A new approach to the determination of atomic-architecture of amorphous zeolite precursors by high-energy X-ray diffraction technique.
A new approach to the determination of atomic-architecture of amorphous zeolite precursors by high-energy X-ray diffraction technique.
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DOI：
10.1039/b512840d
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发表时间：
2006-12
期刊：
影响因子：
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通讯作者：
T. Wakihara;S. Kohara;G. Sankar;Seijiro Saito;M. Sánchez-Sánchez-M.-Sánchez-Sánchez-1398732651;A. Overweg;W. Fan;M. Ogura;T. Okubo
中科院分区：
文献类型：
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作者：
T. Wakihara;S. Kohara;G. Sankar;Seijiro Saito;M. Sánchez-Sánchez-M.-Sánchez-Sánchez-1398732651;A. Overweg;W. Fan;M. Ogura;T. Okubo
采用高能X-射线衍射（HEXRD）测定了在水热条件下形成的无定形前体物质在微孔铝硅酸盐沸石结晶开始之前的结构。调查，结合使用的反向蒙特卡罗模拟表明，偶数环，特别是4 R（R：环）和6 R，这是占主导地位的铝硅酸盐环沸石A，已经产生的前体。该模型表明，双4 Rs的形成发生在沸石A的结晶的最后一步。
The structure of amorphous precursor species formed under hydrothermal conditions, prior to the onset of crystallization of microporous aluminosilicate zeolites, is determined employing high-energy X-ray diffraction (HEXRD). The investigation, combined with the use of reverse Monte Carlo modelling suggests that even numbered rings, especially 4R (R: ring) and 6R, which are the dominant aluminosilicate rings in zeolite A, have already been produced in the precursor. The model implies that the formation of double 4Rs occurs at the final step of the crystallization of zeolite A.