CoB/CeO2催化剂的优化制备及在NaBH4液相制氢中的应用

doi:10.16085/j.issn.1000-6613.2019-0968

摘要/Abstract

摘要：

为了提高硼氢化钠水解催化剂的活性与稳定性，本文采用化学还原和焙烧后处理制备了一系列CoB/CeO₂负载型催化剂，探究了该催化剂在NaBH₄液相释氢中的催化性能。通过扫描电镜、X射线衍射、X射线光电子能谱等表征手段分析了催化剂结构和组成，并结合催化剂在NaBH₄水解制氢中的催化活性，研究了不同焙烧后处理方式对CoB/CeO₂负载型催化剂体系的作用规律。结果表明CoB负载到CeO₂载体表面后催化剂仅呈现了CeO₂载体的萤石相结构，但针对活性组分对比分析表明在高温下（空气和氮气）仍然出现了CoB的显著晶化。CoB/CeO₂在空气和氮气焙烧气氛下都有利于提高CoB活性组分在CeO₂载体表面的固载强度，但是二者呈现出不同的微观形貌。在NaBH₄液相释氢中，CoB/CeO₂-air和CoB/CeO₂-N₂展示了显著不同的催化活性，并且随着焙烧温度的提高，二者催化性能差异更加明显，温度升高后CoB/CeO₂-air催化活性逐步降低，并在500℃左右完全失活，而CoB/CeO₂-N₂则呈现了趋于稳定的催化活性。

关键词: 催化剂, 水解, 制氢, 载体, 活性

Abstract:

To improve the catalysts’ activity of NaBH₄ hydrolysis, a series of CoB/CeO₂ supported catalysts were prepared by a combined chemical reduction and post-calcination method. Catalytic activities of these catalysts in the hydrogen generation from NaBH₄ hydrolysis were investigated. Phase structure and composition of the CoB/CeO₂ supported catalysts were characterized by SEM, XRD and XPS, and the results were correlated with their catalytic performance. The experimental results indicated that the as-prepared supported CoB/CeO₂ catalysts exhibited typical fluorite phase structure only, but the comparative analysis showed that significant crystallization of CoB still occurred at high temperature. CoB/CeO₂ catalysts treated under air and nitrogen can have improved immobilization strength, but they displayed different surface morphologies. When used in hydrogen generation from liquid NaBH₄ hydrolysis, CoB/CeO₂-air and CoB/CeO₂-N₂ exhibited obviously different catalytic activities. Moreover, this difference tends to be more obvious at elevated treatment temperature. With the increase of calcination temperature, the catalytic activity of CoB/CeO₂-air gradually decreased and even completely disappeared at 500℃, whereas CoB/CeO₂-N₂ maintained the catalytic activity more stably.

Key words: catalyst, hydrolysis, hydrogen production, support, reactivity

中图分类号:

O643.3

刘力魁, 刘威, 李佳, 李芳, 李其明. CoB/CeO₂催化剂的优化制备及在NaBH₄液相制氢中的应用[J]. 化工进展, 2020, 39(8): 3095-3101.

Likui LIU, Wei LIU, Jia LI, Fang LI, Qiming LI. Preparation of CoB/CeO₂ catalysts for hydrogen generation from liquid NaBH₄ solution[J]. Chemical Industry and Engineering Progress, 2020, 39(8): 3095-3101.

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CoB/CeO₂催化剂的优化制备及在NaBH₄液相制氢中的应用

Preparation of CoB/CeO₂ catalysts for hydrogen generation from liquid NaBH₄ solution

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