Chinese Journal of Catalysis ›› 2025, Vol. 72: 301-313.DOI: 10.1016/S1872-2067(25)64657-2

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An experimental and computational investigation on structural evolution of the In2O3 catalyst during the induction period of CO2 hydrogenation

Zhangqian Weia,b,1, Mingxiu Wanga,b,1, Xinnan Lua,b,*(), Zixuan Zhoua,b, Ziqi Tanga,c, Chunran Change, Yong Yangc, Shenggang Lia,b,c,d,*(), Peng Gaoa,b,d,*()   

  1. aCenter for Low-Carbon Conversion Science and Engineering, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
    bUniversity of the Chinese Academy of Sciences, Beijing 100049, China
    cSchool of Physical Science and Technology, Shanghai Tech University, Shanghai 201210, China
    dState Key Laboratory of Low Carbon Catalysis and Carbon Dioxide Utilization, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
    eShaanxi Key Laboratory of Energy Chemical Process Intensification, School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, China
  • Received:2024-11-15 Accepted:2025-03-05 Online:2025-05-18 Published:2025-05-20
  • Contact: *E-mail: luxn@sari.ac.cn (X. Lu), lisg@sari.ac.cn (S. Li), gaopeng@sari.ac.cn (P. Gao).
  • About author:1Contributed to this work equally.
  • Supported by:
    National Key R&D Program of China(2024YFB4006600)

Abstract:

As one of the most important industrially viable methods for carbon dioxide (CO2) utilization, methanol synthesis serves as a platform for production of green fuels and commodity chemicals. For sustainable methanol synthesis, In2O3 is an ideal catalyst and has garnered significant attention. Herein, cubic In2O3 nanoparticles were prepared via the precipitation method and evaluated for CO2 hydrogenation to produce methanol. During the initial 10 h of reaction, CO2 conversion gradually increased, accompanied by a slow decrease of methanol selectivity, and the reaction reached equilibrium after 10-20 h on stream. This activation and induction stage may be attributed to the sintering of In2O3 nanoparticles and the creation of more oxygen vacancies on In2O3 surfaces. Further experimental studies demonstrate that hydrogen induction created additional oxygen vacancies during the catalyst activation stage, enhancing the performance of In2O3 catalyst for CO2 hydrogenation. Density functional theory calculations and microkinetic simulations further demonstrated that surfaces with higher oxygen vacancy coverages or hydroxylated surfaces formed during this induction period can enhance the reaction rate and increase the CO2 conversion. However, they predominantly promote the formation of CO instead of methanol, leading to reduced methanol selectivity. These predictions align well with the above-mentioned experimental observations. Our work thus provides an in-depth analysis of the induction stage of the CO2 hydrogenation process on In2O3 nano-catalyst, and offers valuable insights for significantly improving the CO2 reactivity of In2O3-based catalysts while maintaining long-term stability.

Key words: In2O3, CO2 hydrogenation, Methanol production, Induction and activation, Structural evolution