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本工作研究了在有石墨和碳化钨粉末催化剂存在的情况下,用氢加压还原醋酸盐缓冲溶液中的水合镍(Ⅱ)时,温度、原液的初始pH值、氢分压以及混合速率对还原过程的影响。镍的还原与镍浓度的关系遵循一级反应动力学。还原速度与氢分压的平方根成正比,而混合速率在400—700min~(-1)的范围内,还原速度与混合速率无关,用石墨粉末催化剂或用碳化钨粉末催化剂时,反应过程的表观活化能(△Ea)分别为77.6kJ/mol和80.1kJ/mol。当采用石墨粉末催化剂时,观察到了反应过程有一个非常长的诱导期。
This work investigated the effect of hydrogen pressure on the hydration of nickel (II) hydrate in acetate buffer solution in the presence of graphite and tungsten carbide powder catalysts. The temperature, the initial pH of the stock solution, the hydrogen partial pressure, and the mixing rate The impact of the restoration process. The relationship between nickel reduction and nickel concentration follows first-order reaction kinetics. The reduction rate is proportional to the square root of the partial pressure of hydrogen, and the mixing rate is in the range of 400-700 min -1. The reduction rate is independent of the mixing rate. When using a graphite powder catalyst or a tungsten carbide powder catalyst, The observed activation energies (ΔEa) were 77.6 kJ / mol and 80.1 kJ / mol, respectively. When using a graphite powder catalyst, a very long induction period was observed for the reaction.