THE STATE OF TI IN TITANOALUMINOSILICATES ISOMORPHOUS WITH ZEOLITE-BETA
THE STATE OF TI IN TITANOALUMINOSILICATES ISOMORPHOUS WITH ZEOLITE-BETA
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DOI：
10.1021/ja00078a020
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发表时间：
1993-12-15
影响因子：
15
通讯作者：
PEREZPARIENTE, J
中科院分区：
文献类型：
--
作者：
BLASCO, T;CAMBLOR, MA;PEREZPARIENTE, J
采用直接法合成了一种在温和条件下具有烃类氧化活性的大孔含钛沸石。这是同晶型的β沸石，和碱金属阳离子的产品上的关键作用已被描述。通过IR光谱、XRD、热分析、XPS、EXAFS-XANES和DRS-UV技术，已经表明在没有碱金属阳离子的情况下进行的合成导致具有位于骨架位置的Ti的β沸石。结果使我们能够提出一个模型，它解释了不同的钛协调作为制造和煅烧样品，水合和脱水。该模型与TS-1和TS-2结构的文献数据一致。
A large-pore Ti-containing zeolite, which is active for hydrocarbon oxidation at mild conditions, has been obtained by direct synthesis. This is isomorphous with zeolite beta, and the crucial effect of alkali metal cations on the product has been described. By means of IR spectroscopy, XRD, thermal analysis, XPS, EXAFS-XANES, and DRS-UV techniques, it has been shown that the synthesis carried out without alkali metal cations leads to zeolite beta with Ti located in the framework positions. The results allow us to propose a model which explains the varying Ti coordination for as-made and calcined samples, hydrated and dehydrated. The model is consistent with the literature data on TS-1 and TS-2 structures.