Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 33, Issue 9, Pages 1535-1543Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2013.01.004
Keywords
Al-MCM-41; Glass-ceramic; Scaffold; Bimodal porosity; Acid catalysis
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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, N-2 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. (C) 2013 Elsevier Ltd. All rights reserved.
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