Hydrothermal hydrogenation/deoxygenation of palmitic acid to alkanes over Ni/activated carbon catalyst

doi:10.1016/j.cjche.2023.08.009

中国化学工程学报 ›› 2024, Vol. 66 ›› Issue (2): 8-18.DOI: 10.1016/j.cjche.2023.08.009

• Full Length Article • 上一篇下一篇

Hydrothermal hydrogenation/deoxygenation of palmitic acid to alkanes over Ni/activated carbon catalyst

Min Lin¹, Yuhao Yan¹, Xiaoxian Li², Rui Li¹, Yulong Wu^2,3

1. MOE Engineering Center of Forestry Biomass Materials and Bioenergy, Beijing Forestry University, Beijing 100083, China;
2. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China;
3. Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education, Tsinghua University, Beijing 100084, China

收稿日期:2023-01-05 修回日期:2023-06-18 出版日期:2024-02-28 发布日期:2024-04-20
通讯作者: Rui Li,E-mail:lirui@bjfu.edu.cn;Yulong Wu,E-mail:wylong@tsinghua.edu.cn
基金资助:
The authors are grateful for the financial support from National Natural Science Foundation of China (21838006 and 21776159), and National Key Research and Development Program of China (2018YFC1902101).

Hydrothermal hydrogenation/deoxygenation of palmitic acid to alkanes over Ni/activated carbon catalyst

Min Lin¹, Yuhao Yan¹, Xiaoxian Li², Rui Li¹, Yulong Wu^2,3

1. MOE Engineering Center of Forestry Biomass Materials and Bioenergy, Beijing Forestry University, Beijing 100083, China;
2. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China;
3. Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education, Tsinghua University, Beijing 100084, China

Received:2023-01-05 Revised:2023-06-18 Online:2024-02-28 Published:2024-04-20
Contact: Rui Li,E-mail:lirui@bjfu.edu.cn;Yulong Wu,E-mail:wylong@tsinghua.edu.cn
Supported by:
The authors are grateful for the financial support from National Natural Science Foundation of China (21838006 and 21776159), and National Key Research and Development Program of China (2018YFC1902101).

摘要/Abstract

摘要： To produce paraffin from hydrogenation/deoxygenation of palmitic acid, model compound of bio-oil obtained by hydrothermal liquefaction (HTL) of microalgaehas been an attractive focus in recent years. In order to avoid energy-intensive separation process of water and bio-oil, it is of importance that deoxygenation upgrading of fatty acids under hydrothermal conditions similar to HTL process. Herein, it is the first time to explore the application of activated carbon (AC)-supported non-noble-metal catalysts, such as Ni, Co, and Mo, and so on, in the hydrothermal hydrogenation/deoxygenation of long-chain fatty acids, and the obtained Ni/AC–H (the Ni/AC was further H₂ pre-reduced) is one of the best catalysts. In addition, it is found that the catalytic activity can be further improved by H₂ pre-reduction of catalyst. Characterization results that are more low valences of nickel and oxygen vacancy can be obtained after H₂ pre-reduction, thus significant promoting the deoxygenation especially the decarbonylation pathway of fatty acids. The total alkanes yield can reaches 95.9 % at optimal conditions (280°C, 360min). This work confirmed that the low-priced AC-supported non-noble-metal catalysts have great potential compared with the noble-metal catalyst, in hydrothermal upgrading of bio-oil.

关键词: Bio-oil, Fatty acids, Deoxygenation, Hydrothermal upgrading

Abstract: To produce paraffin from hydrogenation/deoxygenation of palmitic acid, model compound of bio-oil obtained by hydrothermal liquefaction (HTL) of microalgaehas been an attractive focus in recent years. In order to avoid energy-intensive separation process of water and bio-oil, it is of importance that deoxygenation upgrading of fatty acids under hydrothermal conditions similar to HTL process. Herein, it is the first time to explore the application of activated carbon (AC)-supported non-noble-metal catalysts, such as Ni, Co, and Mo, and so on, in the hydrothermal hydrogenation/deoxygenation of long-chain fatty acids, and the obtained Ni/AC–H (the Ni/AC was further H₂ pre-reduced) is one of the best catalysts. In addition, it is found that the catalytic activity can be further improved by H₂ pre-reduction of catalyst. Characterization results that are more low valences of nickel and oxygen vacancy can be obtained after H₂ pre-reduction, thus significant promoting the deoxygenation especially the decarbonylation pathway of fatty acids. The total alkanes yield can reaches 95.9 % at optimal conditions (280°C, 360min). This work confirmed that the low-priced AC-supported non-noble-metal catalysts have great potential compared with the noble-metal catalyst, in hydrothermal upgrading of bio-oil.

Key words: Bio-oil, Fatty acids, Deoxygenation, Hydrothermal upgrading

Min Lin, Yuhao Yan, Xiaoxian Li, Rui Li, Yulong Wu. Hydrothermal hydrogenation/deoxygenation of palmitic acid to alkanes over Ni/activated carbon catalyst[J]. 中国化学工程学报, 2024, 66(2): 8-18.

Min Lin, Yuhao Yan, Xiaoxian Li, Rui Li, Yulong Wu. Hydrothermal hydrogenation/deoxygenation of palmitic acid to alkanes over Ni/activated carbon catalyst[J]. Chinese Journal of Chemical Engineering, 2024, 66(2): 8-18.

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Hydrothermal hydrogenation/deoxygenation of palmitic acid to alkanes over Ni/activated carbon catalyst

Hydrothermal hydrogenation/deoxygenation of palmitic acid to alkanes over Ni/activated carbon catalyst

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