Microwave-assisted solvothermal synthesis of ZSM-22 zeolite with controllable crystal lengths |
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| Institution: | 1. inGAP Center for Research Based Innovation, Department of Chemistry, University of Oslo, P.O. Box 1033 Blindern, N-0315 Oslo, Norway;2. Haldor Topsøe, Nymøllevej 55, DK-2800 Kgs., Lyngby, Denmark;1. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, PR China;2. National Energy Research Center for Clean Fuels, Synfuels China Co., Ltd, Beijing 101400, PR China;3. University of Chinese Academy of Sciences, Beijing 100049, PR China;1. Chemical Engineering Department and Center of Excellence in Nanotechnology, King Fahd University of Petroleum and Minerals, Dhahran, 31261, Saudi Arabia;2. Division of Chemical Process Engineering, Faculty of Engineering, Hokkaido University, N13-W8, Kita-ku, Sapporo, Hokkaido 060-8628, Japan;1. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, 030001, People’s Republic of China;2. University of Chinese Academy of Sciences, Beijing, 100049, People’s Republic of China;3. School of Chemical and Environmental Engineering, North University of China, Xueyuan Road 3, Taiyuan, 030051, People’s Republic of China;1. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023, China;2. University of Chinese Academy of Sciences, Beijing, 100049, China;3. Energy Innovation Laboratory, BP(China)Dalian Office, Dalian, 116023, China |
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| Abstract: | ZSM-22 (TON) zeolite crystal morphology was successfully controlled using a microwave-assisted solvothermal fabrication method. Different co-solvents, including ethanol, 2-propanol, glycerol, and ethylene glycol, were also applied in the synthesis mixture. The effects of various parameters such as the aging time, the type and amount of co-solvent on the ZSM-22 crystal aspect ratio were investigated. When employing this microwave irradiation synthesis, a long aging time was crucial to obtain smaller and more uniform crystal sizes. The addition of co-solvent resulted in elongated ZSM-22 crystals, regardless of the actual co-solvent used, although ZSM-22 zeolite crystallinity was sensitive to the co-solvent type. In general, the use of a co-solvent stimulated the appearance of ZSM-5 zeolite as an impurity and the amount of this impurity was proportional to the concentration of co-solvent in the synthesis mixture. |
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| Keywords: | Crystal morphology Nucleation Solvent Hydrothermal crystal growth Crystal structure |
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