Method for manufacturing a photocatalyst based on titanium dioxide containing carbon or metal
AssigneeKronos International, Inc.
InventorsJoerg Friedrich, Raimund Meifert
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Abstract
A method for manufacturing a photocatalyst, based on titanium dioxide containing carbon or metal, in a pulsation reactor, where a raw material mixture, consisting of nanoparticulate titanium oxyhydrate and an aqueous solution or suspension, containing at least one organic, carbon-containing compound or metal ions, is fed into the pulsating hot-gas stream of the pulsation reactor and the titanium dioxide particles containing carbon or metal are formed. The hot-gas stream has a temperature of ≧450° C. following addition of the material and contains an excess of oxygen. In contrast to the known manufacturing methods, the method according to the invention allows reproducibly good product qualities to be achieved.
Claims26
A method for manufacturing a particulate photocatalyst, based on titanium dioxide containing carbon or metal, in a pulsation reactor, comprising:
- feeding a raw material mixture, containing at least one organic, carbon-containing compound or metal ions, and nanoparticulate titanium oxyhydrate, into a pulsating hot-gas stream of a pulsation reactor,
- forming titanium dioxide particles containing carbon or metal;
- separating the formed titanium dioxide particles from the gas stream;
- wherein the raw material mixture is an aqueous solution or suspension;
- wherein the hot-gas stream contains an excess of oxygen;
- and
- wherein the temperature of the hot-gas stream following addition of the raw material mixture is at least about 450° C.
Dependencies are inferred from the claim text.