Investigating the Role of Zeolite Nanocrystal Seeds in the Synthesis of Mesoporous Catalysts with Zeolite Wall Structure
Investigating the Role of Zeolite Nanocrystal Seeds in the Synthesis of Mesoporous Catalysts with Zeolite Wall Structure
复制标题
研究沸石纳米晶晶种在合成具有沸石壁结构的介孔催化剂中的作用
DOI：
10.1021/cm201619y
复制
发表时间：
2011-10-25
影响因子：
8.6
通讯作者：
Yeung, King Lun
中科院分区：
文献类型：
--
作者：
Wang, Xiaobin;Zhang, Xiongfu;Yeung, King Lun
以沸石结构导向剂（TPA（+））和致孔剂（CTA（+））为原料，采用水热转化法制备了介孔二氧化钛-二氧化硅催化剂。在添加和不添加沸石晶种的情况下进行合成（即，TS-1和Sil-1纳米晶体）。在沸石晶种存在下制备的催化剂具有更大比例的四面体配位的钛，这与TOF-SIMS和FTIR对沸石SBU碎片和环结构的检测结果有很好的相关性。钛硅酸盐和沸石结构单元在介孔壁中的引入解释了这些催化剂较好的活性和稳定性（Ti-MT 1和Ti-MS 1）与通过常规方法制备的催化剂（Ti-MCM-41）相比。由TS-1和Sil-1沸石晶种制备的催化剂的反应性的相似性消除了晶种仅仅是结合在孔壁中的沸石片段的来源的想法，而是表明晶种起到稳定和促进SBU从溶液中结合的积极作用。
Mesoporous titania-silica catalysts were prepared by hydrothermal conversion from synthesis solutions containing a zeolite structure directing agent (TPA(+)) and a porogen (CTA(+)). Syntheses were carried out with and without addition of zeolite seeds (i.e., TS-1 and Sil-1 nanocrystals). Catalysts prepared in the presence of zeolite nanocrystal seeds have greater proportions of tetrahedrally coordinated titanium, which correlate well with the detection of zeolite SBU fragments and ring-structure by TOF-SIMS and FTIR The incorporation of titano-silicates and zeolite structural units in the mesopore walls could explain the better activity and stability of these catalysts (Ti-MT1 and Ti-MS1) compared to the catalyst prepared by the conventional method (Ti-MCM-41). The similarity in the reactivity of catalysts prepared from TS-1 and Sil-1 nanocrystal seeds dispels the idea that the seeds are merely a source of the zeolite fragments incorporated in the pore walls but instead suggests that the seeds play an active role to stabilize and promote the incorporation of SBU from the solution.