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Efficient Conversion of Light Cycle Oil into High-Octane-Number Gasoline and Light Olefins over a Mesoporous ZSM‑5 Catalyst
journal contribution
posted on 2017-06-16, 18:26 authored by Li Xin, Xinxin Liu, Xiaobo Chen, Xiang Feng, Yibin Liu, Chaohe YangProducing
high-octane-number (ON) gasoline and light olefins is a promising
route to valorize light cycle oil (LCO). In this work, the LCO was
mildly hydrogenated and then catalytically cracked to produce high-ON
gasoline and light olefins. Mesoporous ZSM-5 zeolite (meso-ZSM-5)
was prepared and, for the first time, was applied in this process
to crack the hydrogenated LCO (hydro-LCO). The catalytic performance
of meso-ZSM-5 was evaluated in detail under different reaction temperatures
and weight hourly space velocities (WHSVs). The results showed that,
in comparison to less than 64 wt % hydro-LCO conversion over the conventional
ZSM-5 catalyst, the novel catalyst exhibited excellent performance
in cracking hydro-LCO with quite a high conversion of 84.8 wt %, affording
a gasoline yield of 56.4 wt % and light olefin yield of 19.3 wt %
at 560 °C and 10 h–1. In addition, the conversion
behaviors of hydro-LCO components were analyzed over both the conventional
ZSM-5 and meso-ZSM-5 catalysts. Finally, on the basis of the study
of the acid and pore properties of both catalysts, a detailed intrinsic
reason for enhanced performance was elucidated. It demonstrated that
the remarkable catalytic performance of the meso-ZSM-5 catalyst was
closely related to the high diffusion of reactants and the accessibility
of acid sites.