催化学报 ›› 2014, Vol. 35 ›› Issue (11): 1892-1989.DOI: 10.1016/S1872-2067(14)60177-7

• 论文 • 上一篇    下一篇

Hierarchical ZSM-5 catalyst synthesized by a Triton X-100 assisted hydrothermal method

S. Narayanana,b, J. Judith Vijayaa, S. Sivasankerb, Sihai Yangc, L. John Kennedyd   

  1. a Catalysis & Nanomaterials Research Laboratory, Department of Chemistry, Loyola College (Autonomous), Chennai 600 034, India;
    b National Centre for Catalysis Research, Indian Institute of Technology, Madras, Chennai 600 036, India;
    c School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom;
    d Materials Division, School of Advanced Sciences, Vellore Institute of Technology (VIT) University, Chennai Campus, Chennai 600 127, India
  • 收稿日期:2014-04-11 修回日期:2014-06-17 出版日期:2014-11-06 发布日期:2014-11-06
  • 通讯作者: J. Judith Vijaya

Hierarchical ZSM-5 catalyst synthesized by a Triton X-100 assisted hydrothermal method

S. Narayanana,b, J. Judith Vijayaa, S. Sivasankerb, Sihai Yangc, L. John Kennedyd   

  1. a Catalysis & Nanomaterials Research Laboratory, Department of Chemistry, Loyola College (Autonomous), Chennai 600 034, India;
    b National Centre for Catalysis Research, Indian Institute of Technology, Madras, Chennai 600 036, India;
    c School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom;
    d Materials Division, School of Advanced Sciences, Vellore Institute of Technology (VIT) University, Chennai Campus, Chennai 600 127, India
  • Received:2014-04-11 Revised:2014-06-17 Online:2014-11-06 Published:2014-11-06

摘要:

ZSM-5 zeolite with a hexagonal cubic morphology was synthesized by a hydrothermal method using Triton X-100, a nonionic surfactant. The samples prepared with and without the surfactant were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy, N2 adsorption, high resolution transmission electron microscopy (TEM), high resolution scanning electron microscopy, energy dispersive X-ray analysis, and NH3 temperature-programmed desorption. The XRD patterns confirmed the formation of a pure ZSM-5 crystalline phase without secondary phases. TEM images revealed that the hexagonal cubes were made of peanut-shaped nanoparticles with voids. The catalytic activity of the zeolite samples was evaluated using the selective oxidation of benzyl alcohol with tertiary-butyl hydrogen peroxide as the oxidant at 90 ℃. The surfactant-assisted preparation yielded a zeolite that gave a higher conversion than the one prepared in the absence of the surfactant. The catalyst was retrieved and reused four times without significant loss in activity and selectivity.

关键词: Heterogeneous catalysis, ZSM-5 zeolite, Hydrothermal synthesis, Selective oxidation, Surfactant, Triton X-100

Abstract:

ZSM-5 zeolite with a hexagonal cubic morphology was synthesized by a hydrothermal method using Triton X-100, a nonionic surfactant. The samples prepared with and without the surfactant were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy, N2 adsorption, high resolution transmission electron microscopy (TEM), high resolution scanning electron microscopy, energy dispersive X-ray analysis, and NH3 temperature-programmed desorption. The XRD patterns confirmed the formation of a pure ZSM-5 crystalline phase without secondary phases. TEM images revealed that the hexagonal cubes were made of peanut-shaped nanoparticles with voids. The catalytic activity of the zeolite samples was evaluated using the selective oxidation of benzyl alcohol with tertiary-butyl hydrogen peroxide as the oxidant at 90 ℃. The surfactant-assisted preparation yielded a zeolite that gave a higher conversion than the one prepared in the absence of the surfactant. The catalyst was retrieved and reused four times without significant loss in activity and selectivity.

Key words: Heterogeneous catalysis, ZSM-5 zeolite, Hydrothermal synthesis, Selective oxidation, Surfactant, Triton X-100