Integrating Lewis Acid Sites and Pd Active Species to Improve Catalytic Oxidation of Formaldehyde over CeO 1-y Cl/Pd Catalyst at Room Temperature

Formaldehyde (HCHO), as a typical organic pollutant, seriously threatens human health. Room-temperature catalytic oxidation can effectively convert HCHO into CO 2 and H 2 O, however, it still faces the problem of low catalytic efficiency. In this study, the CeO 1-y Cl/Pd catalysts were constructed to propose a synergistic HCHO capture-mineralization strategy based on the interaction between oxygen vacancies and Pd active sites. The surface oxygen vacancies of CeO 1-y Cl enable efficient HCHO adsorption through strong interactions with the carbonyl oxygen of HCHO, and meanwhile the Pd active sites activate O 2 to generate superoxide radicals (°O 2- ) driving the deep oxidation of adsorbed HCHO. The substitution of lattice oxygen of CeO 2 by chloride ions not only stabilizes oxygen vacancies but also significantly enhances the dispersion of Pd active sites. The experimental results indicate that the typical sample (CeO 1-y Cl/Pd-6) exhibit the excellent catalytic oxidation efficiency for HCHO, with remove rate of 79.1 %. This study provides a feasible solution to design efficient catalysts for purification of HCHO pollution.