硼氢化钠催化水解放氢性能的研究

发布时间：2018-07-01 18:44

本文选题：硼氢化钠 + 催化剂　；参考：《长安大学》2017年硕士论文

【摘要】：硼氢化钠作为储氢材料,其具有产氢纯度高、容量储存高、无污染、反应条件简单等诸多优点,从而引起了广泛的关注。硼氢化钠水解制氢产生的氢气纯度较高,满足PEMFC系统氢气使用的要求,从而与PEMFC有机地结合。而在近些年的研究中发现,要广泛应用硼氢化钠水解制氢,其首要问题是需要找到更为合适的催化剂,以便高效、廉价地应用于硼氢化钠储氢体系。本文主要研究了CoB分别与La_2O_3、CeO_2、Pr_6O_(11)、Nd_2O_3、Sm_2O_3、Yb_2O_3、Y_2O_3以不同的比例混合,然后在混合催化剂含量分别为2%、3%、4%、5%下的各个体系对硼氢化钠水解放氢的影响。实验首先利用硼氢化钠制备硼化钴;然后采用排水法测得水解反应的放氢量;最后通过分析了在不同体系与不同掺杂比下的催化剂对硼氢化钠水解放氢量、平均放氢速率的影响,研究了硼氢化钠催化水解放氢性能。研究结果表明,稀土氧化物对硼氢化钠水解反应的影响与稀土氧化物的种类、混合催化剂的比例以及掺杂比有着紧密联系。对于不同类型的稀土氧化物,当混合催化剂比例增加时,硼氢化钠水解平均反应速率普遍增加,且为5%反应速率达到最大。通过比较发现,混合催化剂含量3%,掺杂10%La2O3的硼氢化钠水解反应放氢量最大,且为2905.3 ml·g~(-1)。混合催化剂含量5%,掺杂10%Nd2O3的硼氢化钠水解平均反应速率最快,且为3485.4 ml·g~(-1)·min~(-1)。
[Abstract]:As a hydrogen storage material, sodium borohydride has many advantages, such as high hydrogen production purity, high capacity storage, no pollution, simple reaction conditions and so on. The hydrogen produced by hydrolysis of sodium borohydride to produce hydrogen is of high purity, which meets the requirements of hydrogen in PEMFC system and thus combines organically with PEMFC. In recent years, it has been found that in order to widely use sodium borohydride hydrolysis to produce hydrogen, the most important problem is to find a more suitable catalyst for the efficient and cheap application of sodium borohydride hydrogen storage system. In this paper, we mainly study the effect of CoB on the hydrogen liberation of sodium borohydride water at different proportions, respectively, and the CoB and LaShe _ 2O _ 3CeO _ (11) Nd2O3S _ (11) Nd2O6O _ (11) / Nd2OO _ (11) / Nd2O-O _ (11) have been mixed in different proportions. First, cobalt borate was prepared from sodium borohydride; then the amount of hydrogen released from hydrolysis reaction was measured by drainage method; finally, the amount of hydrogen released from sodium borohydride in water was analyzed through the analysis of catalysts in different systems and different doping ratios. The effect of average hydrogen release rate on the catalytic performance of sodium borohydride for water liberation of hydrogen was studied. The results show that the effects of rare earth oxides on the hydrolysis of sodium borohydride are closely related to the type of rare earth oxides, the proportion of mixed catalysts and the doping ratio. For different rare earth oxides, the average rate of hydrolysis of sodium borohydride increases generally when the ratio of mixed catalysts increases, and the reaction rate of 5% reaches the maximum. By comparison, it was found that the amount of hydrogen released from hydrolysis of sodium borohydride doped with 10 La 2O 3 was the largest, and the amount of hydrogen released was 2905.3 ml g ~ (-1). The average hydrolysis rate of sodium borohydride doped with 10Nd2O3 was the fastest, and the reaction rate was 3485.4 ml g ~ (-1) min ~ (-1).
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O643.36;TQ116.2

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