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Mn-TiO_2催化剂烟气脱汞性能及反应机理 被引量:10

Performance and Mechanism of Catalytic Oxidation for Mercury by Mn-doped TiO_2 Catalysts in Flue Gas
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摘要 采用溶胶凝胶法制备了二氧化钛和掺杂锰离子的二氧化钛(Mn(x)-Ti O2),利用BET比表面积测试仪,X射线衍射仪和X射线光电子能谱仪对催化剂进行表征分析。在模拟烟气条件下,利用制备的Mn(x)-Ti O2在自制固定床反应器中进行了催化氧化脱除Hg0的实验研究。同时,也得到了烟气组分对催化剂脱汞性能的影响规律。结果表明,Mn的掺杂能提高催化剂的比表面积以及改善催化剂的孔隙结构;Mn的掺杂抑制Ti O2晶粒的生长;Mn在催化剂表面主要存在形式为MnO 2。结果表明,催化剂的脱汞性能随着Mn掺杂量的增加而提高;O2和NO对催化剂脱汞表现为促进作用,SO2和H2O对催化剂脱汞有抑制作用。在N2/SO2气氛下,SO2具有明显的抑制作用;而O2和NO能削弱SO2的抑制作用。提出了Mn(x)-Ti O2催化氧化单质汞的反应机理。 The catalysts of Ti O2 and Mn-doped Ti O2(Mn(x)-Ti O2) were prepared by a sol-gel method and characterized using surface area analysis(BET), X-ray diffraction(XRD) and X-ray photoelectron spectroscopy(XPS). The characteristics of the catalytic oxidation for elemental mercury by Mn(x)-Ti O2 was investigated experimentally using the fixed-bed reactor under the simulated flue gas. The effects of the different contents in flue gas on the mercury removal were obtained. The results indicated that Mn doping could increase the specific surface area of catalysts and improve their pore structure. The loading of Mn inhibits the grain growth of Ti O2. Mn O2 is the main existing form of Mn in the catalysts. With the increasing of the manganese content, the removal performance of elemental mercury by the catalyst of Mn(x)-Ti O2 is improved. O2 and NO promote removal of elemental mercury with Mn(10)-Ti O2. However, SO2 and H2 O has an inhibiting effect on elemental mercury removal. Without O2, SO2 limits Hg0 removal obviously, while in the presence of O2 or NO, the inhibition effect is weakened. The possible mechanism related in the catalytic oxidation was also proposed.
出处 《中国电机工程学报》 EI CSCD 北大核心 2015年第13期3331-3337,共7页 Proceedings of the CSEE
基金 国家自然科学基金(50976049) 江苏省自然科学基金(BK2011788 BK20130906) 江苏省高校自然科学基金(13KJB610011)~~
关键词 锰掺杂 二氧化钛 脱汞 催化氧化 烟气 Mn-doped TiO2 Hg0 removal catalytic oxidation flue gas
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