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MCM-41 MCM-41 (Mobil Composition of Matter No. 41) is a mesoporous material with a hierarchical structure from a family of silicate and alumosilicate solids that were first developed by researchers at Mobil Oil Corporation and that can be used as catalysts or catalyst supports.〔(Reichinger, M., ''Poröse Silikate mit hierarchischer Porenstruktur: Synthese von mikro-/mesoporösem MCM-41 und MCM-48 Materialien aus zeolithischen Baueinheiten des MFI-Gerüststrukturtyps'' ), Dissertation Ruhr-Universität Bochum, 2007〕 == Structure == MCM-41 consists of a regular arrangement of cylindrical mesopores that form a one-dimensional pore system. It is characterized by an independently adjustable pore diameter, a sharp pore distribution, a large surface and a large pore volume. The pores are larger than with zeolites and the pore distribution can easily be adjusted.〔Silaghi, M.-C., Chizallet, C., Raybaud, P.; ''Challenges on molecular aspects of dealumination and desilication of zeolites'', Microporous and Mesoporous Materials, 191 (2014) 82-96〕 The mesopores have a diameter of 2 nm to 6.5 nm.
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