Precise Control in Characteristics of Nano-particulate MFI-Type Ferrisilicate and Their Catalysis in the Conversion of Dimethyl Ether into Light Olefins  

作　　者：Hiroki Kobayashi Masafumi Nakaya Kiyoshi Kanie Atsushi Muramatsu 

机构地区：[1]School of Engineering, Tohoku University, Sendai 980-8579, Japan [2]Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan

出　　处：《Journal of Environmental Science and Engineering(B)》2015年第1期1-8,共8页环境科学与工程（B）

摘　　要：This study reports the synthesis of size-controlled Fe-MFI （Fe-substituted zeolites with the MFI topology） and their catalytic performances for DTO （dimethyl ether-to-olefins） reaction. The amount of HC1 and aging temperature were decisive factors to control the particle size of Fe-MFI in the range of 50 nm to 600 nm. The introduction of Fe3＋ ions into the zeolitic framework was confirmed by UV （ultraviolet）-visible spectroscopy. In addition, it was observed that the strength of acid site in prepared Fe-MFI was weaker than that of commercial ZSM-5. With decrease in the particle size, the amount of deposited coke decreased so that the catalyst life for the DTO reaction was well promoted. The present catalysts showed the higher light-olefin selectivity （C2= ＋ C3= ＋ C4=） than commercial ZSM-5 catalysts mainly due to the suppression of the formation of paraffins; however, the Fe-MFI catalysts were deactivated rapidly because of their low activity for the cracking of alkenes.

关 键 词：Nanosized Fe-MFI ZSM-5 dimethyl ether-to-olefin reaction light-olefin selectivity. 

分 类 号：TQ221.2[化学工程—有机化工] TH134[机械工程—机械制造及自动化]