Titanium-containing porous silica and process of preparing same
AssigneeDirector-General of Agency of Industrial Science and Technology
InventorsKatsunori Kosuge, Puyam Sobhindro Singh
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Abstract
A titanium-containing porous silica having a molecular sieve framework in which more than 3 mole % but not more than 25 mole % of silicon ions are isomorphously substituted by titanium ions. The porous silica may be obtained by gradually adding a liquid containing water and an alkylamine to a mixture containing a silicon alkoxide and a titanium alkoxide with stirring to hydrolyze the silicon alkoxide and the titanium alkoxide and to obtain a gel. The gel is then dried and calcined to obtain the titanium-containing porous silica.
Claims8
A process for the preparation of a titanium-containing porous silica, comprising the steps of:
- providing a mixture containing a silicon alkoxide and a titanium alkoxide and having a molar ratio of said silicon alkoxide to said titanium alkoxide of in the range of 1:0.02 to 1:0.27;
- gradually adding a liquid containing water and an alkylamine to said mixture with stirring in an amount providing a molar ratio of a total of said silicon alkoxide and said titanium alkoxide to said water of 0.5-1.5 to hydrolyze said silicon alkoxide and said titanium alkoxide and to obtain a gel, said liquid having a content of said alkylamine of 1.5-3.0 moles per mole of said water;
- drying said gel;
- and
- calcining said dried gel.
Dependencies are inferred from the claim text.