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

被引：0
|
作者：
Li B.-Z. [1 ]
Meng F.-H. [1 ]
Wang L.-N. [1 ]
Li Z. [1 ]
机构：
[1] Taiyuan University of Technology, State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan
来源：
Ranliao Huaxue Xuebao/Journal of Fuel Chemistry and Technology | 2023年 / 51卷 / 01期
关键词：
bifunctional catalyst; light olefins; microwave-assisted evaporation-induced self-assembly method; syngas conversion; Zn-Al oxide;
D O I：
10.19906/j.cnki.JFCT.2022049
中图分类号：
学科分类号：
摘要：
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 (C=2 − 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 ZnAl2Ox 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 C=2 − C=4 selectivity gradually decreased. ZnAl2Ox 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. © 2023 Science Press. All rights reserved.
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页码：110 / 119
页数：9
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