Temperature Effect Preparation Of Pyrochlore Type Tungsten Oxide Powder

Formulated a number of copies 0.3mol/L. Than the concentration of sodium tungstate solution of 100ml, and then divided into two groups do different treatment: one group solution R1 (OOH) n as an additive, the amount of each solution were added 2g, will stir mixed clarification Move solution autoclave, hydrothermal reaction at different temperatures within 24h 4h reaction time was analyzed for every solution. Another group of solutions chosen Ra (OH) n as an additive, in accordance with different doses of sodium tungstate was added to the solution, after the mixed solution was stirred into a uniform clear autoclave, subjected to hydrothermal reaction at different temperatures, only 24h after the solution was analyzed.

To R1(OOH)n is additive, the increase in the range of 110-140 ℃ temperature significantly help to improve response rates, reduce the temperature continues to increase the reaction rate Shique cause. From the microscopic point of view, the elevated temperature to increase the percentage of activated molecules, thereby increasing the chemical reaction rate. And because Rl (OOH) n prone to dehydration reaction itself at 160 ℃, thereby reducing the concentration of the solution in the expansion, causing excessively high temperatures but not conducive to promote the reaction.

With Ra (OH) n is additive, the effect of temperature on the decomposition rate after 24h, and added the effects of Ra (OH) n addition amount of the reaction rate. Visible increase Ra (OH) n addition amount of help to improve the reaction rate, which is consistent with the added Rl (OOH) n when the result. On the effect of temperature, the high temperature also increases the reaction rate and is not conducive to the final solution of the decomposition rate, since the Ra (OH). At about 180 ℃ into liquid, resulting in a significant increase in viscosity hydrothermal reaction is carried out to the detriment of, and at a high temperature prone to more complex self-decomposition reaction, reducing the concentration of weak acid product decreases the reaction rate.

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