Effect of coke deposition over microporous and hierarchical ZSM-23 zeolite
| Autor: | Bruno J. B. Silva, Ana C. S. Melo, Paulo H. L. Quintela, Lais R.A. Sarmento, Deidiane S. Silva, Soraya L. Alencar, Antonio O. S. Silva, Lenivaldo V. Sousa |
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| Rok vydání: | 2021 |
| Předmět: |
Thermogravimetric analysis
Materials science 02 engineering and technology Coke Activation energy Microporous material 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 010406 physical chemistry 0104 chemical sciences Catalysis Chemical engineering Desorption Physical and Theoretical Chemistry 0210 nano-technology Zeolite Mesoporous material |
| Zdroj: | Journal of Thermal Analysis and Calorimetry. 147:3161-3170 |
| ISSN: | 1588-2926 1388-6150 |
| DOI: | 10.1007/s10973-021-10740-3 |
| Popis: | The effects of deactivation by coke deposition after the n-heptane cracking reaction were evaluated on crystallinity, acidity and activation energies for the coke thermal oxidation process in microporous and hierarchical ZSM-23 zeolites. The fresh and coked catalysts were characterized by X-ray diffraction, temperature-programmed desorption of ammonia and thermogravimetric analysis. The Flynn–Wall–Ozawa and Vyazovkin kinetic models were used to determine the activation energy of the catalyst regeneration process, using integral dynamic curves from thermogravimetric analysis data obtained with different heating rates. The generation of micro-/mesoporous structures provided a beneficial effect by inhibiting the loss of crystallinity and preserving a certain degree of acidity after catalyst deactivation. The hierarchical ZSM-23 zeolites showed lower deposited coke amounts and activation energy values for the coke thermal oxidation process, providing greater stability, activity and lower energy level required for regeneration in comparison with the microporous zeolites. |
| Databáze: | OpenAIRE |
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