Citation: ZHENG Jin-nan, AN Kang, WANG Jia-ming, LI Jing, LIU Yuan. Direct synthesis of ethanol via CO₂ hydrogenation over the Co/La-Ga-O composite oxide catalyst[J]. Journal of Fuel Chemistry and Technology, ;2019, 47(6): 697-708. shu

Direct synthesis of ethanol via CO₂ hydrogenation over the Co/La-Ga-O composite oxide catalyst

ZHENG Jin-nan ^1,2 ,
AN Kang ^1,2 ,
WANG Jia-ming ^1,2 ,
LI Jing ^1,2 ,
LIU Yuan ^1,2,,

1.
School of Chemical Engineering, Tianjin University Tianjin Key Laboratory of Applied Catalysis Science and Technology, Tianjin 300072, China
2.
Collaborative Innovation Center of Chemical Science and Engineering(Tianjin), Tianjin 300072, China

Corresponding author: LIU Yuan, yuanliu@tju.edu.cn
Received Date: 26 February 2019
Revised Date: 27 March 2019

Fund Project: the National Natural Science Foundation of China 21872101The project was supported by the National Natural Science Foundation of China (21872101, 21576192)the National Natural Science Foundation of China 21576192

Figures(10)

A new Co/La₂O₃-La₄Ga₂O₉ catalyst was prepared by reducing LaCo_1-xGa_xO₃ perovskite and used in the direct synthesis of ethanol from CO₂ hydrogenation. The composite catalyst was characterized by XRD, XPS, TPD and TEM and its catalytic performance in CO₂ hydrogenation was investigated in a micro fixed-bed reactor operated at 230-290℃, 3 MPa, gas hourly space velocity (GHSV) of 3000 mL/(g_cat·h) and H₂/CO₂ molar ratio of 3.0. The results indicate that the Co/La-Ga-O composite oxide catalyst exhibits high selectivity to ethanol in CO₂ hydrogenation. In comparison with the LaCoO₃ catalyst, the incorporation of Ga dopant can inhibit the formation of CH₄ and then promote the production of alcohols, especially ethanol. With a Co/Ga atomic ratio of 7:3, the Co/La-Ga-O composite oxide catalyst displays the best performance in CO₂ hydrogenation, with a CO₂ conversion of 9.8%, a selectivity of 74.7% to total alcohols and ethanol content of 88.1% (mass ratio) in the alcohols mixture. On the basis of the experimental results, it is speculated that the synergistic effect of surface Co⁰ and Co^δ+ may contribute to the excellent performance of the Co/La₂O₃-La₄Ga₂O₉ catalyst in CO₂ hydrogenation to ethanol.
- carbon dioxide hydrogenation,
- ethanol synthesis,
- perovskite-type oxide,
- cobalt,
- gallium
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Direct synthesis of ethanol via CO2 hydrogenation over the Co/La-Ga-O composite oxide catalyst

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Direct synthesis of ethanol via CO₂ hydrogenation over the Co/La-Ga-O composite oxide catalyst