| CuBr2分解缓释-膜催化对零价汞的氧化性能研究 |
| 摘要点击 1686 全文点击 829 投稿时间：2013-05-30 修订日期：2013-07-08 |
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| 中文关键词 汞氧化 溴化铜 反应检测一体化装置 催化膜 Langmuir-Hinshelwood机制 |
| 英文关键词 mercury oxidation copper bromide reaction and in situ monitoring device catalysis membrane Langmuir-Hinshelwood mechanism |
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| 中文摘要 |
| 以置于多孔陶瓷膜中的CuBr2受热分解所释放的Br2为氧化剂，利用膜催化装置对Hg0氧化效率进行研究，并设计反应-就地检测一体化装置，避免下游气体管壁效应对实验结果带来的影响. 结果表明，MnOx/α-Al2O3催化膜对CuBr2分解所产生Br2的释放有较好的“缓释”作用. Hg0和Br2在催化膜表面的吸附和反应可用Langmuir-Hinshelwood机制描述. Hg0氧化效率随Br2浓度增大而升高，但在达到一定浓度后，Hg0和Br2的吸附速率及两者在催化膜表面的反应速率成为限速因素. 473~573 K时Hg0氧化效率变化较稳定. 烟气中SO2对Hg0氧化有一定抑制作用，NO无明显影响. |
| 英文摘要 |
| CuBr2 in the multi-porous ceramic membrane can release Br2 at high temperature, which was employed as the oxidant for Hg0 oxidation. Hg0 oxidation efficiency was studied by a membrane catalysis device. Meanwhile, a reaction and in situ monitoring device was designed to avoid the impact of Br2 on the downstream pipe. The result showed that the MnOx/α-Al2O3 catalysis membrane had a considerable "controlled-release" effect on Br2 produced by CuBr2 decomposition. The adsorption and reaction of Hg0 and Br2 on the surface of catalysis membrane obeyed the Langmuir-Hinshelwood mechanism. The removal efficiency of Hg0 increased with the rising of Br2 concentration. However, when Br2 reached a certain concentration, the removal efficiency was limited by adsorption rate and reaction rate of Hg0 and Br2 on the catalysis membrane. From 473 K to 573 K, the variation of Hg0 oxidation efficiency was relatively stable. SO2 in flue gas inhibited the oxidation of Hg0 while NO displayed no obvious effect. |
