Chinese Journal of Catalysis ›› 2024, Vol. 61: 164-178.DOI: 10.1016/S1872-2067(24)60026-4

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Photo-thermal cooperation for the conversion of CO2 and CH4 with H2O to C2 oxygenates over SrTiOx supported CuCo

Yanru Zhua,b, Zhijun Zhanga, Jian Zhanga,b,*(), Shuangjiang Jianga, Zhe Ana,b, Hongyan Songa, Xin Shua, Wei Xic, Lirong Zhengd, Jing Hea,b,*()   

  1. aState Key Laboratory of Chemical Resource Engineering, & Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
    bQuzhou Institute for Innovation in Resource Chemical Engineering, Quzhou 324000, Zhejiang, China
    cCenter for Electron Microscopy and Tianjin Key Laboratory of Advanced Functional Porous Materials, Tianjin University of Technology, Tianjin 300384, China
    dInstitute of High Energy Physics, the Chinese Academy of Sciences, Beijing 100049, China
  • Received:2024-02-18 Accepted:2024-03-28 Online:2024-06-18 Published:2024-06-20
  • Contact: * E-mail: jinghe@263.net.cn (J. He), zhangjian450924@buct.edu.cn (J. Zhang).
  • Supported by:
    National Key R&D Program of China(2021YFB3801602);National Natural Science Foundation of China(22288102)

Abstract:

Photosynthesis is a potential strategy to enable endergonic process that usually needs high-temperature in thermochemistry to supply the energy for inert-bond activation and/or strong endothermic reaction. The conversion of CO2 into value-added C2-oxygenates is a promising process to realize artificial photosynthesis, but suffers from relatively lower efficiency due to complex multi-electron (≥ 10) transfer processes and sluggish kinetics of C-C coupling. This work proposes an all-new H2O-promoted strategy for efficient production of C2 oxygenates from the concurrent activation and subsequent co-conversion of CO2 with CH4 under photo-thermal cooperation, in which photocatalytic H2O-splitting derived active hydrogen species for CO2 activation, and concomitant active oxygen species for CH4 activation. A formation rate of as high as 2.05 mmol g-1 h-1 for C2-oxygenates (CH3CHO and CH3CH2OH) in a selectivity of > 86% has been afforded over SrTiOx supported CuCo under 200 °C and ultraviolet-visible illumination. It has been revealed that SrTiOx drives photocatalytic H2O-splitting under the excitation primary from ultraviolet light, paired CuI/Cu0 sites promote the formation of *CHxO intermediate from CO2, Co sites conduct CH4-to-*CH3, and C-C coupling of *CHxO and *CH3 on adjacent Cu-Co facilitates the generation of C2-oxygenates.

Key words: Photo-thermal cooperation, Co-conversion of CO2 and CH4, SrTiOx supported Cu-Co, Water-splitting, C2-oxygenates