N2O is an important greenhouse gas with significant destructive effect on ozone layer. Direct catalytic decomposition is one of the most cost-effective ways to remove N2O. In recent years

plenty of researches on direct catalytic decomposition of N2O have been focusing on supported cobalt oxide catalysts due to their excellent low-temperature catalytic performance. An encapsulated cobalt-based core-shell material was first introduced into the N2O direct catalytic decomposition reaction. The dimension-limited core structure and mesoporous shell structure could effectively improve the metal dispersion

reduce particle size

and increase contact interface between active metal oxide and reactants

so that low temperature catalytic activity was significantly enhanced in N2O catalytic decomposition. Furthermore

a series of Co3O4@SiO2 spherical core-shell catalysts with different metal content were prepared to investigate the effect of encapsulation structure on catalytic performance. Characterizations on catalysts with techniques such as X-ray fluorescence spectroscopy (XRF)

high-resolution transmission electron microscopy (HR-TEM)

X-ray diffraction (XRD)

N2 adsorption-desorption and hydrogen temperature-programmed reduction (H2-TPR) indicated that catalysts with more active Co sites have better activity under premise of stable monodisperse core-shell structure.