用于燃煤烟气中单质汞去除的 MnO/CeO-MnO 分级二元氧化物的设计。
Design of MnO/CeO-MnO hierarchical binary oxides for elemental mercury removal from coal-fired flue gas.
机构信息
Henan Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration, School of Material and Chemical Engineering, Zhengzhou University of Light Industry, No. 136, Science Avenue, Zhengzhou 450001, China.
School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
出版信息
J Hazard Mater. 2017 Jul 5;333:186-193. doi: 10.1016/j.jhazmat.2017.03.032. Epub 2017 Mar 16.
MnO/CeO-MnO hierarchical binary oxide was synthesized for elemental mercury (Hg) removal from coal-fired flue gas. CeO in-situ grow on the surface of carbon spheres, and that CeO@CSs acted as precursor for porous MnO/CeO-MnO. XRD, Raman, XPS, FT-IR, and H-TPR were selected for the physical structural and chemical surface analysis. The results indicated that the composite has sufficient surface oxygen and hierarchical porous structure. The Hg removal experiments results indicated that MnO/CeO-MnO exhibited excellent Hg removal performance, with an 89% removal efficiency of total 300min at 150°C under 4% O. MnO was the primary active site for Hg catalytic oxidation. The porous structure was beneficial for gaseous mercury physically adsorption. In addition, CeO enhanced the oxygen capture performance of the composite and the oxidation performance for MnO. Moreover, the effects of O, SO and HO were also tested in this study. O promoted the Hg removal reaction. While SO and HO can poison the MnO active site, resulted in a low Hg removal efficiency.
MnO/CeO-MnO 分级二元氧化物被合成用于从燃煤烟气中去除元素汞（Hg）。CeO 原位生长在碳球表面，CeO@CSs 作为多孔 MnO/CeO-MnO 的前体。XRD、拉曼、XPS、FT-IR 和 H-TPR 被用于物理结构和化学表面分析。结果表明，该复合材料具有丰富的表面氧和分级多孔结构。Hg 去除实验结果表明，MnO/CeO-MnO 在 150°C 下，在 4%O 下，300min 内总汞去除效率达到 89%，表现出优异的 Hg 去除性能。MnO 是 Hg 催化氧化的主要活性位。多孔结构有利于气态汞的物理吸附。此外，CeO 还增强了复合材料的氧气捕获性能和 MnO 的氧化性能。此外，本研究还测试了 O、SO 和 HO 的影响。O 促进了 Hg 去除反应。而 SO 和 HO 可以使 MnO 的活性位中毒，导致 Hg 去除效率低。
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