Preparation and desulfurization performance of various MnOx materials for ship exhaust emissions control
Preparation and desulfurization performance of various MnOx materials for ship exhaust emissions control
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DOI：
10.1016/j.seppur.2020.117182
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发表时间：
2020-12-15
影响因子：
8.6
通讯作者：
Huang, Hongyu
中科院分区：
文献类型：
--
作者：
Li, Xing;Chen, Lintao;Huang, Hongyu
船舶尾气排放的二氧化硫（SO2）对环境和人体健康构成严重威胁。采用模板法、沉淀法、球磨法、煅烧法和微波法制备了具有不同物理化学结构的锰氧化物（MnOx）样品，用于船舶尾气脱硫。通过扫描电子显微镜、X射线衍射、X射线光电子能谱和Brunauer-Emmett-Teller分析对MnOx样品进行了表征。采用热重分析法对样品的脱硫性能进行了测试，并对不同MnOx样品的脱硫机理进行了研究。结果表明，MnOx的脱硫性能是由材料的孔结构、比表面积、晶体结构、Mn的价态含量和反应温度等因素综合影响的。MnOx的孔结构对其脱硫性能有很大的影响。在我们的实验中，使用模板法制备的tp-MnOx呈现出丰富的三维孔结构，大的比表面积，和优异的脱硫性能。在400 ℃下，tp-MnOx在第一小时中的平均SO2捕获率为0.283 g（SO2）/g（材料）中心点h。tp-MnOx的最高SO2捕获率为0.694 g（SO2）/g（材料），在500 ℃下观察到。
Sulfur dioxide (SO2) emissions from ship exhaust pose a serious threat to the environment and human health. In this study, various manganese oxide (MnOx) samples with different physical and chemical structures were prepared using template, precipitation, ball milling, calcination, and microwave methods for the desulfurization of ship exhaust. The MnOx samples were characterized intensively through scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and Brunauer-Emmett-Teller analysis. The desulfurization performance was measured via thermogravimetry, and the desulfurization mechanism of the different MnOx samples was investigated. Results showed that the desulfurization performance of MnOx was determined by the comprehensive influence of the material's pore structure, specific surface area, crystal structure, Mn valence content, and reaction temperature. The pore structure in MnOx considerably affected the desulfurization performance of MnOx. In our experiment, tp-MnOx prepared using the template method presented a rich 3D pore structure, a large specific surface area, and excellent desulfurization performance. At 400 degrees C, the average SO2 capture rate of tp-MnOx in the first hour was 0.283 g(SO2)/g(material)center dot h. The highest SO2 capture rate of tp-MnOx was 0.694 g(SO2)/g(material) observed at 500 degrees C.