Abstract
The K-Birnessite type MnO2 was recognized to be a promising material to remove indoor low-level formaldehyde at room temperature. However, moisture was considered to significantly affect the activity of MnO2 for working durably in the complex indoor environment. Here, we prepared a hierarchical porous δ-MnO2 with modest moisture adsorption–desorption content. The formaldehyde removal efficiency exceeds 90% for 200 h test at high gas-hourly space velocity (GHSV: 600 L·g−1·h−1) in both high and low humidity environments, indicating an excellent humidity tolerance. This work provides a meaningful long lifetime catalyst for using in an indoor environment.
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