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<p>Toluene, a representative volatile organic compound (VOC) with a stable aromatic structure and high toxicity, poses significant challenges in air pollution control. This study developed a series of Ni-doped LaMn<sub>1−x</sub>Ni<sub>x</sub>O<sub>3</sub> (x = 0, 0.2, 0.4, 0.5, 0.6, 0.8, 1) perovskite catalysts via the sol–gel method to systematically investigate the Ni doping effects on toluene oxidation. Characterization results revealed that Ni doping refined crystallite size, increased specific surface area, and optimized surface oxygen species distribution. X-ray Photoelectron Spectroscopy (XPS) analysis demonstrated balanced Mn<sup>4+</sup>/Mn<sup>3+</sup> and Ni<sup>3+</sup>/Ni<sup>2+</sup> redox pairs at optimal doping (x = 0.4). XPS analyses confirmed enhanced lattice oxygen mobility and surface oxygen activity in the optimized catalyst. LaMn<sub>0.6</sub>Ni<sub>0.4</sub>O<sub>3</sub> exhibited the best catalytic activity for oxidation of toluene, achieving T<sub>50</sub> and T<sub>90</sub> values (temperatures required for 50% and 90% toluene conversion, respectively) of 221&#xa0;°C and 261&#xa0;°C respectively. These temperatures represent significant reductions of 26&#xa0;°C and 44&#xa0;°C compared to undoped LaMnO<sub>3</sub>. The catalyst maintained over 93% toluene conversion during 30&#xa0;h of continuous operation at 280&#xa0;°C. This work clarifies the structure–activity relationships between Ni doping concentration, redox properties, and oxygen activation, providing a design strategy for efficient non-noble metal VOC purification catalysts.</p>

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Enhanced catalytic oxidation of toluene over Ni-doped LaMn1−xNixO3 perovskite: correlation between structure and activity

  • 期刊论文

  • 发表日期：

    2026年7月27日

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  • Xin Cui,
  • Zhiyu Zhou,
  • Xiaoliang Shi,
  • Jia Lian,
  • Yajie Pang,
  • Yizhan Wang,
  • Zhenxiang Sun,
  • Rui Yang

摘要

Toluene, a representative volatile organic compound (VOC) with a stable aromatic structure and high toxicity, poses significant challenges in air pollution control. This study developed a series of Ni-doped LaMn1−xNixO3 (x = 0, 0.2, 0.4, 0.5, 0.6, 0.8, 1) perovskite catalysts via the sol–gel method to systematically investigate the Ni doping effects on toluene oxidation. Characterization results revealed that Ni doping refined crystallite size, increased specific surface area, and optimized surface oxygen species distribution. X-ray Photoelectron Spectroscopy (XPS) analysis demonstrated balanced Mn4+/Mn3+ and Ni3+/Ni2+ redox pairs at optimal doping (x = 0.4). XPS analyses confirmed enhanced lattice oxygen mobility and surface oxygen activity in the optimized catalyst. LaMn0.6Ni0.4O3 exhibited the best catalytic activity for oxidation of toluene, achieving T50 and T90 values (temperatures required for 50% and 90% toluene conversion, respectively) of 221 °C and 261 °C respectively. These temperatures represent significant reductions of 26 °C and 44 °C compared to undoped LaMnO3. The catalyst maintained over 93% toluene conversion during 30 h of continuous operation at 280 °C. This work clarifies the structure–activity relationships between Ni doping concentration, redox properties, and oxygen activation, providing a design strategy for efficient non-noble metal VOC purification catalysts.