Methanation over Ni/SiO2: Effect of the catalyst preparation methodologies
Methanation over Ni/SiO2: Effect of the catalyst preparation methodologies
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DOI：
10.1016/j.ijhydene.2012.12.024
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发表时间：
2013-02-19
影响因子：
7.2
通讯作者：
Liu, Chang-jun
中科院分区：
文献类型：
--
作者：
Yan, Xiaoliang;Liu, Yuan;Liu, Chang-jun
本文证实了催化剂制备方法对合成气（CO + H-2）甲烷化Ni/SiO2催化剂的活性和稳定性有显著影响。采用x射线衍射（XRD）、氢程序升温还原（H-2-TPR）和透射电子显微镜（TEM）对催化剂的结构和性能进行了表征。比较了镍前驱体热分解和介质阻挡放电等离子体分解制备的催化剂的活性和稳定性。等离子体分解的结果是高分散性，Ni和SiO2载体之间的相互作用增强，并且Ni颗粒上的缺陷位点减少。还观察到抗Ni烧结性能的增强。此外，等离子体制备的催化剂有效地抑制了非活性碳种的形成。结果表明，等离子体制备的催化剂表现出明显改善的活性和增强的稳定性。版权所有(C) 2012，氢能源出版有限责任公司由爱思唯尔有限公司出版版权所有。
We confirmed here that the catalyst preparation methodologies have a significant effect on the activity and stability of Ni/SiO2 catalyst for methanation of syngas (CO + H-2). Catalyst characterizations using X-ray diffraction (XRD), hydrogen temperature-programmed reduction (H-2-TPR) and transmission electron microscope (TEM) were performed to investigate the structure and performance of the catalysts. The activity and stability of catalysts prepared by thermal decomposition and dielectric-barrier discharge (DBD) plasma decomposition of nickel precursor were compared. The plasma decomposition results in a high dispersion, an enhanced interaction between Ni and the SiO2 support, as well as less defect sites on Ni particles. Enhanced resistance to Ni sintering was also observed. In addition, the plasma prepared catalyst effectively inhibits the formation of inactive carbon species. As a result, the plasma prepared catalyst exhibits significantly improved activity with enhanced stability. Copyright (C) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.