Chinese Journal of Catalysis ›› 2023, Vol. 52: 217-227.DOI: 10.1016/S1872-2067(23)64494-8

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Role of oxygen transfer and surface reaction in catalytic performance of VOx-Ce1‒xZrxO2 for propane dehydrogenation

Jiachen Suna,b, Sai Chena,b,c, Donglong Fua,b, Wei Wanga,b,c, Xianhui Wanga,b, Guodong Suna,b, Chunlei Peia,b,*(), Zhi-Jian Zhaoa,b,*(), Jinlong Gonga,b,c,d,e   

  1. aKey Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072, China
    bCollaborative Innovation Center for Chemical Science & Engineering (Tianjin), Tianjin 300072, China
    cJoint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Binhai New City, Fuzhou 350207, Fujian, China
    dHaihe Laboratory of Sustainable Chemical Transformations, Tianjin 300192, China
    eNational Industry-Education Platform of Energy Storage, Tianjin University, Tianjin 300350, China
  • Received:2023-05-30 Accepted:2023-07-19 Online:2023-09-18 Published:2023-09-25
  • Contact: *E-mail: chunlei.pei@tju.edu.cn (C. Pei),zjzhao@tju.edu.cn (Z. Zhao).
  • Supported by:
    National Key R&D Program of China(2021YFA1501302);National Natural Science Foundation of China(22121004);National Natural Science Foundation of China(22122808);Haihe Laboratory of Sustainable Chemical Transformations(CYZC202107);Introducing Talents of Discipline to Universities(BP0618007);XPLORER PRIZE

Abstract:

The bulk oxygen transfer and surface reaction as important parts of the chemical looping-related process are crucial for the rational design of new redox catalysts. This paper describes an experimental study on the effect of bulk oxygen transfer and surface reaction in Ce1‒xZrxO2 supported VOx redox catalysts for the chemical looping oxidative propane dehydrogenation reaction. It was found that the introduction of Zr dictates the reaction performance of the redox catalyst by modulating the bulk oxygen transfer and surface reaction. The kinetic study reveals that the instantaneous reduction rate of the redox catalysts is determined by the H-abstraction step in the surface reaction. The introduction of Zr can reduce the activation energy of the H-abstraction step, which leads to the enhancement of the instantaneous reduction rate. Meanwhile, the oxygen supply capacity of the cerium oxide is increased by Zr, allowing the surface reaction to proceed over longer durations. Furthermore, the reaction model derived from the kinetics study is validated using a number of (quasi) in situ techniques. This study provides fundamental insights into the role of bulk oxygen transfer and surface reaction in chemical looping or related process.

Key words: Propane dehydrogenation, Vanadia catalyst, Redox chemistry, Surface reaction, Bulk diffusion