Metal organic framework derived Ni/CeO2 catalyst with highly dispersed ultra-fine Ni nanoparticles: Impregnation synthesis and the application in CO2 methanation
Metal organic framework derived Ni/CeO2 catalyst with highly dispersed ultra-fine Ni nanoparticles: Impregnation synthesis and the application in CO2 methanation
复制标题
具有高度分散的超细镍纳米粒子的金属有机骨架衍生的Ni/CeO2催化剂：浸渍合成及其在CO2甲烷化中的应用
DOI：
10.1016/j.ceramint.2021.01.089
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发表时间：
2021-03-22
影响因子：
5.2
通讯作者：
Gao, Lian
中科院分区：
文献类型：
--
作者：
Feng, Xiaoqian;Wang, Kun;Gao, Lian
CO2甲烷化是将温室气体转化为合成天然气的一种很有前途的策略，合成天然气被称为具有较高能量密度的清洁燃料。Ni/CeO 2是CO2甲烷化反应的活性催化剂之一。然而，传统的金属/载体结构的Ni/CeO 2在高温反应过程中存在颗粒粗化的问题，从而降低了催化活性。本工作采用浸渍法制备了一种新型结构的Ni/CeO 2催化剂。由于MOF衍生的超小孔的限制作用，Ni/CeO 2催化剂具有超细的Ni纳米颗粒，高分散性和良好的热稳定性。在所有的样品中，Ni/CeO 2在600？C表现出最好的催化性能，由于最高量的氧空位。这项工作展示了一种简便的方法来合成各种超细金属/金属氧化物纳米复合催化剂，具有高催化活性和良好的稳定性，用于各种应用。
CO2 methanation is a promising strategy to convert the greenhouse gas into synthetic natural gas, which is known as a clean fuel with higher energy density. Ni/CeO2 is one of the active catalysts for CO2 methanation reaction. However, Ni/CeO2 with conventional metal/support structure suffers from the problem of nanocrystal coarsening during high-temperature reaction and thus decreasing catalytic activity. In this work, a Ni/CeO2 catalyst with novel structure was designed and synthesized through impregnation of Ce-based metal organic framework (MOF) with Ni precursor followed by calcination process. Due to the confinement effect of ultra-small pores derived from the MOF, Ni/CeO2 catalysts with ultrafine Ni nanoparticles, high dispersion and good thermostability were resulted. Among all the samples, Ni/CeO2 calcined at 600 ?C showed the best catalytic performance due to the highest amount of oxygen vacancies. This work demonstrates a facile way to synthesize a broad range of ultra-fine metal/metal oxide nanocomposite catalysts with high catalytic activity and good stability for various applications.