Structural Defects Induced in ETS-10 by Postsynthesis Treatment with H2O2 Solution
Structural Defects Induced in ETS-10 by Postsynthesis Treatment with H2O2 Solution
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DOI：
10.1021/cm052261j
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发表时间：
2006-07
影响因子：
8.6
通讯作者：
C. C. Pavel-C.;So-Hyun Park;A. Dreier;B. Tesche;W. Schmidt
中科院分区：
文献类型：
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作者：
C. C. Pavel-C.;So-Hyun Park;A. Dreier;B. Tesche;W. Schmidt
ETS-10钛硅酸盐中结构缺陷的存在对其吸附能力和催化活性有重要影响，例如在有机分子的光催化中。在本工作中，我们使用过氧化氢的合成后处理来在ETS-10结构中引入不同程度的缺陷。诱导缺陷的数量依赖于过氧化氢的浓度和暴露时间。这些处理导致钛原子的部分去除，导致二氧化钛链的中断，从而形成更大的微孔(超微孔)，而不会显著降低结晶度。高分辨吸附实验表明，经H_2O_2处理后的ETS-10微孔体积略有增加，孔径呈双峰分布。通过透射电子显微镜直接观察到结构中超微孔的存在。结果表明，Ti-−-O-−-Ti链的断裂和新的可及性的形成是可能的。
The presence of structural defects in ETS-10 titanosilicate plays an important role in its adsorption capacity and catalytic activity, e.g., in photocatalysis of organic molecules. In the present work, we used postsynthesis treatments with hydrogen peroxide to introduce different levels of defects in the ETS-10 structure. The number of defects induced was dependent on the concentration of H2O2 and exposition time. These treatments led to a partial removal of Ti atoms, resulting in the interruption of titania chains and the consequent formation of larger micropores (supermicropores) without substantial degradation of crystallinity. High-resolution sorption experiments indicate that the micropore volume was slightly increased after H2O2 treatment, and a bimodal pore size distribution was observed for the modified ETS-10 samples. The presence of supermicropores in the structure was directly visualized by transmission electron microscopy. The interruption of Ti−O−Ti chains and the formation of new accessible ...