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化工学报  2014 

煤“一步法”制天然气催化剂的研究

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Keywords: 煤化工,固定床,催化剂,天然气,反应动力学

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Abstract:

在固定床反应器中,以水蒸气为气化介质,考察了“一步法”煤制天然气K-Fe甲烷化催化剂的催化活性及稳定性,研究了反应动力学方程,并且考察了不同煤种对煤催化甲烷化的影响。在650℃,2MPa下,K15Fe10Ca5对于煤气化及甲烷化均具有良好催化活性。XRD分析表明,活性组分K与Fe之间相互作用,形成的K6Fe2O5促进了煤气化及甲烷化反应。Ca助剂的引入抑制了活性组分与煤中矿物质的结合,同时吸收了煤焦释放出的含硫气体,提高了催化剂的活性。在五次循环实验过程中,CH4产率保持稳定,表明催化剂有较高的稳定性。修正随机孔模型很好地描述了K15Fe10Ca5催化神木煤焦甲烷化的行为,其中界面反应为控制步骤。煤中挥发分,灰分及含硫量等因素都会影响最终的产率。

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