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• W2085673985 abstract "In this work, we are reporting for the first time the synthesis of hierarchical micro- and mesoporous zeolite using silica–carbon (SiO2/C) composites prepared by pyrolysis of carbonaceous gases in the presence of silica gel. The pyrolysis effectively yielded carbon deposited onto the raw silica material. The obtained SiO2/C composites were utilised as a bifunctional material, mesoporous template and silica source, for the zeolite synthesis. Tetrapropylammonium hydroxide (TPAOH) was used as a microporous template. The combination of the obtained composites and the TPAOH for the hydrothermal synthesis resulted in the formation of hierarchical micro- and mesoporous ZSM-5. The results from the SEM, TEM, and N2 adsorption/desorption isotherms, and 27Al MAS NMR characterisations of the synthesised samples obtained after the removal of the templates confirmed the successful formation of the micro- and mesoporous zeolites. The mesoporosity of the zeolites could be controlled by adjusting the carbon content in the SiO2/C composites while the carbon content could be controlled by varying the deposition time and the concentration of the carbonaceous gases used. This controllable and efficient synthesis method is considered to be a promising method for creating hierarchical micro- and mesoporous zeolites. © 2011 Canadian Society for Chemical Engineering Dans ce travail nous présentons pour la première fois la synthèse de zéolites micro- et mesoporeux hiérarchisés en utilisant des composites de silice-carbone (SiO2/C), prépares par pyrolyse de gaz en présence de gels de silice. La pyrolyse conduit a du carbone déposé sur la silice de départ. Les composites obtenus ont été utilisés comme matériaux bifontionnels, template mesoporeux et source de silice, pour la synthèse de zéolites. L'hydroxyde de tetrapropylammonium (TPAOH) a été utilisé comme template microporeux. La combinaison des composites obtenus avec le TPAOH pour la synthèse hydrothermale a conduit à la formation de ZSM-5 micro- et mesoporeux hiérarchisé. Après élimination du template, les résultats des mesures SEM, TEM et des isothermes d'adsorption/désorption de N2 ainsi que les caractérisations 27Al MAS NMR des échantillons synthétisés ont confirmé la formation des zéolites micro- et mesoporeux. La mesoporosité des zéolites a été contrôlé en variant le temps de dépôt et la concentration des gaz. Cette synthèse contrôlable et efficace peut être considérée comme une méthode prometteuse pour la génération de zéolites micro- et mesoporeux hiérarchisés. Copyright © 2011 Canadian Society for Chemical Engineering Additional Supporting Information may be found in the online version of this article. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article." @default.
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• W2085673985 date "2011-12-05" @default.
• W2085673985 modified "2023-10-14" @default.
• W2085673985 title "The versatile synthesis method for hierarchical micro- and mesoporous zeolite: An embedded nanocarbon cluster approach" @default.
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• W2085673985 doi "https://doi.org/10.1002/cjce.20692" @default.
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