Citation: ZHANG Jian-li, WANG Xu, MA Li-ping, YU Xu-fei, Ma Qing-xiang, FAN Su-bing, ZHAO Tian-sheng. Preparation of layered K/Mg-Fe-Al catalysts and its catalytic performances in CO hydrogenation[J]. Journal of Fuel Chemistry and Technology, ;2017, 45(12): 1489-1498. shu

Preparation of layered K/Mg-Fe-Al catalysts and its catalytic performances in CO hydrogenation

State Key Laboratory of High-efficiency Coal Utilization and Green Chemical Engineering, Ningxia University, Yinchuan 750021, China

Corresponding author: ZHANG Jian-li, zhangjl@nxu.edu.cn ZHAO Tian-sheng, zhaots@nxu.edu.cn
Received Date: 20 July 2017
Revised Date: 26 September 2017

Fund Project: the National Natural Science Foundation of China 21666030The project was supported by the National Natural Science Foundation of China (21666030, 21366025) and the National First-Rate Discipline onstruction Project of Ningxia (Chemical Engineering and Technology)the National Natural Science Foundation of China 21366025

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A series of K promoted K/MgFeAl-HTLcs catalysts with different Mg/Fe/Al molar ratios were prepared by means of coprecipitation and impregnation method for direct synthesis of light olefins from CO hydrogenation. The samples were characterized by XRD, N₂ adsorption-desorption, SEM, TG, H₂-TPR and XPS measurements. The results show that MgFeAl-HTLcs catalyst precursors has typical layered structure. MgO, Fe₂O₃ and small amount of MgFeAlO₄ are formed after calcination. MgCO₃ and Fe₃O₄ could be observed after reaction, and a little Fe₅C₂ iron carbide with broad and weak peaks appear simultaneously. Thermal stability of K/MgFeAl-HTLcs is improved due to recovery of hydrotalcite-like structure after K promotion. With increase of Al content, specific surface area of the precursors decreases monotonically after structure reconstruction. Reduction of Fe₂O₃ to Fe₃O₄ is inhibited with addition of Al, compared with K/Mg-Fe sample. Fe enrichment before reaction and K enrichment after reaction are observed on secondary calcination samples. During CO hydrogenation, the prepared samples show high activity and C_2-4⁼ selectivity with low C₅₊ weight fraction. C₅₊ hydrocarbons decrease and olefin selectivity increases with increasing Fe/Al molar ratio. The C₅₊ decreases from 22.17% to 10.90%, and C_2-4⁼ weight content increases from 40.98% to 47.28% on K/1.5Mg-0.67Fe-0.33Al sample compared with that of K/1.5Mg-0.67Fe sample.
- Fischer-Tropsch synthesis,
- K/Mg-Fe-Al catalyst,
- CO hydrogenation,
- light olefins
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