The evolution of NiMo unsupported catalysts with 3DOM structure for thiophene hydrodesulfurization
The evolution of NiMo unsupported catalysts with 3DOM structure for thiophene hydrodesulfurization
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DOI：
10.1016/j.cattod.2022.03.010
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发表时间：
2022-10-26
期刊：
影响因子：
5.3
通讯作者：
Wang, Guangjian
中科院分区：
文献类型：
--
作者：
Han, Dezhi;Li, Qinghong;Wang, Guangjian
非负载型加氢脱硫催化剂的微观结构变化会对催化剂的形貌、活性组分的分散性和HDS活性等性能产生显著影响。在95%乙醇溶液中，以聚甲基丙烯酸甲酯（PMMA）胶体晶体为模板，柠檬酸为辅助剂，制备了三维有序大孔（3DOM） NiMo无负载催化剂。采用TG/DTG、XRD、SEM、HRTEM、低温N2吸附-解吸、H2-TPR等技术对制备的无负载催化剂进行了表征。表征结果表明，所有催化剂均具有明确的3DOM结构，不仅能提供丰富的活性位点和较高的比表面积，还能提高活性位点与反应物的接触效率。此外，在所制备的3DOM无负载催化剂中，在360℃、1.0 MPa的反应条件下，3DOM NiMo-1的噻吩转化率达到了99.4%。本研究为设计高效无负载HDS催化剂提供了发展方向。
The microstructure changes of unsupported hydrodesulfurization (HDS) catalysts could significantly influence their properties, including the morphology, the dispersity of active components, and HDS activity. In this work, three-dimensionally ordered macroporous (3DOM) NiMo unsupported catalysts were fabricated using the polymethyl methacrylate (PMMA) colloidal crystal template with the assistance of citric acid in 95% ethanol solution. The TG/DTG, XRD, SEM, HRTEM, low-temperature N2 adsorption-desorption, and H2-TPR techniques were employed to intensively characterize the obtained unsupported catalysts. The characterization results indicated that all catalysts possessed a well-defined 3DOM structure, which could not only provide abundant active sites and high specific surface area but also enhance the contact efficiency between the active sites and reactants. Furthermore, among the prepared 3DOM unsupported catalysts, the 3DOM NiMo-1 exhibited an excellent thiophene conversion rate of 99.4% under the reaction conditions of 360 degrees C and 1.0 MPa. This research provided an evolution direction for designing the high-efficient unsupported HDS catalysts.