费托法
催化作用
钴
奥斯特瓦尔德成熟
材料科学
聚结(物理)
色散(光学)
化学工程
金属
粒径
粒子(生态学)
纳米技术
选择性
化学
有机化学
冶金
工程类
物理
海洋学
天体生物学
地质学
光学
作者
Lei Li,Yan Liu,Junfeng Zhang,Ming Xia,Weijie Ji
出处
期刊:Fuel
[Elsevier]
日期:2022-12-01
卷期号:329: 125481-125481
被引量:1
标识
DOI:10.1016/j.fuel.2022.125481
摘要
The supported catalyst featuring highly dispersed active species is a challenge for industrial catalyst even with high loadings. The traditional impregnation method generally results in large particles due to the particle migration and coalescence or Ostwald ripening process. Herein, a Metal-Organic Frameworks (MOFs) strategy was proposed to assist the manufacture of supported CoOx/SiO2 catalyst. The classic organic ligand (e.g., 2-methylimidazoles) was coordinated with cobalt ions dispersed in advance on silica support, which was post-treated as a sacrificial and protective agent in different atmosphere. These operations can effectively restrain the growth of cobalt particles, yielding the high dispersion of Co metal active sites. The prepared catalyst (CoOx/SiO2-A#) exhibits superior activity, C5+ selectivity and stability in Fischer–Tropsch synthesis. It reveals that the high dispersion as well as the increased number of surface-exposed Co sites contribute to superior activity. As demonstrated by TG-MS and Raman characterizations, a large amounts of carbon species in CoOx/SiO2-N catalyst impeded the accessible active sites. The existence of Co2SiO4 verified by TPR and XPS characterizations means the strong metal-support interaction, that contributes robust performance in long-term stability test. This sacrificial MOFs strategy paves the way for the design of highly dispersed and robust FTS catalysts.
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