Synthesis of MFI type ferrisilicate zeolite (Fe-MFI) nanocrystals by a dry gel conversion (DGC) method and their application to methanol to olefin (MTO) reactions
Synthesis of MFI type ferrisilicate zeolite (Fe-MFI) nanocrystals by a dry gel conversion (DGC) method and their application to methanol to olefin (MTO) reactions
复制标题
DOI：
10.1039/c6nj03538h
复制
发表时间：
2017-03
影响因子：
3.3
通讯作者：
K. Miyake;Y. Hirota;Kaito Ono;Y. Uchida;M. Miyamoto;N. Nishiyama
中科院分区：
文献类型：
--
作者：
K. Miyake;Y. Hirota;Kaito Ono;Y. Uchida;M. Miyamoto;N. Nishiyama
采用干凝胶转化法（DGC），以四丙基氢氧化铵为模板剂，合成了粒径小于100 nm的MFI型铁硅酸盐沸石（Fe-MFI）纳米晶。尽管使用相同的前体溶液，但通过DGC方法合成的Fe-MFI的晶体尺寸远小于通过常规水热合成（HTS）方法合成的Fe-MFI的晶体尺寸。考察了纳米Fe-MFI在甲醇制烯烃（MTO）反应中的催化性能。与MFI型铝硅酸盐分子筛（Al-MFI）相比，Fe-MFI催化剂的丙烯/乙烯（P/E）比值较高，轻质烷烃产率较低。此外，纳米尺寸的Fe-MFI显示出更高的P/E比（约. 30)并且比通过HTS方法合成的宏观尺寸的Fe-MFI具有更长的催化剂寿命。
We have synthesized MFI type ferrisilicate zeolite (Fe-MFI) nanocrystals with a crystal size smaller than 100 nm by a dry gel conversion (DGC) method using a sole template (tetrapropylammonium hydroxide). The crystal size of Fe-MFI synthesized by the DGC method was much smaller than that of Fe-MFI synthesized by a conventional hydrothermal synthesis (HTS) method despite using the same precursor solution. The catalytic performance of the nano-sized Fe-MFI in methanol to olefin (MTO) reactions was investigated. The Fe-MFI catalysts showed higher propylene to ethylene (P/E) ratios and lower light paraffin yields compared with MFI type aluminosilicate zeolites (Al-MFI) for both the synthesis methods. In addition, nano-sized Fe-MFI showed a higher P/E ratio (ca. 30) and a longer catalyst lifetime than macro-sized Fe-MFI synthesized by the HTS method.