High temperature stable anatase titanium dioxide
AssigneeE.I.DuPont De Nemours and Company
InventorCarmine Torardi
Life of this patent
Estimating the term…
Abstract
The disclosure relates to a process for making anatase titanium dioxide which is stable at temperatures above 900° C., comprising: (a) mixing an organic water-miscible solvent and a titanate to form a solution comprising titanium; (b) hydrolyzing the solution comprising titanium in the presence of a source of silicon and a source of aluminum to form a hydrolyzed composition of titanium doped with silicon and aluminum; (c) separating the hydrolyzed composition of titanium doped with silicon and aluminum; and (d) calcining the hydrolyzed composition of titanium doped with silicon and aluminum to form high temperature stable anatase titanium dioxide doped with silicon and aluminum and high temperature stable anatase titanium dioxide made by the foregoing process.
Claims25
A process for making anatase titanium dioxide which is stable at temperatures above 900° C., comprising:
- (a) mixing an organic water-miscible solvent and a titanate to form a solution comprising titanium;
- (b) hydrolyzing the solution comprising titanium in the presence of a source of silicon and a source of aluminum to form a hydrolyzed composition of titanium doped with silicon and aluminum;
- (c) separating the hydrolyzed composition of titanium doped with silicon and aluminum;
- and
- (d) calcining the hydrolyzed composition of titanium doped with silicon and aluminum to form high temperature stable anatase titanium dioxide doped with silicon and aluminum.
Titanium dioxide in an anatase crystalline form which is stable at temperatures above 900° C. made by a process, comprising:
- (a) mixing an organic water-miscible solvent and a titanate to form a solution comprising titanium;
- (b) hydrolyzing the solution comprising titanium in the presence of a source of silicon and a source of aluminum to form a hydrolyzed composition of titanium doped with silicon and aluminum;
- (c) separating the hydrolyzed composition of titanium doped with silicon and aluminum;
- and
- (d) calcining the hydrolyzed composition of titanium doped with silicon and aluminum to form high temperature stable anatase titanium dioxide doped with silicon and aluminum.
Dependencies are inferred from the claim text.