Structure and Basicity of Microporous Titanosilicate ETS-10 and Vanadium-Containing ETS-10
Structure and Basicity of Microporous Titanosilicate ETS-10 and Vanadium-Containing ETS-10
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微孔钛硅酸盐ETS-10和含钒ETS-10的结构和碱度
DOI：
10.1021/jp305543m
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发表时间：
2012-08
影响因子：
3.7
通讯作者：
Li, Can
中科院分区：
文献类型：
--
作者：
Hofmann, Jan P.;Weckhuysen, Bert M.;Hensen, Emiel J. M.;Li, Can
ETS-10作为一种碱催化剂引起了广泛的关注。最好确定基本地点的位置。钒取代的ETS-10还有一个有趣的特点，即Ti可以在不改变其拓扑结构的情况下被V完全取代。对于了解ETVS-10的性质和反应性，对V取代后的局部环境进行表征是非常重要的。采用吸收乙炔和一氧化碳作为分子探针的拉曼光谱和红外光谱相结合的方法，研究了纯钛硅酸盐ETVS-10和一系列不同骨架V含量的钒取代ETVS-10的结构和酸碱性质。在ETS-10结构中，高达70%的Ti原子被V取代，使得ETVS-10材料具有均匀的Ti和V种分布。在较高的V浓度下，富钒畴之间观察到明显的相分离。用FTIR光谱分析了ETVS-10的固有碱度。
ETS-10 has attracted considerable attention as a base catalyst. It is desirable to confirm the location of basic sites. Vanadium-substituted ETS-10 also attracts much attention for the interesting feature that the Ti can be fully replaced by V without changing its topology. It is important to characterize the local environment upon V substitution for understanding the property and reactivity of ETVS-10. The structural and acid–base properties of pure titanosilicate ETS-10 and a series of vanadium-substituted ETVS-10 with different framework V content were studied by a combination of Raman spectroscopy and FTIR of absorbed acetylene and carbon monoxide as molecular probes. The substitution of up to 70% of Ti atoms with V in the structure of ETS-10 results in ETVS-10 materials with a homogeneous distribution of Ti and V species. At higher V concentrations, a distinct phase separation between the vanadium-rich domains is observed. The intrinsic basicity of ETVS-10 as revealed by FTIR spectroscopy of adsorbed...
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