Stratospheric ozone (O₃), which slips into the cabin through the air-supply system in a commercial airliner, is detrimental to human health around the world. For gaseous O₃ abatement, catalytic decomposition is an effective method. However, catalyst deactivation is one of the main obstacles to its practical application. In this study, a new deactivation mechanism involving the surface hydroxyl group of catalyst is found by investigating the effects of heat treatment of cerium-modified todorokite-type manganese dioxides (Ce–MnO₂) on O₃ decomposition, which will contribute to the development of more active and stable O₃ decomposition catalysts in the future work. The in situ DRIFT study indicates that gaseous O₃ reacted with surface hydroxyl groups to form surface adsorbed water, which occupied the catalytically active sites (i.e., oxygen vacancies) leading to the catalyst deactivation. Calcination at 300 °C greatly removed surface hydroxyl groups while keeping oxygen vacancies almost unchanged at the same time; thus the as-obtained catalyst showed greatly improved stability, keeping ∼98% of removal efficiency for ∼115 ppm of O₃ within 5 h under a very high space velocity of 1200 L g^–1 h^–1 at room temperature.

中文翻译：

---

去除Ce修饰的MnO _2的表面羟基以显着提高其气态臭氧分解的稳定性

平流层臭氧（O ₃）通过一架商用客机的供气系统滑入机舱，对全世界的人类健康都是有害的。对于减少气态O ₃，催化分解是一种有效的方法。但是，催化剂失活是其实际应用的主要障碍之一。在这项研究中，通过研究铈改性的钙钛矿型二氧化锰（Ce–MnO ₂）的热处理对O ₃分解的影响，发现了一种新的涉及催化剂表面羟基的失活机理。更加活跃和稳定的O ₃分解催化剂在未来的工作中。原位DRIFT研究表明，气态O ₃与表面羟基反应形成表面吸附水，该水占据了催化活性位（即氧空位），导致催化剂失活。在300°C下煅烧可大大去除表面羟基，同时保持氧空位几乎不变。因此，所获得的催化剂显示出大大提高的稳定性，在室温下在1200 L g ^–1 h ^–1的极高空速下，在5 h内对约115 ppm O ₃的去除效率保持约98％。