ZHU Jie, SUN Yueyin, GU Mingyang, XU Lirui, HUANG Qiong, YANG Bo, ZHAO Yunxia, CHEN Mindong
Abstract (
)
Download PDF (
)
Knowledge map
Save
Formaldehyde (HCHO) is one of the main pollutants in indoor air, which seriously affects the quality of indoor air and endangers human health. Catalytic oxidation at room temperature is an effective method to remove HCHO, which can completely convert HCHO into CO2 and H2O at room temperature. However, noble metal catalysts are the main catalysts at present, which are expensive and not conducive to large-scale production and application. In this paper, TiO2 carrier is prepared by sol-gel method, and MnFeOx is supported by impregnation, evaporation, drying and roasting with manganese nitrate and ferric nitrate as active precursors. Meanwhile, the effects of metal oxide loading, molar ratio, roasting temperature and other factors on the catalytic oxidation performance of catalysts at room temperature are investigated. BET, SEM, XRD, H2-TPR, O2-TPD, in-situ DRIFTS and other techniques are used to characterize and analyze the catalysts. The experimental results show that when MnFeOx loading is 10 wt%, n(Mn)∶n(Fe)=4∶1 and calcination temperature is 350 ℃, the catalyst exhibits the best catalytic oxidation activity at room temperature, and the removal rate of formaldehyde reaches 87.6% within 48 h.