Acta Phys. -Chim. Sin. ›› 2013, Vol. 29 ›› Issue (09): 2035-2040.doi: 10.3866/PKU.WHXB201306183

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

Synthesis and Characterization of Nanosheet ZSM-5 Zeolites with Different SiO2/Al2O3 Molar Ratios

WANG Wu-Gang, ZHANG Shao-Long, ZHANG Lan-Lan, WANG Yan, LIU Xiao-Ling, GONG Yan-Jun, DOU Tao   

  1. State Key Laboratory of Heavy Oil Processing, Key Laboratory of Catalysis, China National Petroleum Corporation, College of Chemistry Engineering, University of Petroleum-Beijing, Beijing 102249, P. R. China
  • Received:2013-04-25 Revised:2013-06-14 Published:2013-08-28
  • Contact: GONG Yan-Jun E-mail:gongyj@cup.edu.cn
  • Supported by:

    The project was supported by the State Key Development Program for Basic Research of China (973) (2012CB215002), National Natural Science Foundation of China (21276278, 21176255), and China National PetroleumCorporation (CNPC) Program, China (2011A-2101).

Abstract:

Nanosheet ZSM-5 zeolites with different SiO2/Al2O3 molar ratios have been hydrothermally synthesized by an organic surfactant with a diquaternary ammoniumgroup. The samples were characterized by X-ray diffraction (XRD), N2 adsorption-desorption, X-ray fluorescence spectroscopy (XRF), scanning electron microscopy (SEM) and 27Al magic angle spinning nuclear magnetic resonance (27Al MAS-NMR) techniques. The synthesis conditions of the nanosheets ZSM-5 were studied, including the synthesis factors such as crystallization temperature and time, the amount of structure-directing agent (SDA) and alkalinity. The results showed that shorter crystallization times were required when synthesis was conducted at higher crystallization temperatures, higher SiO2/Al2O3 ratios, larger amounts of structure-directing agent were used, and higher SiO2/Al2O3 ratios. The morphology, BET and mesopore volume changed with increasing SiO2/Al2O3.

Key words: Nanosheet, ZSM-5 zeolite, Synthetic chemistry, SiO2/Al2O3 ratio

MSC2000: 

  • O641