Cooking-Like Regeneration Prolonging the Catalytic Lifetime for Ambient Removal of Indoor HCHO
Chunqi Wang, Jin Chen, Wenjian Xu, Xiaolan Li, Hongpeng Jia
Abstract
According to practical demands, a new approach depending on widespread household equipment was recommended to prolong the efficiency of the Mn-based catalyst in room-temperature removal of indoor HCHO. Among various manganese oxides, δ-MnO2 was screened out as the optimal catalyst, owing to its abundant surficial lattice oxygen and proper redox nature. However, δ-MnO2 still suffered from the poisoning effect of intermediates during HCHO’s partial oxidation at room temperature. According to the mechanism unveiled by us, the first semicatalysis produced the intermediates quickly, but the further oxidation proceeded slowly at room temperature, leading to intermediate accumulation. Utilization of electromagnetic induction triggered the second semicatalysis to recover the catalyst. Its validity was proved by a set of experiments conducted on a fixed bed and in the simulation house. Remarkably, the monolith catalyst of Ni foam-supported δ-MnO2 eliminated indoor HCHO from the simulation bin at room temperature, and was regenerated by a commercial induction stove; thus, the “storage-regeneration” cycling process was achieved.