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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 HCl 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 Fe 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.

journal of environmental science and engineering. b

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