Acidic and adsorptive properties of SBA-15 modified by aluminum incorporation
Acidic and adsorptive properties of SBA-15 modified by aluminum incorporation
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DOI：
10.1016/j.micromeso.2008.12.023
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发表时间：
2009-05
影响因子：
5.2
通讯作者：
B. Drăgoi;E. Dumitriu;C. Guimon;A. Auroux
中科院分区：
文献类型：
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作者：
B. Drăgoi;E. Dumitriu;C. Guimon;A. Auroux
本文合成了不同Si/Al比的Al-SBA-15样品，并以三嵌段共聚物P123为表面活性剂，采用直接合成法和后合成法将Al引入到介孔SBA-15结构中。使用不同的技术，如：XRD，孔径分布，27 Al MAS NMR和XPS表征多孔固体。酸性质估计吸附和滴定微量热法，分别。在第一种情况下使用氨和吡啶作为探针分子，而在第二种情况下使用正癸烷中的苯胺。吡啶吸附的FT-IR和氨吸附的XPS完成了酸性质的表征。酸度的增加与铝的掺入被证明;较低的Si/Al比导致更高的酸度的样品。微量热法也被用来测试这些介孔材料对污染物，如甲乙酮，丙醛和乙腈（气相）和尼古丁（水相）的吸附性能。与其他两种分子相比，酮被更好地保留。关于尼古丁，其吸附受到固体中铝含量的强烈影响;铝的量越高，尼古丁的吸附越低。
In this work, Al-SBA-15 samples with different Si/Al ratios were synthesized; Al was incorporated in the mesoporous SBA-15 structure either using the direct synthesis method, with tri-block copolymer P123 as surfactant, or by the post-synthesis method. The porous solids were characterized using different techniques, such as: XRD, pore size distribution,27Al MAS NMR, and XPS. Acidic properties were estimated by adsorption and titration microcalorimetry, respectively. Ammonia and pyridine were used as probe molecules in the first case, while aniline in n-decane was used in the second one. FT-IR of pyridine adsorption and XPS of ammonia adsorption completed the characterization of acid properties. The increase of acidity with the incorporation of aluminum was evidenced; lower Si/Al ratios led to higher acidity of the sample. Microcalorimetry was also used to test the adsorption properties of these mesoporous materials toward pollutants such as methyl ethyl ketone, propionaldehyde and acetonitrile (in gas phase) and nicotine (in aqueous phase). The ketone was better retained in comparison to the other two molecules. Regarding nicotine, its adsorption was strongly influenced by the aluminum content in the solids; the higher the quantity of aluminum, the lower the adsorption of nicotine.