhukar Malshe
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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.
Claims10
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.
Dependencies are inferred from the claim text.