Co-Precipitation Method Producing Tungsten Trioxide

Co-precipitation method is to add a suitable precipitant in a mixed metal solution, a homogeneous precipitation reaction product. It is an important method for produce ultrafine tungsten oxide which including two or more metal elements. using co-precipitation method producing tungsten trioxide, first step is taking 1mol /L Na2WO4 solution and Na2SnO4 solution slowly drop after mixing to dilute H2SO4 in boiling, stirring constantly generate precipitation. Then after aging, washing, filtering, drying and calcining to obtain SnO2-WO3 gas sensing powder materials. The study found the addition inhibited the growth of SnO2 WO3 grains, increase the sensitivity of its gas, wherein the doping amount of 0.5% is optimum.

Some researchers also use Sol-co-precipitation produce tungsten trioxide, in WCl6 and TiCl (4wt %) aqueous solution adding ammonium hydroxide and suitable surfactants to formW (OH) 6 and Ti (OH) 4, then after centrifuged and calcining to obtain the tungsten trioxide powder in 3 ~ 9nm. The study found that the smaller the particle, the more uniform particle size. Agglomeration, the higher the sensitivity of the respective gas and recovery time is shorter accordingly.

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