Core-Shell-Like Structured Co3O4@SiO2 Catalyst for Highly Efficient Catalytic Elimination of Ozone

Abstract

Co 3 O 4 is an environmental catalyst that can effectively decompose ozone, but is strongly affected by water vapor. In this study, Co 3 O 4 @SiO 2 catalysts with a core-shell-like structure were synthesized following the hydrothermal method. At 60% relative humidity and a space velocity of 720,000 h −1 , the prepared Co 3 O 4 @SiO 2 obtained 95% ozone decomposition for 40 ppm ozone after 6 h, which far outperformed that of the 25wt% Co 3 O 4 /SiO 2 catalysts. The superiority of Co 3 O 4 @SiO 2 is ascribed to its core@shell structure, in which Co 3 O 4 is wrapped inside the SiO 2 shell structure to avoid air exposure. This research provides important guidance for the high humidity resistance of catalysts for ozone decomposition.