Effect of iron on the gasification of Victorian brown coal with steam:enhancement of hydrogen production
Effect of iron on the gasification of Victorian brown coal with steam:enhancement of hydrogen production
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DOI：
10.1016/j.fuel.2005.05.026
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发表时间：
2006
期刊：
影响因子：
7.4
通讯作者：
Jianglong Yu;Fujun Tian;M. Chow;L. McKenzie;Chun-Zhu Li
中科院分区：
文献类型：
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作者：
Jianglong Yu;Fujun Tian;M. Chow;L. McKenzie;Chun-Zhu Li
本文报道了在以铁为催化剂的维多利亚褐煤水蒸气气化过程中，氢气产量的显著提高。用三氯化铁水溶液将铁负载到酸洗后的乐阳褐煤中。在快速颗粒升温条件下，利用石英反应器进行了气化实验。通过在每次实验前后直接称量反应器的重量来确定焦产率。气体分析采用双柱气相色谱。在铁的存在下，半焦的整体气化速率大大增加。利用X射线衍射仪(XRD)和扫描电子显微镜(SEM)研究了热解和气化过程中铁物种的变化。结果表明，高度分散在半焦中的还原铁(α-Fe和γ-Fe)和磁铁矿(Fe3O4)均能催化半焦的水蒸气气化。特别是，在类似条件下，含铁煤样的焦炭比酸洗煤的焦炭产生更高的H_2产率。讨论了铁存在时促进产氢的机理。
This paper reports the significant enhancement of hydrogen production during the gasification of Victorian brown coal with steam using iron as a catalyst. Iron was loaded into the acid-washed Loy Yang brown coal using ferric chloride aqueous solution. Gasification experiments were carried out using a quartz reactor at a fast particle heating rate. The yield of char was determined by directly weighing the reactor before and after each experiment. Gases were analysed using a GC with dual columns. The overall gasification rate of a char increases greatly in the presence of iron. The transformation of iron species during pyrolysis and gasification was examined using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that both reduced-iron (α-Fe and γ-Fe) and magnetite (Fe3O4) highly dispersed in a char can catalyse the gasification of the char with steam. In particular, the char from iron-loaded coal samples gives much higher yields of H2than a char from the acid-washed coal under similar conditions. The mechanism for the enhancement of hydrogen production in the presence of iron is discussed.