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首页> 外文期刊>Aerosol and Air Quality Research >Characterization and SCR Performance of Nano-Structured Iron-Manganese Oxides: Effect of Annealing Temperature
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Characterization and SCR Performance of Nano-Structured Iron-Manganese Oxides: Effect of Annealing Temperature

机译：纳米结构铁锰氧化物的表征与SCR性能：退火温度的影响

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摘要

Nano-structured iron-manganese oxides composite was prepared by annealing of natural Mn-rich limonite at different temperatures (500, 600, 700, 800°C). Their SCR performances of NO removal by NH3 were evaluated, and SEM, TEM, XRD, XRF, BET, XPS, Raman, NH3-TPD were utilized to analyze the catalytic mechanism. The results indicated that after annealing at 500°C, the as-prepared iron-manganese oxides exhibited the best SCR performance in NO conversion and N2 selectivity (over 80%) at the temperature window of 150–300°C. An increase in annealing temperature from 500 to 800°C significantly increased the particle size resulting in the decrease of surface areas, active sites, and then SCR performances. The experimental results suggested the natural Mn-rich limonite was an excellent precursor for preparing iron-manganese oxides and possessed excellent SCR performance of NO removal by NH3. This study will provide a novel way for the preparation of SCR catalyst and exploit a new application field for natural limonite.
机译：纳米结构的铁锰氧化物复合材料是通过在不同温度（500、600、700、800°C）下对天然富锰褐铁矿进行退火而制备的。评价了其被NH3去除NO的SCR性能，并利用SEM，TEM，XRD，XRF，BET，XPS，拉曼，NH3-TPD分析了其催化机理。结果表明，在500°C退火后，所制备的铁锰氧化物在150–300°C的温度范围内表现出最佳的SCR性能，即NO转化率和N2选择性（超过80％）。退火温度从500升高到800°C会显着增加颗粒尺寸，从而导致表面积，活性位点和SCR性能的降低。实验结果表明，天然富锰褐铁矿是制备铁锰氧化物的优良前驱体，并且具有出色的SCR脱硝性能。该研究将为SCR催化剂的制备提供一种新途径，并为天然褐铁矿的开发提供新的应用领域。

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