Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan.
Phys Chem Chem Phys. 2014 Mar 7;16(9):4155-64. doi: 10.1039/c3cp54297a.
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 (27)Al 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.
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外，我们还发现更简单的有机胺，如 N-甲基哌啶和吡啶，可以替代 PMP 作为替代 OSDA。此外，我们已经建立了一种无需使用任何 OSDA 制备 RTH 型沸石的合成方法。在这项研究中，使用不同类型的 OSDA 或不使用任何 OSDA 合成了 RTH 型硅铝酸盐。使用各种技术，特别是使用 CO 吸附的高分辨率 (27)Al MAS NMR 和原位 FT-IR 技术对使用不同制备方法合成的沸石进行了表征。讨论了制备方法与甲醇制烯烃 (MTO) 反应中催化性能之间的关系。最后，阐明了 RTH 骨架中 Al 物种的分布。
