Chinese Journal of Catalysis ›› 2019, Vol. 40 ›› Issue (1): 52-59.DOI: 10.1016/S1872-2067(18)63167-5

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Eco-friendly synthesis of high silica zeolite Y with choline as green and innocent structure-directing agent

Dawei Hea,b, Danhua Yuana, Zhijia Songa,b, Yunpeng Xua, Zhongmin Liua   

  1. a National Engineering Laboratory for Methanol to Olefins, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
    b University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2018-09-12 Revised:2018-09-23 Online:2019-01-18 Published:2018-11-09
  • Contact: 10.1016/S1872-2067(18)63167-5
  • Supported by:

    The work was supported by the National Natural Science Foundation of China (Grant No.21802136).

Abstract:

Zeolite synthesis in contemporary chemical industries is predominantly conducted using organic structure-directing agents (OSDAs), which are chronically hazardous to humans and the environment. It is a growing trend to develop an eco-friendly and nuisanceless OSDA for zeolite synthesis. Herein, choline is employed as a non-toxic and green OSDA to synthesize high silica Y zeolite with SiO2/Al2O3 ratios of 6.5-6.8. The prepared Y zeolite samples exhibited outstanding (hydro)thermal stability at ultrahigh temperature owing to the higher SiO2/Al2O3 ratio. The XRF, SEM, 29Si-NMR and 13Na+ results suggested that choline plays a structure-directing role in the synthesis of Y zeolite, while the feed molar fraction of Na+ is a crucial determinant for the framework SiO2/Al2O3 ratio and the crystal morphology.

Key words: Zeolite synthesis, FAU zeolite, High silica, Green organic structure-directing agent, (Hydro)thermal stability