Abstract
Pore-expanded MCM-41 (PE-MCM-41) silica was obtained via a two-step strategy consisting of synthesis of MCM-41 in the presence of cetyltrimethylammonium cations (CTMA+) followed by hydrothermal treatment in the presence of an aqueous suspension of dimethyldecylamine (DMDA). It is believed that the two surfactants self-organize into concentric cylinders comprised of an inverted DMDA micelle within a regular CTMA+ micelle. The amine head groups point towards the pore center, thus creating a hydrophilic channel within the pores. Selective extraction of DMDA afforded PE-MCM-41E, a highly porous material with hydrophobic surface. Calcination of as-synthesized PE-MCM-41 or PE-MCM-41E gave rise to PE-MCM-41C which exhibits a unique combination of large pores (up to 20 nm), large pore volume (up to 3.5 cm3/g) and large surface area, often exceeding 1000 m2/g. All three mesophases were used as starting materials for the development of innovative catalysts and adsorbents. Moreover, post-synthesis alumination of PE-MCM-41 and PE-MCM-41C led to novel large pore aluminosilicates with different Si/Al ratios, which provided new opportunities in acid and bifunctional catalysis. This contribution is an overview of the catalytic applications of pore-expanded mesoporous silica and aluminosilica.
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The financial support of the Natural Sciences and Engineering Research Council of Canada (NSERC) and the Canadian Institute of Health Research (CIHR) is acknowledged. A. S. thanks the Federal Government for the Canada Research Chair on Nanostructured Materials for Catalysis and Separation (2001–2015).
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Sayari, A., Shee, D., Al-Yassir, N. et al. Catalysis Over Pore-Expanded MCM-41 Mesoporous Materials. Top Catal 53, 154–167 (2010). https://doi.org/10.1007/s11244-009-9420-0
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DOI: https://doi.org/10.1007/s11244-009-9420-0