MnO₂ catalysts have been widely studied for catalytic gaseous ozone decomposition. However, their poor moisture resistance often leads to undesirable catalytic effects in the presence of high humidity. In this study, a novel catalyst with γ-like MnO₂ was synthesized using the selective dissolution method on LaMnO₃ perovskites. The as-prepared catalyst exhibited quite stable ozone conversion of ~90% within 12 h under 75% relative humidity (400–800 ppm of ozone, 30 °C, 150 000 mL·g⁻¹·h⁻¹ of WHSV). In contrast, traditional γ-MnO₂ catalyst showed deficient resistance to H₂O and sensitivity to space velocity. Detailed characterizations showed that the larger number of oxygen vacancies induced by structure reconstruction of the γ-like MnO₂ and residual La³⁺ cations facilitated ozone decomposition in humid atmosphere. Finally, the reaction rate of ozone decomposition was proposed by a kinetic study, which further proved that the amount and hydrophilicity of oxygen vacancies are the determinants of the first-order reaction rate constant.

MnO ₂催化剂已被广泛研究用于催化气态臭氧分解。然而，它们较差的耐湿性通常会在高湿度存在下导致不良的催化效果。在这项研究中，使用选择性溶解法在 LaMnO ₃钙钛矿上合成了一种具有 γ 类 MnO ₂的新型催化剂。所制备的催化剂在 75% 的相对湿度（400-800 ppm 臭氧，30 °C，150 000 mL·g ^-1 ·h ^-1 WHSV）下在 12小时内表现出相当稳定的臭氧转化率~90% 。相比之下，传统的γ-MnO ₂催化剂对H _{2 的}耐受性较差  O 和对空间速度的敏感性。详细的表征表明，由类 γ MnO ₂和残留的 La ³⁺阳离子的结构重建引起的大量氧空位促进了潮湿大气中的臭氧分解。最后，通过动力学研究提出了臭氧分解的反应速率，进一步证明了氧空位的数量和亲水性是一级反应速率常数的决定因素。