Properties of yolk–shell structured Ni@SiO2 nanocatalyst and its catalytic performance in carbon dioxide reforming of methane to syngas
Properties of yolk–shell structured Ni@SiO2 nanocatalyst and its catalytic performance in carbon dioxide reforming of methane to syngas
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DOI：
10.1016/j.cattod.2015.04.012
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发表时间：
2016
期刊：
影响因子：
5.3
通讯作者：
Weiwei Yang;Huimin Liu;Yuming Li;Juan Zhang;Hao Wu;Dehua He
中科院分区：
文献类型：
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作者：
Weiwei Yang;Huimin Liu;Yuming Li;Juan Zhang;Hao Wu;Dehua He
采用盐酸刻蚀法制备Ni@SiO2-核壳型催化剂，采用Stöber法制备核壳型催化剂。相比之下，Ni-SiO2-AE（没有蛋黄-壳结构）用于表示通过与Ni@SiO2-蛋黄-壳类似的方法制备的催化剂，但没有通过SiO2完全包封Ni颗粒。考察了这三种催化剂在甲烷二氧化碳重整制合成气反应中的催化性能。通过改变反应物的GHSV和反应温度在不同条件下进行反应以进一步测试催化剂的稳定性。采用TEM/HRTEM、XRD、TG-DSC等手段对Ni@SiO2-yolk-shell、Ni@SiO2-core-shell和Ni-SiO2-AE催化剂的形貌、结晶度和积炭量等进行了表征。结果表明，Ni@SiO2-yolk-shell和Ni-SiO2-AE催化剂在1073 K以下的反应温度下表现出明显的稳定性，Ni@SiO2-yolk-shell催化剂的特殊结构和抗积炭性能有助于保持反应过程的稳定性。
Ni@SiO2-yolk–shell catalyst was prepared by the method of etching Ni@SiO2-core–shell with hydrochloric acid, while the core–shell catalyst was prepared by the stöber method. In comparison, Ni–SiO2–AE (without yolk–shell structure) was used to denote the catalyst prepared by the similar method as Ni@SiO2-yolk–shell but without fully encapsulation of Ni particles by SiO2. The catalytic performances of these three catalysts were investigated in carbon dioxide reforming of methane to syngas (CRM). The reaction was conducted under different conditions by varying GHSVs of reactants and reaction temperatures to further test the stability of the catalysts. The properties of the as-prepared and spent Ni@SiO2-yolk–shell, Ni@SiO2-core–shell and Ni–SiO2–AE catalysts were characterized by TEM/HRTEM, XRD, TG-DSC to measure the morphology, crystallinity and carbon deposition, etc. It was found that compared to Ni@SiO2-core–shell and Ni–SiO2–AE catalysts, Ni@SiO2-yolk–shell catalyst behaved remarkably stable performance at the temperature up to 1073 K, and the specific structure and carbon deposition-resisted behavior of the Ni@SiO2-yolk–shell catalyst may help to maintain the stability during the reaction.