Chemical Research in Chinese Universities ›› 2025, Vol. 41 ›› Issue (4): 919-928.doi: 10.1007/s40242-025-5038-4

• Articles • Previous Articles     Next Articles

Fabrication of Binder-free Hierarchical ZSM-5 Zeolite Monoliths via Steam-assisted Crystallization

SU Xuemei1,2, WANG Yaquan1,2, BU Lingzhen1,2, ZHANG Xian1,2, LI Yaoning1,2, SANG Juncai1,2, REN Guomei1,2, WEN Muhan1,2   

  1. 1. Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072, P. R. China;
    2. Haihe Laboratory of Sustainable Chemical Transformations, Tianjin 300192, P. R. China
  • Received:2025-03-09 Accepted:2025-04-18 Online:2025-08-01 Published:2025-07-24
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (No. 21276183).

Abstract: Binder-free hierarchical ZSM-5 zeolite monoliths were synthesized via a simple steam-assisted crystallization process. Many characterization techniques, including X-ray diffraction (XRD), X-ray fluorescence (XRF), Fourier transform infrared spectra (FTIR), scanning electron microscopy (SEM), N2 adsorption-desorption, NH3 temperature-programmed desorption (NH3-TPD), pyridine adsorbed Fourier transform infrared spectra (Py-IR) and thermogravimetric analysis (TGA), were utilized to investigate the crystallization process and physicochemical properties and the monolith catalysts were studied for the cracking of n-hexane to olefins (HTO). The results indicated that the ZSM-5 zeolite monoliths featured high crystallinity composed of nano-aggregates with a microporous framework and an auxiliary mesoporous structure. The total pore volume and specific surface area of the ZSM-5 zeolite monoliths increased with the increase of tetrapropylammonium hydroxide content in the preparation. The monolith catalysts exhibited superior catalytic performance in HTO reaction compared to the control sample shaped with binder. Light olefins selectivity of the ZSM-5 zeolite monoliths increased up to 48% in the subsequent stage of the reaction. This work offers a cost-effective, facile, and scalable method for the preparation of catalysts for the petrochemical industry.

Key words: ZSM-5, Binder-free, Monolith, Steam-assisted crystallization, n-Hexane cracking