Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 83, Issue 1-3, Pages 172-180Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2005.03.020
Keywords
MCM-48; stability; secondary synthesis; hydrothermal treatment; vapour treatment; pore size
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The effect of post-synthesis hydrothermal treatments on MCM-48 has been studied by (29)Si MAS-NMR and IR spectroscopies, X-ray diffraction, thermal gravimetry, and gas volumetry. Special attention has been given to the characterisation of the precursors before calcination and a method to evaluate the pore opening of MCM-48 from diffraction and volumetric data is given. The hydrothermal treatment does not affect the organisation of the cetyltrimethylammonium mesophase but extracts a fraction of the surfactant and increases the thickness of the silica wall. The lower area of the silica-surfactant interface after hydrothermal treatment brings about an improved stability of MCM-48 during calcination and allows the pore size of the precursor to be preserved in the calcined solid. After calcination, the hydrothermally treated samples are less prone to rehydrate and, as a consequence, their stability upon storage in moist atmosphere is dramatically improved. (c) 2005 Elsevier Inc. All rights reserved.
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