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化学学报
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化学学报 ›› 2011, Vol. 69 ›› Issue (02): 122-126. 上一篇    下一篇

研究论文

Ni3Al箔在甲烷重整反应中的催化性能

马雁*   

  1. (华北电力大学 核科学与工程学院 北京 102206)
  • 投稿日期:2010-07-23 修回日期:2010-09-06 发布日期:2010-09-19
  • 通讯作者: 马雁 E-mail:mayan@ncepu.edu.cn

Catalytic Property of Ni3Al Foils for Methane Steam Reforming

MA Yan   

  1. (School of Nuclear Science and Engineering, North China Electric Power University, Beijing 102206)
  • Received:2010-07-23 Revised:2010-09-06 Published:2010-09-19

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研究了以冷轧工艺制备的Ni3Al单晶箔(Ni-24at% Al), 以及表面预处理(873 K下蒸汽氧化后还原处理)后的Ni3Al箔, 在甲烷重整制氢反应中的催化性能. 首先, 采用逐步升温法研究了873～1173 K下Ni3Al箔的催化活性与温度的关系; 然后, 采用等温法研究了973 K下Ni3Al箔的催化稳定性. 根据催化反应和扫描电镜显微观察的结果得出: 未经预处理和经过预处理的Ni3Al箔, 在反应中均显示出一定的催化活性和稳定性; 表面预处理对Ni3Al箔的催化活性有显著的增强作用, 原因是经过该预处理后的Ni3Al箔形成了富Ni表面; Ni3Al箔在甲烷重整反应的气氛中, Ni原子从Ni3Al基体向表面的移动, 是维持催化活性的主要原因.

关键词: 甲烷重整, Ni3Al箔, 催化活性, 稳定性

The catalytic activity of Ni3Al foils for methane steam reforming was investigated by isochronal test from 873 to 1173 K, and the stability at 973 K for 20 h was also studied by isothermal test. Further, the effect of pretreatment, which was steam-oxidation then reduction at 873 K on the catalytic property, was also investigated. The results of catalytic reactions and the microstructure observations by SEM showed that the Ni3Al foils whether or not through the pretreatment all had certain activities and stabilities. The pretreatment significantly enhanced the catalytic activity of Ni3Al foils. Ni-enriched outer surface formed after the pretreatment was thought as the main reason of the enhancement. It was also considered that the Ni atoms moved from the matrix of Ni3Al foils to the outer surface during the reactions were attributed to the catalytic stabilities.

Key words: methane steam reforming, Ni3Al foils, catalytic activity, stability