SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2022, Vol. 43 ›› Issue (3): 177-184.DOI: 10.1016/j.cjche.2022.01.015

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Highly efficient subnanometer Ru-based catalyst for ammonia synthesis via an associative mechanism

Yanliang Zhou, Qianjin Sai, Zhenni Tan, Congying Wang, Xiuyun Wang, Bingyu Lin, Jun Ni, Jianxin Lin, Lilong Jiang   

  1. National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou 350002, China
  • 收稿日期:2021-08-19 修回日期:2022-01-06 出版日期:2022-03-28 发布日期:2022-04-28
  • 通讯作者: Xiuyun Wang,E-mail:xywang2017@fzu.edu.cn;Lilong Jiang,E-mail:jll@fzu.edu.cn
  • 基金资助:
    The authors are grateful to the Key Research & Development Program of National Natural Science Foundation of China (22038002) and the National Natural Science Foundation of China (21972019, 22108037) for financial support of this work.

Highly efficient subnanometer Ru-based catalyst for ammonia synthesis via an associative mechanism

Yanliang Zhou, Qianjin Sai, Zhenni Tan, Congying Wang, Xiuyun Wang, Bingyu Lin, Jun Ni, Jianxin Lin, Lilong Jiang   

  1. National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou 350002, China
  • Received:2021-08-19 Revised:2022-01-06 Online:2022-03-28 Published:2022-04-28
  • Contact: Xiuyun Wang,E-mail:xywang2017@fzu.edu.cn;Lilong Jiang,E-mail:jll@fzu.edu.cn
  • Supported by:
    The authors are grateful to the Key Research & Development Program of National Natural Science Foundation of China (22038002) and the National Natural Science Foundation of China (21972019, 22108037) for financial support of this work.

摘要: The industrial manufacture of ammonia (NH3) using Fe-based catalyst works under rigorous conditions. For the goal of carbon-neutrality, it is highly desired to develop advanced catalyst for NH3 synthesis at mild conditions to reduce energy consumption and CO2 emissions. However, the main challenge of NH3 synthesis at mild conditions lies in the dissociation of steady NN triple bond. In this work, we report the design of subnanometer Ru clusters (0.8 nm) anchored on the hollow N-doped carbon spheres catalyst (Ru-SNCs), which effectively promotes the NH3 synthesis at mild conditions via an associative route. The NH3 synthesis rate over Ru-SNCs (0.49% (mass) Ru) reaches up to 11.7 mmol NH3·(g cat)-1·h-1 at 400 ℃ and 3 MPa, which is superior to that of 8.3 mmol NH3·(g cat)-1·h-1 over Ru nanoparticle catalyst (1.20% (mass) Ru). Various characterizations show that the N2H4 species are the main intermediates for NH3 synthesis on Ru-SNCs catalyst. It demonstrates that Ru-SNCs catalyst can follow an associative route for N2 activation, which circumvents the direct dissociation of N2 and results in highly efficient NH3 synthesis at mild conditions.

关键词: Ammonia synthesis, Sustainability, Subnanometer Ru clusters, Associative route, Catalysis

Abstract: The industrial manufacture of ammonia (NH3) using Fe-based catalyst works under rigorous conditions. For the goal of carbon-neutrality, it is highly desired to develop advanced catalyst for NH3 synthesis at mild conditions to reduce energy consumption and CO2 emissions. However, the main challenge of NH3 synthesis at mild conditions lies in the dissociation of steady NN triple bond. In this work, we report the design of subnanometer Ru clusters (0.8 nm) anchored on the hollow N-doped carbon spheres catalyst (Ru-SNCs), which effectively promotes the NH3 synthesis at mild conditions via an associative route. The NH3 synthesis rate over Ru-SNCs (0.49% (mass) Ru) reaches up to 11.7 mmol NH3·(g cat)-1·h-1 at 400 ℃ and 3 MPa, which is superior to that of 8.3 mmol NH3·(g cat)-1·h-1 over Ru nanoparticle catalyst (1.20% (mass) Ru). Various characterizations show that the N2H4 species are the main intermediates for NH3 synthesis on Ru-SNCs catalyst. It demonstrates that Ru-SNCs catalyst can follow an associative route for N2 activation, which circumvents the direct dissociation of N2 and results in highly efficient NH3 synthesis at mild conditions.

Key words: Ammonia synthesis, Sustainability, Subnanometer Ru clusters, Associative route, Catalysis