Recent Advances in Formaldehyde Catalytic Oxidation Catalysts

Formaldehyde (HCHO), a colorless gas, is currently a toxic gas that seriously endangers human health and the environment. To effectively remove formaldehyde, catalytic oxidation is considered to be the most promising, widely studied, and applied method. This method utilizes a catalyst to promote the reaction of HCHO with O2, converting it into harmless CO2 and H2O. In recent years, researchers have developed various catalysts, including noble metal catalysts (such as Pt, Pd) and transition-metal catalysts (such as Co3O4, MnO2), to improve the efficiency of formaldehyde oxidation. In experimental studies, by optimizing the composition, structure, and reaction conditions of the catalyst, the conversion rate and selectivity of formaldehyde can be significantly increased. This article reviews the current research status of noble metal catalysts and transition metal catalysts in the field of formaldehyde catalytic oxidation, discusses the main factors affecting the efficiency of formaldehyde catalytic oxidation in experimental studies, and finally explores the overall reaction mechanism of formaldehyde catalytic oxidation. In summary, formaldehyde catalytic oxidation technology has broad application prospects in indoor air purification, industrial waste gas treatment, etc.