The complete oxidation of HCHO in air with O3 over MnOx catalysts at room temperature was studied. The MnOx catalysts were prepared by a redox method. The catalysts showed amorphous patterns in X-ray diffraction characterization. Formaldehyde in simulated air containing 137 mg/m3 HCHO with 56% relative humidity (RH, 25 °C) was totally oxidized to CO2 by 642 mg/m3 O3 over the MnOx catalysts at GHSV (gas hourly space velocity) = 2 × 105 h−1. The formaldehyde conversion and CO2 selectivity were maintained at ∼ 100% during 150 min time-on-stream. The effect of the molar ratio of O3 to HCHO was also investigated. At a O3 to HCHO molar ratio of 2:3, which was significantly lower than the stoichiometric ratio, a CO2 selectivity of 100% was still achieved. No byproduct was detected during HCHO oxidation with O3 over the MnOx catalysts using an online Fourier transform infrared spectrometer. 采用氧化还原法制备了 MnOx 催化剂, X射线衍射结果表明其主要为无定形结构. 在甲醛和臭氧浓度分别为 137 和 642 mg/m3, 相对湿度为 56% (25 oC), GHSV 为 2 × 105 h条件下, MnOx 催化剂上 O3 可将甲醛全部氧化为 CO2, 反应 150 min 内甲醛转化率和 CO2 选择性一直保持在–100%. 另外, 当臭氧与甲醛的摩尔比约为 2:3, 即显著低于化学计量比时, CO2 选择性仍可达–100%. 采用傅里叶变换红外光谱仪在线分析了甲醛氧化反应产物, 未检测到任何副产物, 从而确认了 MnOx 催化剂上 O3 对甲醛的完全氧化.