Journal ArticleDOI
Comprehensive study of surface chemistry of MCM-41 using 29Si CP/MAS NMR, FTIR, pyridine-TPD, and TGA
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In this article, a comprehensive study was conducted on mesoporous MCM-41 and it was shown that three types of silanol groups, i.e., single, (SiO)3Si−OH, hydrogen-bonded, and geminal silanols, can be observed.Abstract:
A comprehensive study was conducted on mesoporous MCM-41. Spectroscopic examinations demonstrated that three types of silanol groups, i.e., single, (SiO)3Si−OH, hydrogen-bonded, (SiO)3Si−OH-OH−Si(SiO)3, and geminal, (SiO)2Si(OH)2, can be observed. The number of silanol groups/nm2, αOH, as determined by NMR, varies between 2.5 and 3.0 depending on the template-removal methods. All these silanol groups were found to be the active sites for adsorption of pyridine with desorption energies of 91.4 and 52.2 kJ mol-1, respectively. However, only free silanol groups (involving single and geminal silanols) are highly accessible to the silylating agent, chlorotrimethylsilane. Silylation can modify both the physical and chemical properties of MCM-41.read more
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Ordered mesoporous materials in catalysis
Akira Taguchi,Ferdi Schüth +1 more
TL;DR: In this paper, a review of the preparation of ordered mesoporous catalysts is presented, and the essential properties of the resulting materials are described in the first part of this review.
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Ordered mesoporous materials
TL;DR: A review of the state-of-the-art in the synthesis, characterization and application of ordered mesoporous oxides can be found in this paper, with a focus on the applications in catalysis or other areas.
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Inclusion Chemistry in Periodic Mesoporous Hosts
Karin Moller,Thomas Bein +1 more
TL;DR: An overview of different aspects of inclusion chemistry in ordered mesoporous host materials such as MCM41 or MCM-48 (Mobil codes) can be found in this paper, where a rich field of including chemistry has been explored in this context, including sorption, ion exchange, imbibition followed by reduction, grafting of reactive metal alkoxides, halides etc.
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Amine-Grafted MCM-48 and Silica Xerogel as Superior Sorbents for Acidic Gas Removal from Natural Gas
TL;DR: In this paper, amine-surface modified silica xerogel and MCM-48 materials were synthesized to selectively bind the acidic gases CO2 and H2S.
Journal ArticleDOI
Influences of Material Characteristics on Ibuprofen Drug Loading and Release Profiles from Ordered Micro- and Mesoporous Silica Matrices
TL;DR: In this paper, a series of mesoscopically ordered silicas with different pore sizes, pore connectivity, and pore geometry have been studied as carrier matrices for controlled drug delivery systems.