Highly microporous monodisperse silica spheres synthesized by the Stöber process

Bazula, Piotr; Arnal, Pablo; Galeano Nunez, Diana Carolina; Zibrowius, Bodo; Schmidt, W.; Schüth, Ferdi

doi:10.1016/j.micromeso.2014.07.051

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Highly microporous monodisperse silica spheres synthesized by the Stöber process

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Bazula, Piotr
BASF Construction Solutions GmbH, D-83308 Trostberg, Germany.;
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Arnal, Pablo
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;
Centro de Tecnología de Recursos Minerales y Cerámica, Camino Centenario y 506, CC 49 (B1897ZCA), M.B. Gonnet, La Plata, Argentina.;

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Galeano Nunez, Diana Carolina
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;
BASF SE, Carl-Bosch-Straße 38, D-67056 Ludwigshafen, Germany.;

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Zibrowius, Bodo
Service Department Farès (NMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Schmidt, W.
Research Group Schmidt, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Schüth, Ferdi
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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引用

Bazula, P., Arnal, P., Galeano Nunez, D. C., Zibrowius, B., Schmidt, W., & Schüth, F. (2014). Highly microporous monodisperse silica spheres synthesized by the Stöber process. Microporous and Mesoporous Materials, 200, 317-325. doi:10.1016/j.micromeso.2014.07.051.

引用: https://hdl.handle.net/11858/00-001M-0000-0024-3BE5-E

要旨

Silica spheres that are prepared by the Stöber process are usually considered non-porous. Here we report on a slightly modified synthesis protocol that allows preparation of microporous Stöber particles. Successive treatment with water and alcohol at room temperature results in substantial reorganization of the silica within the Stöber particles. Hydrolysis of alkoxy groups as well as condensation and re-esterification of silanol groups upon re-immersion in alcohol are crucial for that process. As the result of the silica reorganization, micropore channels are formed within the particles. After a final washing with water to remove all alkoxy groups from the particles, pure microporous silica spheres are obtained. The total pore volumes of these materials are comparable to those of zeolitic materials.