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<p>In this study, a series of layered <i>δ</i>-MnO<sub>2</sub> catalysts were synthesized via a novel, rapid, and facile self-combustion technique (SCT), which enables autonomous catalytic activity without requiring external energy input. Among the prepared catalysts, the MnO<sub>2</sub>-C sample, synthesized using citric acid as fuel, exhibited superior catalytic performance for toluene oxidation, achieving 50% (<i>T</i><sub>50</sub> = 237&#xa0;°C) and 90% (<i>T</i><sub>90</sub> = 252&#xa0;°C) conversion of 1000&#xa0;ppm toluene at notably low temperatures. Extensive characterization revealed that the exceptional catalytic activity of MnO<sub>2</sub>-C stems from its large specific surface area, outstanding low-temperature reducibility, abundant lattice oxygen and oxygen vacancies, and efficient oxygen species cycling. These properties collectively facilitate the low-temperature oxidation of toluene. This work not only advances the development of high-performance non-precious metal catalysts for volatile organic compound (VOC) abatement but also demonstrates significant potential for industrial-scale applications.</p>

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Green and fast synthesis of layered δ-MnO2 catalysts for the catalytic oxidation of toluene by self-driven combustion technology (SCT)

  • 期刊论文

  • 发表日期：

    2025年8月16日

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  • Jiazuo Li,
  • Xuxu Zhai,
  • Xiaojie Gu,
  • Xiaomin Ren

摘要

In this study, a series of layered δ-MnO2 catalysts were synthesized via a novel, rapid, and facile self-combustion technique (SCT), which enables autonomous catalytic activity without requiring external energy input. Among the prepared catalysts, the MnO2-C sample, synthesized using citric acid as fuel, exhibited superior catalytic performance for toluene oxidation, achieving 50% (T50 = 237 °C) and 90% (T90 = 252 °C) conversion of 1000 ppm toluene at notably low temperatures. Extensive characterization revealed that the exceptional catalytic activity of MnO2-C stems from its large specific surface area, outstanding low-temperature reducibility, abundant lattice oxygen and oxygen vacancies, and efficient oxygen species cycling. These properties collectively facilitate the low-temperature oxidation of toluene. This work not only advances the development of high-performance non-precious metal catalysts for volatile organic compound (VOC) abatement but also demonstrates significant potential for industrial-scale applications.