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PublicationMicroporous and Mesoporous Materials
Year2014
Volume186
Pages146–154
International

Solvothermal synthesis of disordered mesoporous materials based on a Si–N framework in ionic liquids

Authors:A.I. Saugar, Álvaro Mayoral , J. Perez-Pariente
Groups of research:Molecular Sieves

Silicon–nitrogen network based porous materials have been synthesized by a novel method based on the preparation of silicon diimide gel by the ammonolysis of silicon tetrachloride using an ionic liquid as solvent followed by a heating process. The resulting materials contain ionic liquid molecules occluded inside the framework, which can be remove by heat treatment at 600 °C under flowing ammonia leading to microporous and mesoporous materials with high surface areas. The pore size of the materials is tailored by the variation of the experimental conditions.

STEM investigations reveal a disordered porous structure with pores with an average diameter of 10 nm in the mesoporous samples. A N/Si molar ratio higher than 2 is obtained for all the ammonia-calcined materials and FTIR and XPS measurements indicate a high number of Si–NH groups, both in the bulk and on the materials surface.

Keywords:Silicon diimide, Ionic liquids, Porous materials, STEM, XPS
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