One-pot synthesis of atomically dispersed Pt on MnO2 for efficient catalytic decomposition of toluene at low temperatures

• Published in: Applied catalysis. B, Environmental Environmental, 2019-11, Vol.257, p.117878, Article 117878
• Main Authors: Zhang, Huiyu, Sui, Shanhong, Zheng, Xianming, Cao, Ranran, Zhang, Pengyi
• Format: Article
• Language: English
• Subjects: Air purification; Air temperature; Carbon dioxide; Catalytic activity; Catalytic converters; Catalytic oxidation; Conversion; Degradation; Free radicals; Hydroxyl radicals; Indoor air purification; Indoor environments; Low temperature; Manganese; Manganese dioxide; Organic compounds; Oxidation; Platinum; Purification; Single atom; Toluene; VOCs; Volatile organic compounds
• ISSN: 0926-3373; 1873-3883
• DOI: 10.1016/j.apcatb.2019.117878

[Display omitted] •Single-atom Pt were deposited on Mn-defect rich δ-MnO2 with one-pot hydrothermal process.•Atomically Pt-deposited MnO2 exhibited excellent and stable activity for toluene decomposition at low temperature.•Hydroxyl radicals played an important role in the effective decomposition of toluene at room temperature. The catalytic degradation of volatile organic compounds (VOCs) at low temperature is still a great challenge for indoor air purification. In this paper, the doping of single-atom Pt into MnO2 with a one-pot hydrothermal process greatly improved the catalytic activity for toluene degradation at room temperature, achieving 100% conversion of 0.42 ppm toluene at 28 °C under the high gas-hourly-space-velocity of 300 L g−1 h−1. Furthermore, it achieved 100% conversion of 10 ppm toluene at 80 °C and complete oxidation into CO2 at 220 °C. The manganese and oxygen defects in MnO2 nanosheets effectively stabilized the single-atom platinum, and strong oxidative hydroxyl radicals (OH) is thought to contribute to its excellent performance.