Article ID Journal Published Year Pages File Type
75592 Microporous and Mesoporous Materials 2010 6 Pages PDF
Abstract

In this paper, we investigated on the preparation of three zeolite encapsulated-trityl cations (trityl, dimethoxytrityl and methoxytrityl) using supercritical CO2 (scCO2) as the processing media. Since the studied trityl cations had a size larger than the diameter of the zeolite channels, the fabrication was based on a ship-in-a-bottle procedure using benzene, benzaldehyde, anisole, diphenylcarbinol and benzophenone as building blocks. The different cations were prepared by nucleophilic substitution, using the inner supercage of the acid zeolite as both a microreactor and a negative counterion for the trityl cation. The obtained impregnated samples were purified by cleaning with a continuous flow of scCO2. Loaded amounts of ca. 8 wt.% were obtained following the supercritical procedure. The successful formation of the cation was confirmed by using optical spectroscopies, such as UV–vis diffuse reflectance and FTIR spectroscopies.

Related Topics
Physical Sciences and Engineering Chemical Engineering Catalysis
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