Chemical Research in Chinese Universities ›› 2025, Vol. 41 ›› Issue (1): 113-120.doi: 10.1007/s40242-024-4196-0

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Direct Synthesis of UOS Zeolite Using a Simple and Commercially Available Organic Structure-directing Agent

HU Chao1,2, FU Wenhua2, YUAN Zhiqing2, LIU Chuang1,2, WANG Zhendong2, YANG Weimin1,2   

  1. 1. School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, P. R. China;
    2. State Key Laboratory of Green Chemical Engineering and Industrial Catalysis, Sinopec Shanghai Research Institute of Petrochemical Technology Co., Ltd., Sinopec, Shanghai 201208, P. R. China
  • Received:2024-09-23 Online:2025-02-01 Published:2025-01-18
  • Contact: FU Wenhua,fuwh.sshy@sinopec.com;WANG Zhendong,wangzd.sshy@sinopec.com;YANG Weimin,yangwm.sshy@sinopec.com E-mail:fuwh.sshy@sinopec.com;wangzd.sshy@sinopec.com;yangwm.sshy@sinopec.com
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (Nos. 22272201, 21802168), the Shanghai Rising-Star Program, China (No. 23QB1406300) and the Project of China Petrochemical Corporation (Sinopec Group).

Abstract: The preparation of zeolite utilizing commercially available organic compounds instead of complex and expensive ones is of practical significance. Herein, we report the synthesis of germanosilicate zeolite with UOS framework by utilizing a simple and commercially available compound 3-diethylamino-1-propanol (DEAP) as organic structure-directing agent (OSDA) under fluoride condition. The synthesis has been optimized by rational modification of the variables, including the Si/Ge molar ratios, the amount of DEAP and F- anions, the concentration of the synthesis gel and crystallization temperature. UOS zeolite materials were prepared with Si/Ge ratio in the range of 1—4. The physicochemical properties, including crystallinity, crystal morphology, chemical environment of framework elements, textural properties and acidity were characterized by multiple techniques. Ge atoms are proved to preferentially occupy the T sites in the double-four-ring (D4Rs) units. Compared to the isostructural IM-16 zeolite, the UOS zeolites prepared herein are of similar textural properties, such as specific surface area and micropore volume. The simple structure and commercial availability of DEAP endow this synthesis with a cost advantage over the conventional preparation of UOS zeolite, where an expensive imidazolium derivative is employed.

Key words: UOS zeolite, Organic structure-directing agent, Hydrothermal synthesis, Physicochemical property