物理化学学报 >> 2010, Vol. 26 >> Issue (06): 1575-1578.doi: 10.3866/PKU.WHXB20100609

催化和表面结构 上一篇    下一篇

Ni含量对Co1-xNixB催化水解放氢性能的影响

李丽, 王一菁, 王亚平, 任秋丽, 焦丽芳, 袁华堂   

  1. 南开大学新能源材料化学研究所, “先进能源材料化学”教育部重点实验室, 天津 300071
  • 收稿日期:2009-12-21 修回日期:2010-02-22 发布日期:2010-05-28
  • 通讯作者: 王一菁 E-mail:wangyj@nankai.edu.cn

Effect of Ni Content in Co1-xNixB Catalysts on Hydrogen Generation during Hydrolysis

LI Li, WANG Yi-Jing, WANG Ya-Ping, REN Qiu-Li, JIAO Li-Fang, YUAN Hua-Tang   

  1. Institute of New Energy Material Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (MOE), Nankai University, Tianjin 300071, P. R. China
  • Received:2009-12-21 Revised:2010-02-22 Published:2010-05-28
  • Contact: WANG Yi-Jing E-mail:wangyj@nankai.edu.cn

摘要:

采用化学还原法以乙醇为溶剂在冰水浴中合成了一系列Co1-xNixB合金催化剂, 研究了该系列合金不同Ni含量对NaBH4水解放氢性能的影响. X射线衍射(XRD), 扫描电镜(SEM)和透射电镜(TEM)显示Co1-xNixB合金是纳米非晶态颗粒. 放氢测试表明Co1-xNixB具有很高的催化活性. 放氢速率先随着Ni含量的增加而增大, 并在x=0.15时放氢速率达到最大值, 然后随x值的增加而减小. 298 K时Co0.85Ni0.15B合金催化碱性硼氢化钠水解的最大放氢速率可达4228 mL·min-1·g-1, CoB和Co0.85Ni0.15B合金催化放氢的活化能分别为34.25和31.87 kJ·mol-1. 因此以乙醇为溶剂合成的Co1-xNixB合金具有较高的催化活性.

关键词: 催化剂, NaBH4, 水解, Co1-xNixB合金, 放氢

Abstract:

A series of Co1-xNixB alloy catalysts were synthesized in ethanol by chemical reduction in an ice-water bath. The catalytic hydrolysis of an alkaline NaBH4 solution was studied by changing the Ni content in the Co1-xNixB catalyst. X-ray diffraction, scanning electron microscopy, and transmission electron microscopy revealed that the as-prepared Co1-xNixB alloys were ultrafine nanoparticles in amorphous form. Hydrogen generation measurements showed that the as-prepared Co1-xNixB alloys exhibited excellent catalytic activity. The hydrogen generation rate firstly increased as the Ni content increased in the Co1-xNixB catalyst, and it reached the highest at x=0.15, then decreased as x increased. The highest hydrogen generation rate at 298 K was 4228 mL·min-1·g-1 for Co0.85Ni0.15B during the catalytic hydrolysis of the alkaline sodium borohydride solution. The activation energies of the Co0.85Ni0.15B alloy and CoB were 31.87 and 34.25 kJ·mol-1, respectively. This showed that the Co1-xNixB alloys synthesized in ethanol had high activity.

Key words: Catalyst, Sodiumborohydride, Hydrolysis, Co1-xNixB alloy, Hydrogen generation

MSC2000: 

  • O643