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首页> 外文期刊>Microporous and mesoporous materials: The offical journal of the International Zeolite Association >Synthesis of aluminum-containing hierarchical mesoporous materials with columnar mesopore ordering by evaporation induced self assembly
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Synthesis of aluminum-containing hierarchical mesoporous materials with columnar mesopore ordering by evaporation induced self assembly

机译：蒸发诱导自组装法制备柱状介孔有序的含铝分级介孔材料

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摘要

The incorporation of aluminum into the silica columns of hierarchical mesoporous materials (HMMs) was studied. The HMMs were synthesized by a combination of hard and soft templating methods, forming mesoporous SBA-15-type silica columns inside the pores of anodic aluminum oxide membranes via evaporation induced self-assembly (EISA). By adding Al-isopropoxide to the EISA-mixture a full tetrahedral incorporation of Al and thus the creation of acid sites was achieved, which was proved by nuclear magnetic resonance spectroscopy. Electron microscopy showed that the use of Al-isopropoxide as an Al source for the HMMs led to a change in the mesopore ordering of silica material from circular hexagonal (donut-like) to columnar hexagonal and a 37% increase in specific surface (BET surface). These results were confirmed by a combination of nitrogen physisorption and small-angle X-ray scattering experiments and can be attributed to a swelling of the P123 micelles with isopropanol. The columnar mesopore ordering of silica is advantageous towards the pore accessibility and therefore preferential for many possible applications including catalysis and adsorption on the acid tetrahedral Al-sites. (C) 2016 Elsevier Inc. All rights reserved.
机译：研究了铝向分级介孔材料（HMM）硅胶柱中的结合。通过硬模板法和软模板法的组合来合成HMM，通过蒸发诱导自组装（EISA）在阳极氧化铝膜孔内形成介孔SBA-15型硅胶柱。通过将异丙醇铝添加到EISA混合物中，完全掺入Al的四面体，从而实现了酸位的生成，这已通过核磁共振波谱证明。电子显微镜显示，使用异丙醇铝作为HMM的铝源导致二氧化硅材料的中孔有序从圆形六角形（甜甜圈状）变为圆柱状六角形，比表面积（BET表面）增加了37％ ）。这些结果通过氮物理吸附和小角度X射线散射实验的结合得到证实，并且可以归因于P123胶束与异丙醇的溶胀。二氧化硅的柱状中孔有序对孔的可达性有利，因此优先用于许多可能的应用，包括在酸性四面体Al位上的催化和吸附。 （C）2016 Elsevier Inc.保留所有权利。

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