Ma Xiaolong, Zhao Dandan, Qian Jinjin, Ma Zichuan, Cui Jiansheng
School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China.
Hebei Key Laboratory of Inorganic Nano-Materials, College of Chemistry and Material Sciences, Hebei Normal University, Shijiazhuang 050024, China.
Molecules. 2022 Feb 23;27(5):1509. doi: 10.3390/molecules27051509.
To establish a novel approach for VOCs resource utilization, coupled -xylene oxidation and hematite reduction was investigated in this study in a high-temperature gas-solid reactor in the temperature range 300-700 °C. As the -xylene-containing inert gas (N) stream traveled through the hematite particle bed, its reaction behavior was determined in programmed heating and constant temperature modes. Consequently, the effect of bed temperature, flow rate and -xylene inlet concentration on both -xylene removal performance and degree of hematite reduction was studied. The raw hematite and solid products were analyzed by TGA, XRF, XRD and SEM-EDS. The results showed that a temperature above 300 °C was required to completely eliminate -xylene by hematite, and both -xylene removal capacity and degree of hematite reduction at 5% breakthrough points enhanced on increasing the temperature and decreasing the flow rate. The increment in temperature from 300 °C to 700 °C led to a gradual reduction of FeO to FeO, FeO and metallic iron. Thus, this study provides a novel, economic and promising technology for treating the VOC pollutants.
为建立一种挥发性有机化合物（VOCs）资源利用的新方法，本研究在300-700℃的高温气固反应器中研究了对二甲苯氧化与赤铁矿还原的耦合过程。当含对二甲苯的惰性气体（N）流通过赤铁矿颗粒床时，在程序升温模式和恒温模式下测定其反应行为。因此，研究了床层温度、流速和对二甲苯入口浓度对对二甲苯去除性能和赤铁矿还原程度的影响。采用热重分析仪（TGA）、X射线荧光光谱仪（XRF）、X射线衍射仪（XRD）和扫描电子显微镜-能谱仪（SEM-EDS）对原始赤铁矿和固体产物进行了分析。结果表明，赤铁矿完全去除对二甲苯需要300℃以上的温度，在5%穿透点时，对二甲苯去除能力和赤铁矿还原程度均随温度升高和流速降低而增强。温度从300℃升高到700℃导致FeO逐渐还原为FeO、FeO和金属铁。因此，本研究为处理VOC污染物提供了一种新颖、经济且有前景的技术。
