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Study and characterization of Al-MCM-41 prepared with the assistance of supercritical CO2 / Li Shimin in Industrial & engineering chemistry research, Vol. 47 n°21 (Novembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°21 (Novembre 2008) . - p 8211–8217 Titre : Study and characterization of Al-MCM-41 prepared with the assistance of supercritical CO2 Type de document : texte imprimé Auteurs : Li Shimin, Auteur ; Qun Xu, Auteur ; Chen, Alain, Auteur Année de publication : 2008 Article en page(s) : p 8211–8217 Note générale : Chemical engineering Langues : Anglais (eng) Résumé : Supercritical carbon dioxide (SC CO2) was used as a carrier/solvent for the “dry” alumination of mesoporous silica to prepare aluminum-containing mesoporous MCM-41. The effect of alumination on the structure and crystallinity of the materials was studied. In addition, the hydrothermal and thermal stability of this material have been investigated and compared with Al-MCM-41 prepared via conventional impregnation and direct hydrothermal synthesis. Irrespective of the preparation method, the surface area, pore diameter, pore volume, and crystallinity of Al-MCM-41 all decrease after hydrothermal and thermal treatments. However, Al-MCM-41 materials prepared with the assistance of SC CO2 possess better hydrothermal and thermal stability. This method allows for the incorporation of aluminum onto rather than into pores wall, without disintegration of the mesoporous structure, compared to Al-MCM-41 that has been prepared via impregnation and direct hydrothermal synthesis. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800046h [article] Study and characterization of Al-MCM-41 prepared with the assistance of supercritical CO2 [texte imprimé] / Li Shimin, Auteur ; Qun Xu, Auteur ; Chen, Alain, Auteur . - 2008 . - p 8211–8217. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°21 (Novembre 2008) . - p 8211–8217 Résumé : Supercritical carbon dioxide (SC CO2) was used as a carrier/solvent for the “dry” alumination of mesoporous silica to prepare aluminum-containing mesoporous MCM-41. The effect of alumination on the structure and crystallinity of the materials was studied. In addition, the hydrothermal and thermal stability of this material have been investigated and compared with Al-MCM-41 prepared via conventional impregnation and direct hydrothermal synthesis. Irrespective of the preparation method, the surface area, pore diameter, pore volume, and crystallinity of Al-MCM-41 all decrease after hydrothermal and thermal treatments. However, Al-MCM-41 materials prepared with the assistance of SC CO2 possess better hydrothermal and thermal stability. This method allows for the incorporation of aluminum onto rather than into pores wall, without disintegration of the mesoporous structure, compared to Al-MCM-41 that has been prepared via impregnation and direct hydrothermal synthesis. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800046h