SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2021, Vol. 38 ›› Issue (10): 98-105.DOI: 10.1016/j.cjche.2020.08.040

• Catalysis, Kinetics and Reaction Engineering • 上一篇    下一篇

Engineering the efficient three-dimension hollow cubic carbon from vacuum residuum with enhanced mass transfer ability towards H2O2 production

Zhaohui Chen1, Yasi Mo1, Dong Lin1, Yongxiao Tuo1, Xiang Feng1, Yibin Liu1, Xiaobo Chen1, De Chen2, Chaohe Yang1   

  1. 1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, China;
    2. Department of Chemical Engineering, Norwegian University of Science and Technology, Trondheim 7491, Norway
  • 收稿日期:2020-06-29 修回日期:2020-08-14 出版日期:2021-10-28 发布日期:2021-12-02
  • 通讯作者: Xiang Feng, Chaohe Yang
  • 基金资助:
    This work was supported by the National Natural Science Foundation of China (21978325).

Engineering the efficient three-dimension hollow cubic carbon from vacuum residuum with enhanced mass transfer ability towards H2O2 production

Zhaohui Chen1, Yasi Mo1, Dong Lin1, Yongxiao Tuo1, Xiang Feng1, Yibin Liu1, Xiaobo Chen1, De Chen2, Chaohe Yang1   

  1. 1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, China;
    2. Department of Chemical Engineering, Norwegian University of Science and Technology, Trondheim 7491, Norway
  • Received:2020-06-29 Revised:2020-08-14 Online:2021-10-28 Published:2021-12-02
  • Contact: Xiang Feng, Chaohe Yang
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (21978325).

摘要: Constructing efficient carbon material with enhanced mass transfer ability from vacuum residuum (VR) is of prime industrial and scientific significance. Herein, we demonstrated a one-pot synthesis of metal-free and highly symmetric hollow carbon cubes (HCCs) using cost-efficient vacuum residuum (VR) as a C/N/S source. By multi-techniques such as TEM, SEM, Raman, XPS, and XRD, it is found that the CTAB surfactant plays an important role in emulsifying and forming oil-in-water suspension particles. Subsequently, high aromatics contents in VR favor the formation of HCCs shell by graphitization on the surface of NaCl template. Notably, heavy metals (e.g., V, Ni) are not enriched in carbon skeleton due to the unique graphitization mechanism. This metal-free HCCs catalyst showed good catalytic stability and high selectivity towards direct and local electrochemical production of hydrogen peroxide (H2O2) through two-electron O2 reduction due to enhanced mass transfer ability. The results provide a novel avenue to synthesize metal-free cubic carbon material from low-cost and plentiful VR, which are essential to the design of more efficient catalysts for O2 reduction to H2O2.

关键词: Electrochemistry, Hydrogen peroxide, Hollow carbon cube, Vacuum residuum, Catalyst, Selectivity

Abstract: Constructing efficient carbon material with enhanced mass transfer ability from vacuum residuum (VR) is of prime industrial and scientific significance. Herein, we demonstrated a one-pot synthesis of metal-free and highly symmetric hollow carbon cubes (HCCs) using cost-efficient vacuum residuum (VR) as a C/N/S source. By multi-techniques such as TEM, SEM, Raman, XPS, and XRD, it is found that the CTAB surfactant plays an important role in emulsifying and forming oil-in-water suspension particles. Subsequently, high aromatics contents in VR favor the formation of HCCs shell by graphitization on the surface of NaCl template. Notably, heavy metals (e.g., V, Ni) are not enriched in carbon skeleton due to the unique graphitization mechanism. This metal-free HCCs catalyst showed good catalytic stability and high selectivity towards direct and local electrochemical production of hydrogen peroxide (H2O2) through two-electron O2 reduction due to enhanced mass transfer ability. The results provide a novel avenue to synthesize metal-free cubic carbon material from low-cost and plentiful VR, which are essential to the design of more efficient catalysts for O2 reduction to H2O2.

Key words: Electrochemistry, Hydrogen peroxide, Hollow carbon cube, Vacuum residuum, Catalyst, Selectivity