Direct conversion of syngas into gasoline fuel over Zn-ZrO2/H-ZSM-5 bifunctional catalysts
HE Shun, SHEN Zheng, CHANG Haohao, LIU Zhiming, KANG Jincan*, ZHANG Qinghong, WANG Ye
(College of Chemistry and Chemical Engineering, National Engineering Laboratory for Green Chemical Productions of Alcohols, Ethers and Esters, Xiamen University, Xiamen 361005, Fujian, China)
Abstract:
Hybrid catalysts combined Zn-ZrO2 oxide with different zeolites were synthesized and used for the direct conversion of syngas. It was found that the Zn-ZrO2/H-ZSM-5 catalyst 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-ZrO2 oxide and Zn-ZrO2/H-ZSM-5 were further investigated, and the results suggested that methanol and dimethyl ether intermediates were firstly formed over Zn-ZrO2 and then further transformed into gasoline fuel over H-ZSM-5 zeolite. The Zn/Zr molar ratio and Si/Al molar ratio of H-ZSM-5 over Zn-ZrO2/H-ZSM-5 bifunctional catalyst were also studied. The results showed that the Zn/Zr molar ratio at 1∶32 and the Si/Al ratio of H-ZSM-5 at 200 over Zn-ZrO2/H-ZSM-5 were beneficial to the conversion of syngas and the formation of gasoline fuel. Moreover, the catalyst was stable, there was no significant deactivation in 100 h.
KeyWords:
syngas conversion; gasoline fuel; bifunctional catalyst; Zn-ZrO2 oxides; H-ZSM-5 zeolite
