Gas phase synthesis of titania with aerogel character and its application as a support in oxidation catalysis
Gas phase synthesis of titania with aerogel character and its application as a support in oxidation catalysis
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DOI：
10.1039/c0jm00769b
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发表时间：
2010-11
影响因子：
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通讯作者：
Stefan Dilger;C. Hintze;M. Krumm;C. Lizandara-Pueyo;S. Deeb;S. Proch;S. Polarz
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文献类型：
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作者：
Stefan Dilger;C. Hintze;M. Krumm;C. Lizandara-Pueyo;S. Deeb;S. Proch;S. Polarz
具有类似于气凝胶的结构的二氧化钛材料在当前的贡献中呈现。与经典路线相反，这里讨论的气凝胶状TiO 2材料仅通过高温气溶胶过程制备。因此，形成网络的二氧化钛颗粒是高纯度、高结晶的，并且它们的表面不含任何添加剂。它示出的材料的结构（粒度，孔隙率，表面积，结晶度，和相组成）取决于不同的参数（温度梯度，前体浓度，停留时间等）的复杂的相互作用。然而，对这些相关性的理解使得能够制备具有气凝胶状结构的定制的二氧化钛材料。初级纳米晶体颗粒的尺寸可以从13 nm到70 nm系统地变化。关于两种不同晶相金红石和金红石的组成可以作为独立参数进行调节。最后，将Au团簇负载到气凝胶状TiO2材料上，考察其氧化催化活性。
Titania materials with structures resembling aerogels are presented in the current contribution. In contrast to the classical routes the aerogel-like TiO2 materials discussed here are prepared exclusively by a high-temperature aerosol process. Thus, the titania particles forming the network are highly pure, highly crystalline and their surfaces are free of any additives. It is shown that the structure of the materials (particle-size, porosity, surface area, crystallinity, and phase composition) depends on a complex interplay of different parameters (temperature gradients, precursor concentration, residence time, etc.). However, the understanding of those correlations enables the preparation of tailor made titania materials with aerogel-like structure. The size of the primary, nanocrystalline particles can be varied systematically from 13 nm to 70 nm. The composition regarding the two different crystalline phases anatase and rutile can be adjusted as an independent parameter. Finally, the aerogel-like TiO2 materials were loaded with Au clusters and the activity in oxidation catalysis was investigated.