CO2 gasification of Powder River Basin coal catalyzed by a cost-effective and environmentally friendly iron catalyst
CO2 gasification of Powder River Basin coal catalyzed by a cost-effective and environmentally friendly iron catalyst
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DOI：
10.1016/j.apenergy.2015.01.098
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发表时间：
2015-05-01
期刊：
影响因子：
11.2
通讯作者：
Fan, Maohong
中科院分区：
文献类型：
--
作者：
Zhang, Fan;Xu, Deping;Fan, Maohong
在固定床实验室气化炉中，以FeCO3为催化剂前驱体，在常压下对粉河流域（PRB）的亚烟煤进行了CO2气化。采用热重分析（TGA）评价了铁对煤热解的影响。利用扫描电镜（SEM）对炭气化过程中的铁性能进行了表征。通过x射线衍射（XRD）和穆斯堡尔光谱（Mossbauer）对煤气化过程中铁的种类和氧化态进行表征，表明反应气氛和温度之间存在复杂的相互作用，但通常在热解过程中先还原为FeO和金属铁，然后在CO2气化过程中再氧化为Fe3O4。采用收缩核模型和随机孔隙模型进行动力学分析，定量评价了铁的催化效果，收缩核模型效果较好。结果表明，未处理煤的表观活化能为92.7 kJ/mol，铁质量分数为3wt %的煤的表观活化能为58.3 kJ/mol。结果表明，FeCO3对Wyodak煤的CO2气化具有显著的催化作用。(C) 2015 Elsevier Ltd.版权所有。
CO2 gasification of a sub-bituminous Wyodak coal from the Powder River Basin (PRB) was conducted in a fixed-bed laboratory gasifier at atmospheric pressure with FeCO3 as a catalyst precursor. The effect of iron on the coal pyrolysis was evaluated by thermo-gravimetric analysis (TGA). Scanning electron microscopy (SEM) was employed to characterize the iron performance in the char gasification. The iron species and oxidation states during the coal gasification, characterized by X-ray diffraction (XRD) and Mossbauer spectroscopy, indicate a complex interaction between the reaction atmosphere and temperature, but generally proceed through reduction to FeO and metallic iron during pyrolysis, followed by subsequent reoxidation to Fe3O4 during gasification with CO2. The catalytic effect of iron was also quantitatively evaluated by kinetic analysis using shrinking core and random pore models, with the shrinking core model providing superior results. Results show that the apparent activation energy was 92.7 kJ/mol for the untreated coal, which decreased to 58.3 kJ/mol for the coal with 3 wt% Fe. FeCO3 was shown to have a significant catalytic effect on the Wyodak coal gasification with CO2. (C) 2015 Elsevier Ltd. All rights reserved.