An investigation of the crystallization kinetics of zeotype SAPO-34 crystals synthesized by hydrothermal and sonochemical methods |
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| Institution: | 1. Department of Chemistry, Amirkabir University of Technology, P.O. Box: 15875/4413, Tehran, Iran;2. Catalysis Research Group, Petrochemical Research & Technology Company, National Iranian Petrochemical Company, P.O. Box: 1493, Tehran, Iran;3. Catalysis and Nanotechnology Research Division, Research Institute of Petroleum Industry, P.O. Box: 14665/1998, Tehran, Iran;1. School of Chemistry and Chemical Engineering, Guizhou University, Guiyang, Guizhou, 550025, PR China;2. Key Laboratory of Green Chemical and Clean Energy Technology, Guiyang, Guizhou, 550025, PR China;3. Key Laboratory of Efficient Utilization of Mineral and Green Chemical Technology, Guiyang, Guizhou, 550025, PR China |
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| Abstract: | The kinetics study of SAPO-34 crystallization from a gel containing morpholine as a structure directing agent (SDA) was investigated by means of X-ray diffraction (XRD) patterns in order to determine the kinetics parameters, i.e. induction times, rate constants, frequency factors, and activation energies for the induction and growth stages. The kinetics data of growth period were determined by using the Avrami–Erofeev nucleation growth model. SAPO-34 molecular sieves were synthesized by using both sonochemical-assisted hydrothermal and conventional hydrothermal heating at temperatures of 180, 200, and 220 °C to elucidate the influence of crystallization method on the crystallization kinetics of SAPO-34. The activation energy values indicated that the crystal growth mechanism was enhanced for samples synthesized sonochemically, whereas the induction energy was not greatly affected by using sonication process. Also, the kinetic compensation effect (KCE) was considered in order to obtain the isokinetic temperature. |
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| Keywords: | Zeotype SAPO-34 Crystallization kinetics Avrami–Erofeev model Activation energy Sonochemical crystallization |
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