Using impregnation method to produce zirconium tungstate, there are the producing processes as follow:
1.Taking a amount of ZrOCl2 • 8H20 dissolve in an appropriate amount of deionized water, and then drop ammonia to form hydrogel, to adjust the PH value of 9.0.
2.After place hydrogel at room temperature for 12h suction filtered and then using deionized water washed the precipitate until no chlorine ions. The filter cake was then soaked in ethanol and alcoholization in the oven for 12h, after cooling to room temperature then taken out, filtered to remove residual ethanol, dried at 383K, finely ground to obtain a white powdery zirconium hydroxide carrier.
3. The resulting Zr(OH) 4 precursors are impregnated by the following three ways to obtain catalyst:
(1) Preparation a small amount of ammonium metatungstate solution to soak irconium hydroxide powder with stirring to make them thoroughly mixed, dried and calcined at different temperatures to prepare a catalyst, referred to as WZH(A).
(2)The zirconium hydroxide powder was immersed in ammonium metatungstate solution, dried and distilled off the water at different firing temperatures, to prepare a catalyst referred to as WZH(B).
(3) The processes is similar to(2), but change ammonium metatungstate solution to ammonium tungstate solution, to prepare a catalyst referred to as WZH(C).
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