高等学校化学学报 ›› 2024, Vol. 45 ›› Issue (5): 20240095.doi: 10.7503/cjcu20240095

• 研究论文: 无机化学 • 上一篇    

等级孔结构协同Fe改性提升ZSM-5分子筛催化苯甲醇烷基化性能

宋宇航1, 刘湛1, 吕佳敏1, 余申1, 李小云2, 孙明慧1(), 陈丽华1(), 苏宝连1,3   

  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, 比利时
  • 收稿日期:2024-02-24 出版日期:2024-05-10 发布日期:2024-03-25
  • 通讯作者: 孙明慧,陈丽华 E-mail:sunminghui@whut.edu.cn;chenlihua@whut.edu.cn
  • 基金资助:
    国家重点研发计划项目(2022YFB3504000);国家自然科学基金(22302152);中央高校基本科研业务费专项资金(2024IVA090)

Synergistic Effects of Hierarchically Interconnected Porous Structure and Fe Modification on Zeolite ZSM-5 for Efficient Benzyl Alcohol Alkylation

SONG Yuhang1, LIU Zhan1, LYU Jiamin1, YU Shen1, LI Xiaoyun2, SUN Minghui1(), CHEN Lihua1(), SU Baolian1,3   

  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:2024-02-24 Online:2024-05-10 Published:2024-03-25
  • Contact: SUN Minghui, CHEN Lihua E-mail:sunminghui@whut.edu.cn;chenlihua@whut.edu.cn
  • Supported by:
    the National Key Research and Development Program of China(2022YFB3504000);the National Natural Science Foundation of China(22302152);the Fundamental Research Funds for the Central Universities, China(2024IVA090)

摘要:

针对ZSM-5分子筛微孔扩散限制和催化活性位单一的问题, 使用有序大孔-介孔碳模板为硬模板并结合原位引入金属策略, 一步晶化合成了具有高结晶度、 高比表面积的有序贯通大孔-介孔-微孔等级结构的 Fe/ZSM-5分子筛单晶. 通过X射线衍射(XRD)、 紫外-可见光谱(UV-Vis)、 H2程序升温还原实验(H2-TPR)和X射线光电子能谱(XPS)等手段对催化剂中活性Fe的存在形式进行了表征. 结果表明, 该材料中位于离子交换位及铁氧八面体(六配位)的孤立Fe(III)是主要的氧化还原活性中心, 当Fe负载量(质量分数) 为1%时, 苯甲醇转化率最高为59.3%, 产物选择性为83.2%, 最终收率达到49.3%, 在循环使用5次后仍保持高催化活性.

关键词: ZSM-5分子筛, 等级结构, 过渡金属铁, 芳烃烷基化

Abstract:

Constructing hierarchically porous structures and embedding metal species into zeolite frameworks can effectively enable fast diffusion and synergistic catalysis. We report a one-step synthesis method to synthesize hierarchically macro-meso-microporous zeolite ZSM-5 single crystals containing Fe metal nanoclusters, that has advantages compared to multistep methods such as impregnation and ion exchange. Zeolite ZSM-5-Fe catalysts were prepared by steam assisted crystallization with addition of hierarchically porous carbon template and a Fe precursor. The catalyst was systematically characterized by means of X-ray diffraction(XRD), ultraviolet-visible spectroscopy (UV-Vis), H2-temperature program reduction(H2-TPR), and X-ray photoelectron spectroscopy(XPS). The results indicated that the isolated Fe(III) located at ion exchange sites and ferrite octahedron(six-coordinate) were the main redox-active centers. At a loading amount(mass fraction) of 1%, the highest benzyl alcohol conversion rate reached 59.3%, with a product selectivity of 83.2%, and a final yield of 49.3%. The catalyst maintained high catalytic activity even after five cycles, demonstrating its remarkable stability.

Key words: ZSM-5 zeolite, Hierarchical structure, Transition metal Fe, Aromatic alkylation

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