Enhancement of Ce1−xSnxO2 support in LaMnO3 for the catalytic oxidation and adsorption of elemental mercury
Enhancement of Ce1−xSnxO2 support in LaMnO3 for the catalytic oxidation and adsorption of elemental mercury
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DOI：
10.1039/c6ra10006f
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发表时间：
2016-07
期刊：
影响因子：
3.9
通讯作者：
Haomiao Xu;Yongpeng Ma;Songjian Zhao;Wenjun Huang;Zan Qu;N. Yan
中科院分区：
文献类型：
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作者：
Haomiao Xu;Yongpeng Ma;Songjian Zhao;Wenjun Huang;Zan Qu;N. Yan
以锰基钙钛矿氧化物为活性中心，对燃煤烟气中的单质汞（Hg 0）进行了脱除研究。Ce 1 − xSnxO 2二元氧化物被选为LaMnO 3的催化剂载体，以提高催化氧化和吸附性能。Ce0.7Sn0.3O2在所制备的Ce 1 − xSnxO 2二元氧化物中具有最好的Hg 0去除性能;在350 °C下，Hg 0去除率为95.2%。LaMnO 3在低温（<200 °C）下具有更好的性能。LaMnO_3/Ce_（0.7）Sn_（0.3）O_2增大了反应温度窗口，提高了Hg 0的去除效率。通过XRD、BET比表面积测定、拉曼光谱、H2-TPR和XPS分析，研究了催化剂物化性质与催化性能的关系。Ce-Sn二元氧化物作为催化剂载体，增大了LaMnO 3的比表面积，增强了其还原性，提高了氧的流动性。此外，根据实验结果对Hg 0的去除机理进行了初步的探讨。本文还讨论了Ce、Sn和LaMnO_3的作用。
Mn-based perovskite oxide was used as the active site for elemental mercury (Hg0) removal from coal-fired flue gas. Ce1−xSnxO2 binary oxides were selected as the catalyst supports for LaMnO3 to enhance the catalytic oxidation and adsorption performance. Ce0.7Sn0.3O2 had the best Hg0 removal performance among the as-prepared Ce1−xSnxO2 binary oxides; the Hg0 removal efficiency was 95.2% at 350 °C. LaMnO3 had better performance at low temperatures (<200 °C). LaMnO3/Ce0.7Sn0.3O2 enlarged the reaction temperature window and enhanced the Hg0 removal efficiencies. The correlation between the physicochemical properties and the catalytic removal performance was investigated by XRD, BET surface area measurements, Raman spectroscopy, H2-TPR and XPS analysis. With the addition of Ce–Sn binary oxides as catalyst support, the surface areas of LaMnO3 was enlarged, the reducibility was enhanced and the oxygen mobility was improved. In addition, the Hg0 removal mechanism was illustrated on the basis of the experimental results. The roles of Ce, Sn and LaMnO3 were also discussed in this study.