Silica-based synthetic material containing titanium in the crystal lattice and process for its preparation
AssigneeSnamprogetti S.p.A.
InventorsMarco Taramasso, Giovanni Manara, Vittorio Fattore, Bruno Notari
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Abstract
The invention provides a silica-based crystalline material that incorporates titanium into the crystal lattice. A process for preparing this material is also disclosed which is based on the reaction of silica, tetra-alkyl orthotitante and tetrapropyl-ammonium hydroxide.
Claims6
A method for preparing a synthetic, silica-based modified material containing titanium in the crystal latice, said process comprising the steps of reacting, in an aqueous, an alcoholic, or hydroalcoholic solution, a derivative of silicon selected from the group consisting of tetra-alkyl orthosilicates with a tetra-alkyl orthotitanate and tetrapropylammonium hydroxide and crystallizing the mixture in an enclosure for a period of from a few hours to a number of days at a temperature of from 100.degree. C. to 220.degree. C., cooling the mixture and, upon collection on a filter and washing, thereafter drying and firing in air the resultant composition at a temperature comprised between 300.degree. C. and 700.degree. C. for a time of from 2 hours to 24 hours.
A synthetic, silica-based crystalline material consisting essentially of crystalline silica and titanium in the crystalline latice as a replacement element for silicon, said material being represented by the formula:
- 0.0001-1TiO.sub.2.1SiO.sub.2
- said synthetic silica-based crystalline material having been calcined at 300.degree.-700.degree. C. for 2-24 hours.
Dependencies are inferred from the claim text.