Crystallization kinetics of zeolite ZSM-5 |
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| Affiliation: | 1. Department of Physical Chemistry, Technological University of Sofia, Sofia, Bulgaria;2. Institute of Applied Minerology, Bulgarian Academy of Sciences, Sofia, Bulgaria;1. Department of Chemical Engineering, Amirkabir University of Technology, Tehran, Iran;2. Research Institute of Petroleum Industry (RIPI), Tehran, Iran;1. Dipartimento di Scienze della Terra, Università degli Studi di Milano, Via Botticelli 23, 20133, Milano, Italy;2. Dipartimento di Scienze della Terra e dell’Ambiente, Università degli Studi di Pavia, Via Adolfo Ferrata, 7, 27100, Pavia, Italy;3. Department of Environmental and Chemical Engineering, University of Calabria, via Bucci, 87036, Rende, Italy;4. ENEA-Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Trisaia Research Centre, I-75026, Rotondella, Italy;5. ESRF ― European Synchrotron Radiation Facility, 71 Avenue des Martyrs, CS40220, 38043, Grenoble Cedex, France;1. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 116023 Dalian, China;2. National Centre for Magnetic Resonance in Wuhan, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, 430071 Wuhan, China;3. University of Chinese Academy of Sciences, 100049 Beijing, China |
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| Abstract: | Zeolite ZSM-5 was synthesized from aluminosilicate gels in the presence of organic templates — tetrapropylammonium bromide (TPABr) and pyrrolidine (Py) — at temperatures of 423, 438 and 453 K. Nucleation and crystallization processes were subjected to a detailed kinetic analysis. The nucleation region is subdivided into two periods: induction and transition ones. Values of nucleation energy and crystallization energy, preexponential factor, rate of crystallization, and geometric factor have been calculated. Correlations between the estimated kinetic characteristics were found. The activation energy and the preexponential factor for the transitional and crystal-growth periods have the character of a kinetic compensation effect. The mechanism of the crystallization process is discussed on the basis of the kinetic features and correlations. |
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