Based on the above literature, there are two factors leading to the unsatisfactory removal ability of conventional catalysts in practical application environments: poor low-temperature activity and weak water resistance. Conventional catalysts are unable to activate oxygen molecules at low temperatures, leading to the high energy barrier of catalytic oxidation for formaldehyde and poor low-temperature activity. On the other hand, the poor selectivity of conventional catalysts results in the active sites of catalysts being occupied by water molecules preferentially. Therefore, the catalyst with high catalytic activity and high adsorption selectivity urgently needs to be developed.