Zhang Huiyu, Zheng Xianming, Xu Tongzhou, Zhang Pengyi
State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China.
Beijing Key Laboratory for Indoor Air Quality Evaluation and Control, Beijing 100084, China.
ACS Appl Mater Interfaces. 2021 Apr 21;13(15):17532-17542. doi: 10.1021/acsami.1c01433. Epub 2021 Apr 7.
Room-temperature catalytic decomposition of low-concentration volatile organic compounds (VOCs) in indoor air is an exciting dream to solve their pollution. Herein, two kinds of rare-earth elements (Y and La) were separately doped into birnessite-type MnO nanosheets in the form of single atoms by the hydrothermal method. As-synthesized La/MnO achieved 100% removal of 10 ppm toluene at 40 °C under the gas hourly space velocity of 60 L g h, which was even somewhat better than the single Pt atom-doped MnO. In addition, La/MnO showed the good durability at room temperature for 0.5 ppm toluene removal under the GHSV of 300 L g h and could be effectively regenerated at 105 °C. GC/FID, online-MS and TD-GC/MS analysis demonstrated that only ignorable trace benzene (∼3.4 ppb, < one thousandth of inlet toluene) was generated in the gas phase during catalytic decomposition of 10 ppm toluene at room temperature. This research sheds light on the development of low cost and high activity catalysts for low-concentration VOC oxidation at room temperature.
室温催化分解室内空气中的低浓度挥发性有机化合物（VOCs）是解决其污染问题的一个令人兴奋的梦想。在此，通过水热法将两种稀土元素（Y和La）以单原子形式分别掺杂到水钠锰矿型MnO纳米片中。合成的La/MnO在气体时空速为60 L g h的条件下，于40 °C实现了对10 ppm甲苯的100%去除，甚至比单原子Pt掺杂的MnO还要好一些。此外，La/MnO在室温下对0.5 ppm甲苯的去除在300 L g h的气体时空速下表现出良好的耐久性，并且在105 °C下可以有效地再生。GC/FID、在线质谱和热脱附-气相色谱/质谱分析表明，在室温下催化分解10 ppm甲苯的过程中，气相中仅产生了可忽略不计的痕量苯（约3.4 ppb，<入口甲苯的千分之一）。这项研究为开发用于室温下低浓度VOC氧化的低成本、高活性催化剂提供了思路。
