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MCM-41
About: MCM-41 is a research topic. Over the lifetime, 2355 publications have been published within this topic receiving 91416 citations.
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TL;DR: In this paper, it was found that mesoporous structures of MCM-41 and MCM48 disintegrate readily in distilled water around 370 K, while the structures can be stable in 100%-steam of 1 atmospheric pressure at much higher temperatures around 820 K. X-ray powder diffraction and magic angle spinning 29Si NMR spectroscopy indicate that the disintegration of the mesopore structures in water occurs due to silicate hydrolysis.
Abstract: It has been found that mesoporous structures of MCM-41 and MCM-48 disintegrate readily in distilled water around 370 K, while the structures can be stable in 100%-steam of 1 atmospheric pressure at much higher temperatures around 820 K. Thus, the structure disintegration is thermodynamically more favorable in water than under the steaming condition. X-ray powder diffraction and magic angle spinning 29Si NMR spectroscopy indicate that the disintegration of the mesoporous structures in water occurs due to silicate hydrolysis.
105 citations
TL;DR: In this paper, the influence of different amine ligands (3-aminopropyl)triethoxysilane versus N-[3]-propyl]ethylenediamine, solvents (water versus ethanol), and mesoporous structures on the size of supported gold nanoparticles were systematically investigated employing nitrogen adsorption-desorption measurement, X-ray diffraction (XRD), diffuse reflectance UV-vis spectroscopy, and transmission electron microscopy.
105 citations
TL;DR: A novel mesoporous aluminosilicate MCM-41, synthesized in a liquid-crystal system, was characterized by magic angle spinning NMR and showed that the calcined material was highly siliceous, while 29Si NMR proved that it was rich in single and geminal silanol groups.
105 citations
TL;DR: In this paper, the addition of tetraalkylammonium or sodium ions to the synthesis gel results in considerable improvement of the hydrothermal stability of mesoporous molecular sieve MCM-41.
105 citations
TL;DR: Two solid catalysts in which a chiral copper(II) bisoxazoline has been covalently anchored on silica and MCM-41 have been prepared; the solids are enantioselective catalysts for the Friedel-Crafts hydroxyalkylation of 1,3-dimethoxybenzene with 3,3, 3-trifluoropyruvate.
105 citations