Study on MFI-Type Zeolites for Catalytic Thermal Cracking of Butane to Produce Light Olefins
WANG Ge1, ZHANG Yongze2, ZENG Tucheng1, LIU Yunbo1, WANG Pengzhao1
1. College of Chemical Engineering, Fuzhou University, Fuzhou 350108, China;
2. Lanzhou Petrochemical Research Center, Petrochemical Research Institute, PetroChina, Lanzhou 730060, China
Abstract：Catalytic pyrolysis of light alkanes to produce light olefins is a crucial approach for enhancing alkane utilization efficiency and generating high value-added ethylene and propylene. The reaction network is intricate, with hydrogen transfer reactions significantly influencing products distribution. This study is devoted to elucidate the effect of hydrogen transfer activity on olefin selectivity, and prepare alkanes catalytic pyrolysis catalysts with high selectivity and yield of low carbon olefin. In this study, MFI zeolite catalysts with varying aluminum contents were synthesized through hydrothermal method, secondly, Ba doped high-silica ZSM-5 were synthesized through hydrothermal method and mechanical ball-milling method. It was observed that reducing aluminum content in zeolite led to a decrease in both the amount and strength of acid sites, thereby inhibiting the generation of alkane byproducts from light olefins via hydrogen transfer reactions and increasing the yield of light olefins. Compared to low silicon-aluminum ratios ZSM-5 zeolite, high-silica ZSM-5 zeolite exhibited higher yields of light olefins. Doping 1% Ba into high-silica ZSM-5 zeolite further attenuated surface acidity, suppressed hydrogen transfer reactions, and enhanced the production of light olefins. The Ba/ZSM-5 catalyst prepared by mechanical ball-milling method yielded a remarkable 54% yield of ethylene and propylene.
WANG Ge,ZHANG Yongze,ZENG Tucheng et al. Study on MFI-Type Zeolites for Catalytic Thermal Cracking of Butane to Produce Light Olefins[J]. Chemical Reaction Engineering and Technology, 2024, 40(4): 298-305.
