化工进展 ›› 2020, Vol. 39 ›› Issue (8): 3095-3101.DOI: 10.16085/j.issn.1000-6613.2019-0968

• 工业催化 • 上一篇    下一篇

CoB/CeO2催化剂的优化制备及在NaBH4液相制氢中的应用

刘力魁(), 刘威, 李佳, 李芳, 李其明()   

  1. 辽宁石油化工大学石油化工学部,辽宁 抚顺 113001
  • 出版日期:2020-08-01 发布日期:2020-08-12
  • 通讯作者: 李其明
  • 作者简介:刘力魁(1993—),男,硕士研究生,研究方向为储氢催化与催化新材料。E-mail:fqliukui@163.com
  • 基金资助:
    国家自然科学基金(21201096);辽宁省科技厅计划指导项目(2019-ZD-0058);辽宁省教育厅一般项目(L2019009)

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

Likui LIU(), Wei LIU, Jia LI, Fang LI, Qiming LI()   

  1. School of Petrochemical Engineering, Liaoning Shihua University, Fushun 113001, Liaoning, China
  • Online:2020-08-01 Published:2020-08-12
  • Contact: Qiming LI

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

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