There are multiple factors that influence the catalyst performance in the reaction of formic acid dehydrogenation: the nature of catalyst and/or support, the used solvent and reaction variables such as temperature, time, formic acid concentration, presence/absence of formates and pH of the solution. This work evaluates a series of important parameters like the influence of the pH by itself, the influence of the nature of used alkali agents and the effect of direct formate addition as reactive on hydrogen production via formic acid dehydrogenation over a commercially available catalyst. The catalytic performance appears to depend on the ionic radius of the cations of the used base which reflects consequently on the hydrogen selectivity. The best base to be used must have lower hydrated cationic radii and a starting pH around 4 to achieve important hydrogen selectivity for medium term formic acid conversion.

中文翻译：

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通过控制反应 pH 值，从甲酸生产低 CO2 氢气


影响甲酸脱氢反应中催化剂性能的因素有多种：催化剂和/或载体的性质、所用溶剂和反应变量，例如温度、时间、甲酸浓度、甲酸盐的存在/不存在以及pH值。解决方案。这项工作评估了一系列重要参数，例如 pH 值本身的影响、所用碱剂性质的影响以及直接添加甲酸对市售催化剂上甲酸脱氢产生氢气的影响。催化性能似乎取决于所用碱的阳离子的离子半径，从而反映了氢的选择性。所用的最佳碱必须具有较低的水合阳离子半径和 4 左右的起始 pH 值，以实现中期甲酸转化的重要氢选择性。