SCI和EI收录∣中国化工学会会刊

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 Wu2,3   

  1. 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 Wu2,3   

  1. 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: 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