Al-MCM-41 inside a glass-ceramic scaffold: A meso-macroporous system for acid catalysis

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• 作者：Hao Ma^a ; Francesco Baino^b ; ^c ; Sonia Fiorilli^a ; Chiara Vitale Brovarone^b ; ^c ; Barbara Onida^a ; ^d ; ^{barbara.onida@polito.it}
• 关键词：Al-MCM-41 ; Glass&ndash ; ceramic ; Scaffold ; Bimodal porosity ; Acid catalysis
• 刊名：Journal of the European Ceramic Society
• 出版年：2013
• 出版时间：August, 2013
• 年：2013
• 卷：33
• 期：9
• 页码：1535-1543
• 全文大小：1243 K

文摘

Al-MCM-41 was incorporated, through a sol-gel based dipping approach, inside a glass-ceramic scaffold belonging to the SiO₂-CaO-Na₂O-Al₂O₃ (SCNA) system, to obtain an acidic system with bimodal porosity in the meso- and macro-range. First, SCNA was investigated by means of wide-angle X-ray diffraction (XRD), differential thermal analysis (DTA) and hot stage microscopy (HSM) in order to select the optimal sintering condition to fabricate the macroporous foam-like carrier for Al-MCM-41. Then, Al-MCM-41 was incorporated into the SCNA scaffold; the pH value of Al-MCM-41 synthesis solution, used for the scaffold impregnation process, was shown to be a crucial parameter, on identical scaffold dipping time, to determine the distribution and the stability of the incorporated phase. The systems were characterized by means of XRD, N₂ adsorption/desorption, TGA and SEM coupled with EDS.

The Al-MCM-41-containing scaffold is active in the acid-catalyzed sucrose hydrolysis, chosen as model reaction, at variance with the scaffold as such.