SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2021, Vol. 34 ›› Issue (6): 258-266.DOI: 10.1016/j.cjche.2020.07.050

• Resources and Environmental Technology • 上一篇    下一篇

Continuous generation of lattice oxygen via redox engineering for boosting toluene degradation performances

Shiya He1, Zhimin You1, Xin Jin2, Yi Wu1, Cheng Chen1, He Zhao3, Jian Shen1   

  1. 1 Department of Environment and Resources, Xiangtan University, Xiangtan 411105, China;
    2 State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering, China University of Petroleum, Qingdao 266580, China;
    3 Beijing Engineering Research Center of Process Pollution Control, Division of Environment Technology and Engineering, Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
  • 收稿日期:2020-04-22 修回日期:2020-07-20 出版日期:2021-06-28 发布日期:2021-08-30
  • 通讯作者: Jian Shen
  • 基金资助:
    This work is Supported by the National Natural Science Foundation of China (21707023), Provincial Key Research and Development Plan of Hunan Province (2018SK2034), and New Faculty Start-Up Funding from Xiangtan University (18QDZ16).

Continuous generation of lattice oxygen via redox engineering for boosting toluene degradation performances

Shiya He1, Zhimin You1, Xin Jin2, Yi Wu1, Cheng Chen1, He Zhao3, Jian Shen1   

  1. 1 Department of Environment and Resources, Xiangtan University, Xiangtan 411105, China;
    2 State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering, China University of Petroleum, Qingdao 266580, China;
    3 Beijing Engineering Research Center of Process Pollution Control, Division of Environment Technology and Engineering, Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2020-04-22 Revised:2020-07-20 Online:2021-06-28 Published:2021-08-30
  • Contact: Jian Shen
  • Supported by:
    This work is Supported by the National Natural Science Foundation of China (21707023), Provincial Key Research and Development Plan of Hunan Province (2018SK2034), and New Faculty Start-Up Funding from Xiangtan University (18QDZ16).

摘要: Excellent performances promoted by lattice oxygen have attracted wide attention for catalytic degradation of volatile organic compounds (VOCs). However, how to control the continuous regeneration of lattice oxygen from the support is seldom reported. In this study, we selected sepiolite supported manganese-cobalt oxides (CoxMn100-xOy) as model catalysts by tuning Co/(Co + Mn) mass ratio (x = 3%, 10%, 15%, and 20%) to enhance toluene degradation efficiency, owing to lattice oxygen regeneration by redox cycle existing at the interface and Mn species with high valence state, initiated by cobalt catalytic performance under the role of crystal field stability phase. The results of activity test show that the sepiolite-Co15Mn85Oy catalyst exhibit outperformances at 193 ℃ with 10,000 h-1 GHSV. In addition, the catalyst existed at the bottom of the “volcano” curve correlated T50 or T90 with Co/(Co + Mn) weight ratio is sepiolite-Co15Mn85Oy, conforming its outperformance. Further characterized by investigating active sites structural and electronic properties, the essential of superior catalytic activity is attributed to the grands of lattice oxygen continuous formation resulted from redox engineering based on the high atomic ratio of surface lattice oxygen with continuous refilled from the support and that of Mn4+/Mn3+ cycle initiated by cobalt catalytic behaviors. All in all, redox engineering, not only promotes grands of active species reversible regeneration, but supplies an alternative catalyst design strategy towards the terrific efficiency-to-cost ratio performance.

关键词: Redox engineering, Crystal field stability phase, Lattice oxygen, Toluene degradation

Abstract: Excellent performances promoted by lattice oxygen have attracted wide attention for catalytic degradation of volatile organic compounds (VOCs). However, how to control the continuous regeneration of lattice oxygen from the support is seldom reported. In this study, we selected sepiolite supported manganese-cobalt oxides (CoxMn100-xOy) as model catalysts by tuning Co/(Co + Mn) mass ratio (x = 3%, 10%, 15%, and 20%) to enhance toluene degradation efficiency, owing to lattice oxygen regeneration by redox cycle existing at the interface and Mn species with high valence state, initiated by cobalt catalytic performance under the role of crystal field stability phase. The results of activity test show that the sepiolite-Co15Mn85Oy catalyst exhibit outperformances at 193 ℃ with 10,000 h-1 GHSV. In addition, the catalyst existed at the bottom of the “volcano” curve correlated T50 or T90 with Co/(Co + Mn) weight ratio is sepiolite-Co15Mn85Oy, conforming its outperformance. Further characterized by investigating active sites structural and electronic properties, the essential of superior catalytic activity is attributed to the grands of lattice oxygen continuous formation resulted from redox engineering based on the high atomic ratio of surface lattice oxygen with continuous refilled from the support and that of Mn4+/Mn3+ cycle initiated by cobalt catalytic behaviors. All in all, redox engineering, not only promotes grands of active species reversible regeneration, but supplies an alternative catalyst design strategy towards the terrific efficiency-to-cost ratio performance.

Key words: Redox engineering, Crystal field stability phase, Lattice oxygen, Toluene degradation