Preparing Composite Powder Tio2-Wo3-Sio2 Used as Catalyst Carrier

Anatase nanometer TiO₂ is mainly used as activity carrier for denitration catalyst. Because of TiO₂ composites with WO₃ in TiO₂-WO₃-SiO₂ powder, the structure and surface properties have been changed. Also it causes WO₃ distributing more uniform, thus improve the processing performance which is advantageous to mixing, extruding, drying process, thus ensure  rate of finished products. We propose a method for preparing composite powder TiO₂-WO₃-SiO₂, and the specific steps as follows:

1. Beating and dispersing the raw material H₂TiO₃, and then adjust the concentration of titanium dioxide slurry;
2. Add ammonium paratungstate and white carbon black into the slurry;
3. Add ammonia to adjust pH to 5.5~8.5 for improving combination with WO3 and the calcination properties of metatitanic acid;
4. Filtrating and dehydrating the slurry to get massive cake, in which mass fraction of TiO₂is controlled in 40%~55%;
5. Crushing massive cake mechanical, then drying it at 200~380℃ for 2.5 hours, and then calcined 380~680℃ for 4.5 hours;
6. Crushing to generate the required composite powder TiO₂-WO₃-SiO₂.

The method descripts above has the following advantages:
1) Low manufacturing cost, simple process;
2) The products obtained are not only with long service life and high surface area, surface chemical activity, good processing performance, but also have the advantages of high mechanical strength and resistance to erosion.

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