Simultaneous removal of NO and Hg0 from flue gas over MnSmCo/Ti catalyst at low temperature
Simultaneous removal of NO and Hg0 from flue gas over MnSmCo/Ti catalyst at low temperature
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DOI：
10.1016/j.proci.2020.06.295
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发表时间：
2020-09
影响因子：
1.5
通讯作者：
Lijun Liu;Sheng Su;Kai Xu;Mengxia Qing;Haifeng Li;Song Hu;Yi Wang;Long Jiang;J. Xiang
中科院分区：
文献类型：
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作者：
Lijun Liu;Sheng Su;Kai Xu;Mengxia Qing;Haifeng Li;Song Hu;Yi Wang;Long Jiang;J. Xiang
设计了用于低温下同时脱除NO和Hg0的MnSmCo/Ti催化剂。在温度为15 0~2 5 0 °C、空速为10 0 0 0h−1的条件下，MnSmCo/Ti催化剂的NO转化率为80%，N2选择性接近10 0%，Hg0脱色率为10 0%。HG平衡分析表明，Hg0的去除是通过化学吸附和催化氧化实现的。此外，结合程序升温脱附汞和X射线光电子能谱对汞的氧化机理进行了探讨。Hg0的氧化通过MARS-Maessen机理进行，吸附的Hg0与MnO结合形成弱结合的HgMnOx+1物种，并遵循Langmuir−HinShelwood机理，吸附的Hg0与活性NO2反应生成HgO。
The MnSmCo/Ti catalyst was designed for the simultaneous removal of NO and Hg0at low temperature. The MnSmCo/Ti catalyst exhibited 80% NO conversion, almost 100% N2selectivity and 100% Hg0removal in the absence of HCl within the temperature range of 150–250 °C with a gas hourly space velocity of 100,000 h−1. The influence of flue gas components on Hg0oxidation was investigated and the NO and O2are mainly responsible for Hg0oxidation. Hg balance analysis revealed that the Hg0removal was achieved through chemisorption and catalytic oxidation. Furthermore, the Hg0oxidation mechanism was explored using transient reaction along with temperature-programmed desorption of mercury and X-ray photoelectron spectroscopy. Hg0oxidation proceeds through Mars–Maessen mechanism in which adsorbed Hg0is bound to MnOxto form weakly bonded HgMnOx+1species and follows Langmuir−Hinshelwood mechanism, where adsorbed Hg0reacts with active NO2to generate HgO.