Direct conversion of syngas into gasoline fuel over Zn-ZrO2/H-ZSM-5 bifunctional catalysts
Hybrid catalysts combined Zn-ZrO2oxide with different zeolites were synthesized and used for the direct conversion of syngas.It was found that the Zn-ZrO2/H-ZSM-5catalyst exhibited higher CO conversion as well as gasoline fuel selectivity than other catalysts.The effects of reaction temperature and contact time on catalytic performances over Zn-ZrO2oxide and Zn-ZrO2/H-ZSM-5were further investigated, and the results suggested that methanol and dimethyl ether intermediates were firstly formed over Zn-ZrO2and then further transformed into gasoline fuel over H-ZSM-5zeolite.The Zn/Zr molar ratio and Si/Al molar ratio of H-ZSM-5over Zn-ZrO2/H-ZSM-5bifunctional catalyst were also studied.The results showed that the Zn/Zr molar ratio at1:32and the Si/Al ratio of H-ZSM-5at 200over Zn-ZrO2/H-ZSM-5were beneficial to the conversion of syngas and the formation of gasoline fuel.Moreover, the catalyst was stable, there was no significant deactivation in 100h.
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