CO2 methanation on the catalyst of Ni/MCM-41 promoted with CeO2
CO2 methanation on the catalyst of Ni/MCM-41 promoted with CeO2
复制标题
CeO2 促进 Ni/MCM-41 催化剂上的 CO2 甲烷化
DOI：
10.1016/j.scitotenv.2017.12.308
复制
发表时间：
2018-06-01
影响因子：
9.8
通讯作者：
Wang, Shurong
中科院分区：
文献类型：
--
作者：
Wang, Xiaoliu;Zhu, Lingjun;Wang, Shurong
CO2作为原料与可再生氢结合用于生产有用的化学品和替代能源产品是解决环境和能源问题的方案之一。采用沉积沉淀法制备了Ni含量为20wt%的Ni-xCeO（2）/MCM-41催化剂，并考察了其对CO2甲烷化反应的催化活性。采用BET、XRD、TEM、SEM、H-2-TPR和H-2-TPD等表征手段，探讨了CeO 2对Ni/MCM-41催化剂CO2甲烷化反应的影响机理。结果发现，所有CeO 2促进的催化剂表现出增强的催化活性相比，Ni/MCM-41。在380 ℃常压下，CeO 2改性20%的催化剂表现出最好的催化性能，CO2转化率和CH 4选择性分别为85.6%和99.8%. CeO 2的加入改善了Ni-0活性中心的分散性，增加了CO2的吸附中心，促进剂和载体之间的协同作用被认为是促进催化剂高反应活性的重要因素。稳定性试验表明，改性后的催化剂在30 h后仍保持较高的反应活性。(C)2017爱思唯尔B. V.保留所有权利。
CO2 as a raw feed combined with renewable hydrogen for the production of useful chemicals and alternative energy products is one of the solutions to environmental and energy problems. In this study, a series of Ni-xCeO(2)/MCM-41 catalysts with a nickel content of 20 wt% were prepared through deposition precipitation method for CO2 methanation. Different characterization methods, including BET, XRD, TEM, SEM, H-2-TPR and H-2-TPD were applied to help explore the influence mechanism of CeO2 on Ni/MCM-41 in CO2 methanation. It was found that all CeO2-promoted catalysts exhibited enhanced catalytic activity when compared to Ni/MCM-41. The catalyst modified with 20 wt% CeO2 showed the best catalytic performance, with CO2 conversion and CH4 selectivity of 85.6% and 99.8%, respectively, at the temperature of 380 degrees C under atmospheric pressure. The synergetic effects among Ni-0 active sites, the promoter and the support, including nickel dispersion improvement and increased CO2 adsorption sites due to the addition of CeO2, were considered as important factors for high reactivity of the promoted catalysts. The stability test showed that the promoted catalyst maintained its high reactivity after 30 h. (C) 2017 Elsevier B.V. All rights reserved.