高等学校化学学报 ›› 2023, Vol. 44 ›› Issue (10): 20230109.doi: 10.7503/cjcu20230109

• 物理化学 • 上一篇    下一篇

Cu基等级孔ZSM-5分子筛单晶的制备及硝基苯加氢催化性能

谢小兰1, 刘湛1, 吕佳敏1, 余申1, 李小云2(), 苏宝连1,3, 陈丽华1()   

  1. 1.武汉理工大学材料复合新技术国家重点实验室,
    2.硅酸盐建筑材料国家重点实验室, 武汉 430070
    3.那慕尔大学无机材料化学实验室, 那慕尔 B?5000
  • 收稿日期:2023-03-14 出版日期:2023-10-10 发布日期:2023-04-25
  • 通讯作者: 李小云 E-mail:xiaoyunli2015@whut.edu.cn;chenlihua@whut.edu.cn
  • 作者简介:陈丽华, 男, 博士, 研究员, 主要从事能源环境催化材料方面的研究. E-mail: chenlihua@whut.edu.cn
  • 基金资助:
    国家自然科学基金(U20A20122)

Preparation of Cu-based Hierarchical Pore ZSM-5 Zeolite Single Crystals and Their Catalytic Properties for Nitrobenzene Hydrogenation

XIE Xiaolan1, LIU Zhan1, LYU Jiamin1, YU Shen1, LI Xiaoyun2(), SU Baolian1,3, CHEN Lihua1()   

  1. 1.State Key Laboratory of Advanced Technology for Materials Synthesis and Processing
    2.State Key Laboratory of Silicate Material for Architecture,Wuhan University of Technology,Wuhan 430070,China
    3.Laboratory of Inorganic Materials Chemistry,University of Namur,Namur B?5000,Belgium
  • Received:2023-03-14 Online:2023-10-10 Published:2023-04-25
  • Contact: LI Xiaoyun E-mail:xiaoyunli2015@whut.edu.cn;chenlihua@whut.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(U20A20122)

摘要:

为了解决晶内等级孔创制过程中分子筛骨架不可逆损坏的问题, 本文利用具有反蛋白石结构的有序大孔-介孔碳作为硬模版, 自下而上原位合成了具有规则贯通大孔-介孔-微孔等级多孔结构的硅铝分子筛ZSM-5单晶材料(OMMS-ZSM-5), 其具有较高的外比表面积(195.8 m2/g)和孔体积(0.27 cm3/g). 以该OMMS-ZSM-5为载体, 采用浸渍法制备了不同Cu负载量(质量分数分别为1%, 5%, 10%)的系列Cu-OMMS-ZSM-5催化剂, 探究了不同金属载量催化剂在硝基苯液相加氢反应中的催化能力. 对所制备催化剂的理化性质进行了表征, 发现Cu元素以CuO的形式高度分散, 当负载量为9.58%时, 硝基苯转化率最高达到96.8%, 苯胺选择性达到99.3%. 与Cu基微米ZSM-5分子筛催化材料相比, Cu-OMMS-ZSM-5的苯胺选择性提高了32.4%, 硝基苯转化率提高了26.1%, 并在循环3次后仍然保持很高的催化活性.

关键词: 等级孔分子筛, Cu-ZSM-5, 硝基苯加氢, 苯胺

Abstract:

In order to solve the problem of irreversible damage of zeolite framework in the process of intracrystalline hierarchically porous creation, a single crystal of silica-alumina zeolite ZSM-5(OMMS-ZSM-5) with hierarchically ordered macro-meso-microporous structure was successfully bottom-up in situ synthesized by using ordered macro- mesomicroporous carbon with anti-opal structure as a hard template, which possesses high external specific surface area(195.8 m2/g) and pore volume(0.27 cm3/g). In addition, a series of Cu-OMMS-ZSM-5 catalysts with different Cu loadings(mass fraction: 1%, 5%, 10%) was prepared by impregnation method using OMMS-ZSM-5 as a carrier to investigate the catalytic ability of different metal loading catalysts in the liquid-phase hydrogenation reaction of nitrobenzene. The physical and chemical properties of the prepared catalysts were comprehensively characterized by SEM, TEM, XRD, NMR, N2 adsorption-desorption, NH3-TPD, XPS and H2-TPR tests, which shows that the Cu elements are highly dispersed in the form of CuO, and the conversion of nitrobenzene reaches up to 96.8% and the selectivity of aniline reaches 99.3% when the loading is 9.58%(mass fraction). Compared with the Cu-based micron ZSM-5 zeolite catalytic material, the aniline selectivity and the nitrobenzene conversion of Cu-OMMS-ZSM-5 are improved by 32.4% and 26.1%, respectively, and the high catalytic activity is maintained after three cycles.

Key words: Hierarchically porous zeolite, Cu-ZSM-5, Nitrobenzene hydrogenation, Aniline

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