SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2024, Vol. 68 ›› Issue (4): 241-252.DOI: 10.1016/j.cjche.2023.07.014

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Steam reforming of acetic acid over Ni/biochar of low metal-loading: Involvement of biochar in tailoring reaction intermediates renders superior catalytic performance

Yunyu Guo1, Yiran Wang1, Shu Zhang2, Yi Wang3, Song Hu3, Jun Xiang3, Walid Nabgan4, Xun Hu1   

  1. 1. School of Material Science and Engineering, University of Jinan, Jinan 250022, China;
    2. Joint International Research Laboratory of Biomass Energy and Materials, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China;
    3. State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China;
    4. Departament d'Enginyeria Química, Universitat Rovira i Virgili, Tarragona 43007, Spain
  • 收稿日期:2023-03-26 修回日期:2023-07-07 出版日期:2024-04-28 发布日期:2024-06-28
  • 通讯作者: Xun Hu,Tel./Fax:+86 531 89736201.E-mail address:Xun.Hu@outlook.com
  • 基金资助:
    This work was supported by National Natural Science Foundation of China (51876080), the Program for Taishan Scholars of Shandong Province Government, the Agricultural Innovation Program of Shandong Province (SD2019NJ015) and the Research and Development program of Shandong Basan Graphite New Material Plant, National Natural Science Foundation of China (52076097), Key projects for inter-governmental cooperation in international science, technology and innovation (2018YFE0127500).

Steam reforming of acetic acid over Ni/biochar of low metal-loading: Involvement of biochar in tailoring reaction intermediates renders superior catalytic performance

Yunyu Guo1, Yiran Wang1, Shu Zhang2, Yi Wang3, Song Hu3, Jun Xiang3, Walid Nabgan4, Xun Hu1   

  1. 1. School of Material Science and Engineering, University of Jinan, Jinan 250022, China;
    2. Joint International Research Laboratory of Biomass Energy and Materials, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China;
    3. State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China;
    4. Departament d'Enginyeria Química, Universitat Rovira i Virgili, Tarragona 43007, Spain
  • Received:2023-03-26 Revised:2023-07-07 Online:2024-04-28 Published:2024-06-28
  • Contact: Xun Hu,Tel./Fax:+86 531 89736201.E-mail address:Xun.Hu@outlook.com
  • Supported by:
    This work was supported by National Natural Science Foundation of China (51876080), the Program for Taishan Scholars of Shandong Province Government, the Agricultural Innovation Program of Shandong Province (SD2019NJ015) and the Research and Development program of Shandong Basan Graphite New Material Plant, National Natural Science Foundation of China (52076097), Key projects for inter-governmental cooperation in international science, technology and innovation (2018YFE0127500).

摘要: Biochar is a reactive carrier as it may be partially gasified with steam in steam reforming, which could influence the formation of reaction intermediates and modify catalytic behaviors. Herein, the Ni/biochar as well as two comparative catalysts, Ni/Al2O3 and Ni/SiO2, with low nickel loading (2% (mass)) was conducted to probe involvement of the varied carriers in the steam reforming. The results indicated that the Ni/biochar performed excellent catalytic activity than Ni/SiO2 and Ni/Al2O3, as the biochar carrier facilitated quick conversion of the -OH from dissociation of steam to gasify the oxygen-rich carbonaceous intermediates like C=O and C-O-C, resulting in low coverage while high exposure of nickel species for maintaining the superior catalytic performance. In converse, strong adsorption of aliphatic intermediates over Ni/Al2O3 and Ni/SiO2 induced serious coking with polymeric coke as the main type (21.5% and 32.1%, respectively), which was significantly higher than that over Ni/biochar (3.9%). The coke over Ni/biochar was mainly aromatic or catalytic type with nanotube morphology and high crystallinity. The high resistivity of Ni/biochar towards coking was due to the balance between formation of coke and gasification of coke and partially biochar with steam, which created developed mesopores in spent Ni/biochar while the coke blocked pores in Ni/Al2O3 and Ni/SiO2 catalysts.

关键词: Steam reforming, Acetic acid, Ni/biochar catalyst, Property of coke, Reaction intermediates

Abstract: Biochar is a reactive carrier as it may be partially gasified with steam in steam reforming, which could influence the formation of reaction intermediates and modify catalytic behaviors. Herein, the Ni/biochar as well as two comparative catalysts, Ni/Al2O3 and Ni/SiO2, with low nickel loading (2% (mass)) was conducted to probe involvement of the varied carriers in the steam reforming. The results indicated that the Ni/biochar performed excellent catalytic activity than Ni/SiO2 and Ni/Al2O3, as the biochar carrier facilitated quick conversion of the -OH from dissociation of steam to gasify the oxygen-rich carbonaceous intermediates like C=O and C-O-C, resulting in low coverage while high exposure of nickel species for maintaining the superior catalytic performance. In converse, strong adsorption of aliphatic intermediates over Ni/Al2O3 and Ni/SiO2 induced serious coking with polymeric coke as the main type (21.5% and 32.1%, respectively), which was significantly higher than that over Ni/biochar (3.9%). The coke over Ni/biochar was mainly aromatic or catalytic type with nanotube morphology and high crystallinity. The high resistivity of Ni/biochar towards coking was due to the balance between formation of coke and gasification of coke and partially biochar with steam, which created developed mesopores in spent Ni/biochar while the coke blocked pores in Ni/Al2O3 and Ni/SiO2 catalysts.

Key words: Steam reforming, Acetic acid, Ni/biochar catalyst, Property of coke, Reaction intermediates