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- W2000940619 abstract "In order to elucidate the effect of synthesis conditions of Al-MCM-41 on the characteristics of the resultant samples, Al-MCM-41 samples were synthesized through non-hydrothermal reactions under diverse conditions. The following conditions were found to be favorable to prepare Al-MCM-41 with well ordered 2D-hexagonal structure from the reaction mixtures of lower Si/Al ratios: simultaneous addition of Si and Al sources into the solution containing both template of surfactant and anti-foaming agent, in neutral to acidic media (pH 3-7), at temperatures above Krafft point of the surfactant, and under vigorous stirring. These conditions may be associated with assembly of aluminosilicate sources with uniform composition (i.e., constant Si/Al ratio) around the template micelles, promoting hydrolysis and/or condensation of aluminosilicate and forming Al-MCM-41 with highly-ordered structures. Relatively weak acid sites are mainly consisted of Al-MCM-41 and similar distributions of acid strength are observed for the samples with different Si/Al species. Dealkylation reactions of 1, 3, 5-triisopropylbenzene, which are well known to proceed on Bronsted acid sites are catalyzed more effectively on Al-MCM-41 samples than on HY-zeolites. This means that at least, a part of Al was incorporated into the silica framework of MCM-41 structure as tetrahedrally coordinated species in Al-MCM-41 samples prepared in the present study." @default.
- W2000940619 created "2016-06-24" @default.
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- W2000940619 date "2002-01-01" @default.
- W2000940619 modified "2023-10-02" @default.
- W2000940619 title "Several Factors Affecting the Novel Synthesis of Mesoporous Aluminosilicate MCM-41 through Non-hydrothermal Conditions" @default.
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- W2000940619 doi "https://doi.org/10.5188/ijsmer.10.165" @default.
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