MnOx–CeO2 Derived from Mn–Ce-MOFs with Highly Efficient Removal of Formaldehyde

A series of MnOx–CeO2 with different molar ratios of Mn/Ce had been synthesized via in-situ pyrolysis of Mn–Ce-MOFs precursor. The as-prepared catalysts were applied for catalytic oxidation of formaldehyde (HCHO) and also characterized by N2 adsorption–desorption, XRD, SEM, H2-TPR, O2-TPD and XPS. The result of catalytic test indicated that MnOx–CeO2 with a Mn/Ce molar ratio of 5:5 exhibited outstanding catalytic performance, which could achieve complete oxidation of HCHO at a temperature as low as 40 °C. Moreover, MnOx–CeO2 (5:5) possessed good stability and resistance to moisture. The HCHO conversion still retained over 99.0% as adding 5% H2O to the gas feed. The studies revealed that the close contact between Mn and Ce species in the Mn–Ce-MOFs precursor enhanced the interaction between MnOx and CeO2 through the calcination. The high specific surface area, easy low-temprature reducibility, abundant surface active oxygen and rich Mn4+ species were contributed to the excellent catalytic activity of MnOx–CeO2. Therefore, the MnOx–CeO2 catalyst possessed promising application prospect in removing HCHO at ambient temperature.