SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2023, Vol. 53 ›› Issue (1): 409-420.DOI: 10.1016/j.cjche.2022.10.006

• Full Length Article • 上一篇    下一篇

Chemical looping oxidative propane dehydrogenation controlled by oxygen bulk diffusion over FeVO4 oxygen carrier pellets

Hongbo Song1,2, Wei Wang1,2,5,6, Jiachen Sun1,2, Xianhui Wang1,2, Xianhua Zhang1,2, Sai Chen1,2, Chunlei Pei1,2,3,4, Zhi-Jian Zhao1,2,3,4   

  1. 1. Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
    2. Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China;
    3. Haihe Laboratory of Sustainable Chemical Transformations, Tianjin 300192, China;
    4. Zhejiang Institute of Tianjin University, Ningbo, 315201, China;
    5. Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Binhai New City, Fuzhou 350207, China;
    6. Department of Chemistry, National University of Singapore, 3 Science Drive 3 117543, Singapore
  • 收稿日期:2022-09-23 修回日期:2022-10-13 出版日期:2023-01-28 发布日期:2023-04-08
  • 通讯作者: Chunlei Pei,E-mail:chunlei.pei@tju.edu.cn;Zhi-Jian Zhao,E-mail:zjzhao@tju.edu.cn
  • 基金资助:
    We acknowledge the National Key Research and Development Program of China (2021YFA1501302), the National Natural Science Foundation of China (22122808, U20B6002), the Haihe Laboratory of Sustainable Chemical Transformations and the Program of Introducing Talents of Discipline to Universities (BP0618007) for financial support. This work is supported by the XPLORER PRIZE by Tencent Foundation.

Chemical looping oxidative propane dehydrogenation controlled by oxygen bulk diffusion over FeVO4 oxygen carrier pellets

Hongbo Song1,2, Wei Wang1,2,5,6, Jiachen Sun1,2, Xianhui Wang1,2, Xianhua Zhang1,2, Sai Chen1,2, Chunlei Pei1,2,3,4, Zhi-Jian Zhao1,2,3,4   

  1. 1. Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
    2. Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China;
    3. Haihe Laboratory of Sustainable Chemical Transformations, Tianjin 300192, China;
    4. Zhejiang Institute of Tianjin University, Ningbo, 315201, China;
    5. Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Binhai New City, Fuzhou 350207, China;
    6. Department of Chemistry, National University of Singapore, 3 Science Drive 3 117543, Singapore
  • Received:2022-09-23 Revised:2022-10-13 Online:2023-01-28 Published:2023-04-08
  • Contact: Chunlei Pei,E-mail:chunlei.pei@tju.edu.cn;Zhi-Jian Zhao,E-mail:zjzhao@tju.edu.cn
  • Supported by:
    We acknowledge the National Key Research and Development Program of China (2021YFA1501302), the National Natural Science Foundation of China (22122808, U20B6002), the Haihe Laboratory of Sustainable Chemical Transformations and the Program of Introducing Talents of Discipline to Universities (BP0618007) for financial support. This work is supported by the XPLORER PRIZE by Tencent Foundation.

摘要: The oxygen distribution and evolution within the oxygen carrier exert significant influence on chemical looping processes. This paper describes the influence of oxygen bulk diffusion within FeVO4 oxygen carrier pellets on the chemical looping oxidative propane dehydrogenation (CL-ODH). During CL-ODH, the oxygen concentration at the pellet surface initially decreased and then maintained stable before the final decrease. At the stage with the stable surface oxygen concentration, the reaction showed a stable C3H6 formation rate and high C3H6 selectivity. Therefore, based on Fick’s second law, the oxygen distribution and evolution in the oxygen carrier at this stage were further analyzed. It was found that main reactions of selective oxidation and over-oxidation were controlled by the oxygen bulk diffusion. C3H8 conversion rate kept decreasing during this stage due to the decrease of the oxygen flux caused by the decline of oxygen gradient within the oxygen carrier, while C3H6 selectivity increased due to the decrease of over-oxidation. In addition, reaction rates could increase with the propane partial pressure due to the increase of the oxygen gradient within the oxygen carrier until the bulk transfer reached its limit at higher propane partial pressure. This study provides fundamental insights for the diffusion-controlled chemical looping reactions.

关键词: Chemical looping, Diffusion, Reaction kinetics, Oxygen carriers, Oxidation

Abstract: The oxygen distribution and evolution within the oxygen carrier exert significant influence on chemical looping processes. This paper describes the influence of oxygen bulk diffusion within FeVO4 oxygen carrier pellets on the chemical looping oxidative propane dehydrogenation (CL-ODH). During CL-ODH, the oxygen concentration at the pellet surface initially decreased and then maintained stable before the final decrease. At the stage with the stable surface oxygen concentration, the reaction showed a stable C3H6 formation rate and high C3H6 selectivity. Therefore, based on Fick’s second law, the oxygen distribution and evolution in the oxygen carrier at this stage were further analyzed. It was found that main reactions of selective oxidation and over-oxidation were controlled by the oxygen bulk diffusion. C3H8 conversion rate kept decreasing during this stage due to the decrease of the oxygen flux caused by the decline of oxygen gradient within the oxygen carrier, while C3H6 selectivity increased due to the decrease of over-oxidation. In addition, reaction rates could increase with the propane partial pressure due to the increase of the oxygen gradient within the oxygen carrier until the bulk transfer reached its limit at higher propane partial pressure. This study provides fundamental insights for the diffusion-controlled chemical looping reactions.

Key words: Chemical looping, Diffusion, Reaction kinetics, Oxygen carriers, Oxidation