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<p>Ground-level ozone (O<sub>3</sub>) is a major air pollutant, and catalytic decomposition represents a promising strategy for its removal. However, maintaining high catalytic efficiency under humid conditions remains a considerable challenge. In this study, we encapsulate ultrafine metal oxides (UMOs; e.g., Co<sub>3</sub>O<sub>4</sub>, NiO) within the nanopores of an Fe<sub>3</sub>O-cluster-based metal–organic framework, PCN-333(Fe), for catalytic O<sub>3</sub> decomposition. The optimized 30% Co<sub>3</sub>O<sub>4</sub>@PCN-333(Fe) catalyst achieves sustained 100% O<sub>3</sub> conversion for over 120 hours in a continuous airflow containing 40 ppm O<sub>3</sub> under high space velocity (1.75 × 10<sup>5 </sup>h<sup>-1</sup>) and a broad range of humidity (10-90% RH). Mechanistic investigations reveal that the exceptional performance originates from an interfacial hydrogen-atom transfer process between Co<sub>3</sub>O<sub>4</sub> and the Fe<sub>3</sub>O clusters of PCN-333(Fe), as confirmed by in situ diffuse reflectance infrared Fourier-transform spectroscopy (DRIFTS) and in situ Raman spectroscopy. This work proposes a general principle for designing humidity-immune catalytic interfaces between metal oxides and porous materials, thereby providing a practical foundation for sustainable control of pollutant emissions in complex environments.</p>

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Metal-organic framework-confined Co3O4 for humidity-immune ozone decomposition

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月23日

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  • Yuning Lou,
  • Yuejiang Han,
  • Tianshuo Li,
  • Zhi-Ming Zhang,
  • Zhengbo Han

摘要

Ground-level ozone (O3) is a major air pollutant, and catalytic decomposition represents a promising strategy for its removal. However, maintaining high catalytic efficiency under humid conditions remains a considerable challenge. In this study, we encapsulate ultrafine metal oxides (UMOs; e.g., Co3O4, NiO) within the nanopores of an Fe3O-cluster-based metal–organic framework, PCN-333(Fe), for catalytic O3 decomposition. The optimized 30% Co3O4@PCN-333(Fe) catalyst achieves sustained 100% O3 conversion for over 120 hours in a continuous airflow containing 40 ppm O3 under high space velocity (1.75 × 105 h-1) and a broad range of humidity (10-90% RH). Mechanistic investigations reveal that the exceptional performance originates from an interfacial hydrogen-atom transfer process between Co3O4 and the Fe3O clusters of PCN-333(Fe), as confirmed by in situ diffuse reflectance infrared Fourier-transform spectroscopy (DRIFTS) and in situ Raman spectroscopy. This work proposes a general principle for designing humidity-immune catalytic interfaces between metal oxides and porous materials, thereby providing a practical foundation for sustainable control of pollutant emissions in complex environments.