化工进展 ›› 2023, Vol. 42 ›› Issue (11): 5730-5737.DOI: 10.16085/j.issn.1000-6613.2022-2286

• 工业催化 • 上一篇    下一篇

Mo2C的原位合成及增强Co基催化剂氨硼烷水解产氢性能

段继转(), 刘宪云()   

  1. 河南理工大学化学化工学院,河南 焦作 454000
  • 收稿日期:2022-12-09 修回日期:2023-03-23 出版日期:2023-11-20 发布日期:2023-12-15
  • 通讯作者: 刘宪云
  • 作者简介:段继转(1999—),女,硕士研究生,研究方向为纳米催化材料的制备及催化产氢。E-mail:duan_jizhuan@163.com
  • 基金资助:
    河南理工大学博士基金(B2019-45)

In-situ synthesis of Mo2C and enhancement of Co based catalyst for hydrogen production from ammonia borane hydrolysis

DUAN Jizhuan(), LIU Xianyun()   

  1. School of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan, China
  • Received:2022-12-09 Revised:2023-03-23 Online:2023-11-20 Published:2023-12-15
  • Contact: LIU Xianyun

摘要:

为了研究Mo2C与Co之间的协同作用对催化氨硼烷水解制氢的影响,采用分步浸渍法制备了Co-30Mo2C/CNTs复合纳米材料。采用X射线衍射、扫描电子显微镜和X射线光电子能谱对催化剂进行表征,并考察了其催化氨硼烷水解制氢性能。结果表明,实验方法成功合成Co-30Mo2C/CNTs,Co和Mo2C可以较均匀分散在CNTs周围,且Mo2C可以局部生长成棒状结构,对团聚成块状的CNTs起支撑作用,使催化剂可以具有更多空隙,暴露更多活性位点。对Co-30Mo2C/CNTs、30Mo2C/CNTs和10Co/CNTs中的Co、Mo元素结合能进行分析,发现存在部分电子转移,影响并改善了Co-30Mo2C/CNTs的催化活性。Co-30Mo2C/CNTs催化氨硼烷水解产氢速率最高,可达11866,这优异的催化活性归结于Co和Mo2C之间的协同作用,Mo2C的添加增强了对H2O分子的活化。经过五圈稳定性测试后,活性依然可以保留75%,这对非贵金属催化剂的可回收投入使用具有一定的研究意义。

关键词: 氨硼烷, 制氢, 催化剂, 催化作用, 钴, 碳化钼, 催化剂载体

Abstract:

In order to study the synergistic effect between Mo2C and Co on the catalytic hydrolysis of ammonia borane to hydrogen, Co-30Mo2C/CNTs nanomaterial was prepared by a step impregnation method. The synthesized catalysts were characterized by X-ray diffraction, scanning electron microscopy and X-ray photoelectron spectroscopy, and their catalytic performance of ammonia borane hydrolysis was tested. The results showed that Co-30Mo2C/CNTs was successfully synthesized, Co and Mo2C were evenly dispersed around CNTs. Mo2C grew into rod-shaped structures locally, which could play a supporting role for the agglomerated CNTs, and hence the catalyst possessed more voids and exposed more active sites. The binding energies of Co and Mo in Co-30Mo2C/CNTs, 30Mo2C/CNTs and 10Co/CNTs were analyzed. It was found that there was partial electron transfer, which improved the catalytic activity of Co-30Mo2C/CNTs. The hydrogen production rate of Co-30Mo2C/CNTs was the highest, reaching 11866. This excellent catalytic activity can be attributed to the synergistic effect between Co and Mo2C. The addition of Mo2C enhanced the activation of H2O molecules. After five cycles of stability test, 75% of the activity were retained, which is of significance for the recyclability of non-precious metal catalysts.

Key words: ammonia borane, hydrogen production, catalyst, catalysis, Co, Mo2C, catalyst support

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