Abstract The TiO2 support materials were synthesized by a chemical vapor condensation (CVC) method and the subsequent MnOx/TiO2 catalysts were prepared by an impregnation method in our previous studies. Catalytic oxidation of formaldehyde on the MnOx/TiO2 catalysts was examined with ozone. Formaldehyde (HCHO) is a specific volatile organic compound (VOC) found in indoor air of both residential places and workshops and must be removed to improve air quality. Catalytic oxidative decomposition of HCHO at room temperature (25 °C) is considered one of the most promising strategies for this. In this study, MnOx/TiO2 was prepared using chemical vapor condensation (CVC) as a HCHO ozone (O3) catalyst that operates at 25 °C. In this catalytic oxidation experiment, the HCHO of the gas stream on the MnOx/CVC-TiO2 catalyst was completely oxidized to CO2 with the addition of O3. The removal efficiency of HCHO increased from 35.3% to 100% as the O3:HCHO ratio increased from 1 to 5. COX selectivity also increased significantly with the increasing O3:HCHO ratio. As the relative humidity (RH) increased, HCHO removal efficiency and mineralization to CO2 increased. The HCHO removal efficiency increased to 100% at RH = 50%, whereas it was 85% at RH = 10%. The mineralization to CO2 increased to 100% at RH = 80%, and was 15% at RH = 10%.

中文翻译：

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在室温 (25 °C) 下，在 MnOx/TiO 2 催化剂上用臭氧氧化气态甲醛

摘要 在我们之前的研究中，TiO2 载体材料是通过化学气相冷凝 (CVC) 法合成的，随后的 MnOx/TiO2 催化剂是通过浸渍法制备的。用臭氧检测甲醛在 MnOx/TiO2 催化剂上的催化氧化。甲醛 (HCHO) 是一种特殊的挥发性有机化合物 (VOC)，存在于住宅和车间的室内空气中，必须去除以改善空气质量。HCHO 在室温 (25 °C) 下的催化氧化分解被认为是最有希望的策略之一。在这项研究中，MnOx/TiO2 是使用化学蒸汽冷凝 (CVC) 作为 HCHO 臭氧 (O3) 催化剂制备的，在 25 °C 下运行。在这个催化氧化实验中，在加入 O3 的情况下，MnOx/CVC-TiO2 催化剂上的气流中的 HCHO 被完全氧化为 CO2。随着 O3:HCHO 比率从 1 增加到 5，HCHO 的去除效率从 35.3% 增加到 100%。COX 选择性也随着 O3:HCHO 比率的增加而显着增加。随着相对湿度 (RH) 的增加，HCHO 去除效率和 CO2 矿化增加。HCHO 去除效率在 RH = 50% 时提高到 100%，而在 RH = 10% 时为 85%。CO2 的矿化在 RH = 80% 时增加到 100%，在 RH = 10% 时增加到 15%。HCHO 去除效率和 CO2 矿化增加。HCHO 去除效率在 RH = 50% 时提高到 100%，而在 RH = 10% 时为 85%。CO2 的矿化在 RH = 80% 时增加到 100%，在 RH = 10% 时增加到 15%。HCHO 去除效率和 CO2 矿化增加。HCHO 去除效率在 RH = 50% 时提高到 100%，而在 RH = 10% 时为 85%。CO2 的矿化在 RH = 80% 时增加到 100%，在 RH = 10% 时增加到 15%。