Study on preparation and catalytic performance of Zn-Al oxides for tandem reaction of syngas conversion into light olefins

LI Bao-zhen; MENG Fan-hui; WANG Li-na; LI Zhong

doi:10.19906/j.cnki.JFCT.2022049

Volume 51 Issue 1

Jan. 2023

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Article Navigation > Journal of Fuel Chemistry and Technology > 2023 > 51(1): 111-119

LI Bao-zhen, MENG Fan-hui, WANG Li-na, LI Zhong. Study on preparation and catalytic performance of Zn-Al oxides for tandem reaction of syngas conversion into light olefins[J]. Journal of Fuel Chemistry and Technology, 2023, 51(1): 111-119. doi: 10.19906/j.cnki.JFCT.2022049

Citation:

LI Bao-zhen, MENG Fan-hui, WANG Li-na, LI Zhong. Study on preparation and catalytic performance of Zn-Al oxides for tandem reaction of syngas conversion into light olefins[J]. Journal of Fuel Chemistry and Technology, 2023, 51(1): 111-119. doi: 10.19906/j.cnki.JFCT.2022049

Citation:

LI Bao-zhen, MENG Fan-hui, WANG Li-na, LI Zhong. Study on preparation and catalytic performance of Zn-Al oxides for tandem reaction of syngas conversion into light olefins[J]. Journal of Fuel Chemistry and Technology, 2023, 51(1): 111-119. doi: 10.19906/j.cnki.JFCT.2022049

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Study on preparation and catalytic performance of Zn-Al oxides for tandem reaction of syngas conversion into light olefins

doi: 10.19906/j.cnki.JFCT.2022049

Taiyuan University of Technology, State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan 030024, China

Funds: The project was supported by the Natural Science Foundation of Shanxi Province (202103021224073) and the Key Research and Development Project of Shanxi Province (201803D421011)

Received Date: 2022-05-20
Accepted Date: 2022-06-16
Rev Recd Date: 2022-06-11

Available Online: 2022-09-26

Publish Date: 2023-01-10

Abstract

Abstract

A series of Zn-Al oxides with different Zn/Al atomic ratios were prepared by the microwave-assisted evaporation-induced self-assembly (M-EISA) method, using industrial pseudo-boehmite as aluminum source. The prepared Zn-Al oxides were physically mixed with SAPO-18 zeolite and applied in tandem reaction for direct conversion of syngas to light olefins (${\rm{C}}_2^= -{\rm{C}}_4^= $). X-ray diffraction (XRD), transmission electron microscopy (TEM), N₂ adsorption-desorption, CO and H₂ temperature-programmed desorption (CO-TPD, H₂-TPD) and X-ray photoelectron spectroscopy (XPS) were selected for characterization. As the increase of Zn/Al ratio, the specific surface area and pore volume of Zn-Al oxides gradually decreased, while the average pore diameter firstly increased and then decreased. Compared with the ZnAl-IP prepared by the impregnation (IP) method, the ZnAl₂O_x with the Zn/Al ratio of 1∶2 had a high dispersion of Zn and formed the ZnAl₂O₄ spinel structure that produced more oxygen vacancies. The catalytic results showed that the activity of Zn-Al samples prepared by M-EISA method firstly increased and then decreased as the Zn/Al ratio rose, while the ${\rm{C}}_2^= -{\rm{C}}_4^= $ selectivity gradually decreased. ZnAl₂O_x sample exhibited the highest CO conversion of 34.8% and almost no obvious deactivation after 50 h reaction, furthermore, its catalytic performance was much better than that of ZnAl-IP sample.
- syngas conversion,
- light olefins,
- Zn-Al oxide,
- bifunctional catalyst,
- microwave-assisted evaporation-induced self-assembly method

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References(47)

References

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