Tungsten doped manganese dioxide for efficient removal of gaseous formaldehyde at ambient temperatures

Publication date: 5 July 2018
Source:Materials & Design, Volume 149
Author(s): Fang Liu, Ranran Cao, Shaopeng Rong, Pengyi Zhang
Room-temperature active catalysts are very important to combat against ubiquitous indoor HCHO pollution. Here, tungsten doped MnO2 (W-MnO2) was first synthesized and investigated for HCHO decomposition at ambient temperature. With addition of WCl6 as precursor into the mixture of permanganate and manganese chloride, tungsten-doped δ-MnO2 with weak crystallinity and large specific surface area (>230m²/g) was synthesized. Substitution of W⁶⁺ for Mn in MnO6 groups reduced the chemical valence of Mn and made adsorbed surface oxygen species more active. As a result, the W-MnO2 catalyst with the nominal W/Mn ratio achieved efficient and stable activity for real-level indoor HCHO (0.3mg/m³) under the GHSV as high as 600L/gcat·h, the removal efficiency reaching 90% at 30°C and 60% at 5°C, respectively.

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