Pyrolysis kinetics-dependent suitability of Al-based MOFs (CAU-10) for controlling amorphous γ-Al2O3 generation
The thermal degradation of Al-based MOF (CAU-10) were analyzed based on an isoconversional calculation method. The ɤ-Al2O3 formation were characterized using XRD, FTIR, 27Al NMR-MAS and SEM/EDX. The apparent activation energy Ea was evaluated using the iterative isoconversional method. The values of...
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2025-06-01
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| author | Donald Raoul Tchuifon Tchuifon Lucresse Kora Tioma Nguena Giscard Doungmo Sandrale Grace Mokue Mafo Frank Dorinel Solefack Feudjio Cyrille Ghislain Fotsop |
| author_facet | Donald Raoul Tchuifon Tchuifon Lucresse Kora Tioma Nguena Giscard Doungmo Sandrale Grace Mokue Mafo Frank Dorinel Solefack Feudjio Cyrille Ghislain Fotsop |
| author_sort | Donald Raoul Tchuifon Tchuifon |
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| description | The thermal degradation of Al-based MOF (CAU-10) were analyzed based on an isoconversional calculation method. The ɤ-Al2O3 formation were characterized using XRD, FTIR, 27Al NMR-MAS and SEM/EDX. The apparent activation energy Ea was evaluated using the iterative isoconversional method. The values of these energies related to the first step (deshydration) and the second step (framework destruction) for the thermal decomposition of CAU-10 reached 35 and 217 kJ/mol, respectively. This indicates that the second step is a complex kinetic process. In addition, the kinetic processes occur in a single step and can be characterized by a unique kinetic triplet (Ea, A, g(α)). For both decomposition steps of CAU-10, the mechanism includes chemical reactions, nucleation, branched nuclei, and three-dimensional diffusion in the first and second phases. According to the Kissinger-Akahira-Sunose (KAS) and Flynn-Wall-Ozawa (FWO) models in the first step, the Gibbs free energy is between 91.099 kJ/mol and 97.824 kJ/mol; between 242.651 kJ/mol and 244.285 kJ/mol, respectively. This analysis based on thermal measurements combined with structural measurements has highlighted the energetic potential of MOFs synthesis from aluminum exposed to a vapor explosion in a basic context. |
| format | Article |
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| institution | DOAJ |
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| language | English |
| publishDate | 2025-06-01 |
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| series | Chemical Thermodynamics and Thermal Analysis |
| spelling | doaj-art-6fb3b5ab749149ee8d1bf9b098eb93ff2025-08-20T03:10:39ZengElsevierChemical Thermodynamics and Thermal Analysis2667-31262025-06-011810017510.1016/j.ctta.2025.100175Pyrolysis kinetics-dependent suitability of Al-based MOFs (CAU-10) for controlling amorphous γ-Al2O3 generationDonald Raoul Tchuifon Tchuifon0Lucresse Kora Tioma Nguena1Giscard Doungmo2Sandrale Grace Mokue Mafo3Frank Dorinel Solefack Feudjio4Cyrille Ghislain Fotsop5Department of Process Engineering, Laboratory of Chemical Engineering and Industrial Bio-Processes, National Higher Polytechnic School of Douala, University of Douala, PO Box 2701, Douala, Cameroon; Corresponding author.Research Unit of Noxious Chemistry and Environmental Engineering, Department of Chemistry, Faculty of Science, University of Dschang, PO Box 67, Dschang, CameroonInstitute of Inorganic Chemistry, Christian-Albrechts University of Kiel, Kiel, GermanyResearch Unit of Noxious Chemistry and Environmental Engineering, Department of Chemistry, Faculty of Science, University of Dschang, PO Box 67, Dschang, CameroonLaboratory of Applied Physical and Analytical Chemistry, Department of inorganic Chemistry, Faculty of Science, University of Yaoundé 1, PO Box 812, Yaoundé, CameroonResearch Unit of Noxious Chemistry and Environmental Engineering, Department of Chemistry, Faculty of Science, University of Dschang, PO Box 67, Dschang, Cameroon; Faculty of Process and Systems Engineering, Institute of Chemistry, Universität Platz 2, Magdeburg 39106, Germany; Corresponding author at: Research Unit of Noxious Chemistry and Environmental Engineering, Department of Chemistry, Faculty of Science, University of Dschang, PO Box 67, Dschang, Cameroon.The thermal degradation of Al-based MOF (CAU-10) were analyzed based on an isoconversional calculation method. The ɤ-Al2O3 formation were characterized using XRD, FTIR, 27Al NMR-MAS and SEM/EDX. The apparent activation energy Ea was evaluated using the iterative isoconversional method. The values of these energies related to the first step (deshydration) and the second step (framework destruction) for the thermal decomposition of CAU-10 reached 35 and 217 kJ/mol, respectively. This indicates that the second step is a complex kinetic process. In addition, the kinetic processes occur in a single step and can be characterized by a unique kinetic triplet (Ea, A, g(α)). For both decomposition steps of CAU-10, the mechanism includes chemical reactions, nucleation, branched nuclei, and three-dimensional diffusion in the first and second phases. According to the Kissinger-Akahira-Sunose (KAS) and Flynn-Wall-Ozawa (FWO) models in the first step, the Gibbs free energy is between 91.099 kJ/mol and 97.824 kJ/mol; between 242.651 kJ/mol and 244.285 kJ/mol, respectively. This analysis based on thermal measurements combined with structural measurements has highlighted the energetic potential of MOFs synthesis from aluminum exposed to a vapor explosion in a basic context.http://www.sciencedirect.com/science/article/pii/S266731262500015Xɤ-Al2O3MOFCAU-10KineticActivation energyThermodynamics |
| spellingShingle | Donald Raoul Tchuifon Tchuifon Lucresse Kora Tioma Nguena Giscard Doungmo Sandrale Grace Mokue Mafo Frank Dorinel Solefack Feudjio Cyrille Ghislain Fotsop Pyrolysis kinetics-dependent suitability of Al-based MOFs (CAU-10) for controlling amorphous γ-Al2O3 generation Chemical Thermodynamics and Thermal Analysis ɤ-Al2O3 MOF CAU-10 Kinetic Activation energy Thermodynamics |
| title | Pyrolysis kinetics-dependent suitability of Al-based MOFs (CAU-10) for controlling amorphous γ-Al2O3 generation |
| title_full | Pyrolysis kinetics-dependent suitability of Al-based MOFs (CAU-10) for controlling amorphous γ-Al2O3 generation |
| title_fullStr | Pyrolysis kinetics-dependent suitability of Al-based MOFs (CAU-10) for controlling amorphous γ-Al2O3 generation |
| title_full_unstemmed | Pyrolysis kinetics-dependent suitability of Al-based MOFs (CAU-10) for controlling amorphous γ-Al2O3 generation |
| title_short | Pyrolysis kinetics-dependent suitability of Al-based MOFs (CAU-10) for controlling amorphous γ-Al2O3 generation |
| title_sort | pyrolysis kinetics dependent suitability of al based mofs cau 10 for controlling amorphous γ al2o3 generation |
| topic | ɤ-Al2O3 MOF CAU-10 Kinetic Activation energy Thermodynamics |
| url | http://www.sciencedirect.com/science/article/pii/S266731262500015X |
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