Differences in Al distribution and acidic properties between RTH-type zeolites synthesized with OSDAs and without OSDAs
Differences in Al distribution and acidic properties between RTH-type zeolites synthesized with OSDAs and without OSDAs
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DOI：
10.1039/c3cp54297a
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发表时间：
2014-01-01
影响因子：
3.3
通讯作者：
Tatsumi, Takashi
中科院分区：
文献类型：
--
作者：
Liu, Ming;Yokoi, Toshiyuki;Tatsumi, Takashi
除了使用1，2，2，6，6-五甲基哌啶（PMP）作为有机结构导向剂（OSDA）的RTH型沸石的原始制备路线之外，我们已经发现更简单的有机胺如N-甲基哌啶和吡啶可以代替PMP用作替代OSDA。此外，我们还建立了一种不使用OSDA的合成方法来制备RTH型沸石。在这项研究中，RTH型铝硅酸盐合成与不同类型的OSDA或不使用任何OSDA。采用高分辨Al-27 MAS NMR和CO吸附原位FT-IR技术对不同制备方法合成的沸石进行了表征。讨论了制备方法与催化剂在甲醇制烯烃反应中性能的关系。最后，Al物种在RTH框架中的分布被澄清。
In addition to the original preparation route of the RTH-type zeolites using 1,2,2,6,6-pentamethylpiperidine (PMP) as an organic structure directing agent (OSDA), we have found that simpler organic amines such as N-methylpiperidine and pyridine can be used as alternative OSDAs in place of PMP. Furthermore, we have established a synthesis method for preparing the RTH-type zeolites without using any OSDAs. In this study, RTH-type aluminosilicates were synthesized with different types of OSDA or without using any OSDAs. The obtained zeolites synthesized with different preparation methods were characterized by using various techniques, especially high-resolution Al-27 MAS NMR and in situ FT-IR techniques using CO adsorption. The relationship between the preparation method and the catalytic performance in the methanol to olefins (MTO) reaction was discussed. Finally, the distribution of Al species in the RTH-framework was clarified.