| CoB/CeO2催化剂的优化制备及在NaBH4液相制氢中的应用 |
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| 引用本文： | 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. |
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| 作者姓名： | 刘力魁 刘威 李佳 李芳 李其明 |
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| 作者单位： | 辽宁石油化工大学石油化工学部，辽宁 抚顺 113001 |
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| 基金项目： | 国家自然科学基金;辽宁省教育厅一般项目;辽宁省科技厅计划指导项目 |
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| 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。
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| 关 键 词： | 催化剂 水解 制氢 载体 活性 |
Preparation of CoB/CeO2 catalysts for hydrogen generation from liquid NaBH4 solution |
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| LIU Likui,LIU Wei,LI Jia,LI Fang,LI Qiming.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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| Authors: | LIU Likui LIU Wei LI Jia LI Fang LI Qiming |
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| Affiliation: | School of Petrochemical Engineering, Liaoning Shihua University, Fushun 113001, Liaoning, China |
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| 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. |
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| Keywords: | catalyst hydrolysis hydrogen production support reactivity |
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