CO methanation over Ni catalysts supported on high surface area mesoporous nanocrystalline γ-Al2O3 for CO removal in H2-rich stream
CO methanation over Ni catalysts supported on high surface area mesoporous nanocrystalline γ-Al2O3 for CO removal in H2-rich stream
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DOI：
10.1016/j.ijhydene.2014.11.138
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发表时间：
2015-01-30
影响因子：
7.2
通讯作者：
Lay, Ebrahim Nemati
中科院分区：
文献类型：
--
作者：
Alihosseinzadeh, Amir;Nematollahi, Behzad;Lay, Ebrahim Nemati
本文制备了高比表面积的介孔纳米晶γ氧化铝负载镍催化剂，并将其应用于CO甲烷化反应。采用XRD、BET、SEM、TEM、TPD、TPR等技术对制备的样品进行表征。结果表明，优化后的γ - al2o3具有高表面积328 m(2) g（-1）的介孔纳米晶结构。结果表明，25 wt.% Ni/Al2O3催化剂的催化活性最高，在低至240℃的温度下可达到100%的CO转化率。该催化剂在240℃下的120 h内具有较高的CO转化稳定性和CH4选择性。此外，研究了GHSV、CO: h -2比以及CO2和H2O对Ni/Al2O3催化剂在CO甲烷化反应中的催化性能的影响。Copyright (C) 2014, Hydrogen Energy Publications， LLC.由Elsevier Ltd.出版。版权所有。
In this work, nickel catalysts supported on mesoporous nanocrystalline gamma alumina with high surface area were prepared and employed in CO methanation reaction. The prepared samples were characterized by XRD, BET, SEM, TEM, TPD and TPR techniques. The results showed that the optimized gamma-Al2O3 possessed a mesoporous nanocrystalline structure with a high surface area of 328 m(2) g(-1). The catalytic results revealed that 25 wt.% Ni/Al2O3 catalyst exhibited the highest catalytic activity and showed 100% CO conversion at temperatures as low as 240 C. This catalyst exhibited the high stability for CO conversion and CH4 selectivity during 120 h time on stream at 240 degrees C. In addition, the effect of GHSV, CO:H-2 ratio and the effect of CO2 and H2O on the catalytic performance of Ni/Al2O3 catalysts in CO methanation reaction was investigated. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.