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Hydrogen production by methane cracking over different coal chars

机译：甲烷裂解不同煤焦制氢

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摘要

Hydrogen production by methane cracking over a bed of different coal chars has been studied using a fixed bed reactor system operating at atmospheric pressure and 1123 K. The chars were prepared by pyr-olysing four parent coals of different ranks, namely, Jincheng anthracite, Binxian bituminous coal, Xiao-longtan lignite and Shengli lignite, in nitrogen in the same fixed bed reactor operating at different pyrolysis temperatures and times. Hydrogen was the only gas-phase product detected with a GC during methane cracking. Both methane conversion and hydrogen yield decreased with increasing time on stream and pyrolysis temperature. The lower the coal rank, the greater the catalytic effect of the char. While the Shengli lignite char achieved the highest methane conversion and hydrogen yield in methane cracking amongst all chars prepared at pyrolysis temperature of 1173 K for 30min, a higher catalytic activity was observed for the Xiaolongtan lignite char prepared at 973 K, indicating the importance of the nature of char surfaces. The catalytic activity of the coal chars were reduced by the carbon deposition. The coal chars had legible faces and sharp apertures before being subjected to methane cracking. The surfaces and pores of coal chars were covered with carbon deposits produced by methane cracking as evident in the SEM images. The results of BET surfaces areas of the coal chars revealed that the presence of micropores in the chars was not an exclusive reason for the catalytic effect of the chars in methane cracking.
机译：使用在大气压和1123 K下运行的固定床反应器系统研究了甲烷在不同煤焦床上裂化制氢的问题。这些焦炭是通过热分解金城无烟煤，彬县四种等级的母体煤制得的烟煤，小龙潭褐煤和胜利褐煤在同一固定床反应器中的氮气中，以不同的热解温度和时间运行。氢气是甲烷裂解过程中用气相色谱仪检测到的唯一气相产物。甲烷转化率和氢气产率均随着运行时间和热解温度的增加而降低。煤等级越低，炭的催化作用越大。尽管在1173 K的热解温度下制备的所有焦炭中，胜利力褐煤焦在甲烷裂解中甲烷转化率和产氢率最高，持续30分钟，但在973 K制备的小龙潭褐煤焦中却观察到更高的催化活性，这表明了炭表面的性质。碳沉积降低了煤焦的催化活性。在进行甲烷裂化之前，这些煤焦具有清晰的表面和锐利的孔。扫描电镜图像显示，煤焦的表面和孔隙被甲烷裂解产生的碳沉积物所覆盖。煤焦的BET表面积的结果表明，在煤焦中存在微孔并不是煤焦在甲烷裂化中具有催化作用的唯一原因。

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  • 来源
    《Fuel》 |2011年第11期|p.3473-3479|共7页
  • 作者

    Ling Wei; Yi-sheng Tan; Yi-zhuo Han; Jian-tao Zhao; Jinhu Wu; Dongke Zhang;

  • 作者单位

    Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001 China,Graduate School of Chinese Academy of Sciences, Beijing 100039, China;

    Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001 China;

    Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001 China;

    Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001 China;

    Qingdao Institute of Bioenergy and Bioprocessing Technology, Chinese Academy of Sciences, Qingdao 266101, China;

    Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001 China,Centre for Energy (M473), The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia,Qingdao Institute of Bioenergy and Bioprocessing Technology, Chinese Academy of Sciences, Qingdao 266101, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    bet; coal char; hydrogen; methane cracking; pyrolysis;

    机译：打赌;煤焦氢;甲烷裂解热解;

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