摘要
为了高效经济地控制燃煤电站汞的排放,探索新型SCR催化剂上汞的催化氧化具有重要的学术价值和广阔的应用前景。Hg0在Mn Ox-Ce O2/γ-Al2O3(Mn Ce15)催化剂上被氧化后会以多种形态存在于催化剂表面,为确定Mn Ce15催化剂上汞的化合物的赋存形态,使用程序升温热分解方法研究了纯汞化合物的分解曲线,并与在不同烟气条件下处理过的Mn Ce15催化剂的分解脱附曲线进行了对比。研究确认了反应中Hg O、Hg Cl2、Hg(NO3)2和Hg SO4的生成,并根据实验结果分析了相应的汞化合物生成的反应路径。结果表明,在模拟烟气条件下Hg Cl2是主要的异相催化反应产物,同时可以在催化剂表面检测到少量Hg O和Hg SO4的生成。这一结论可为研究SCR催化剂上Hg0的催化氧化机理提供基础。
Hg0 oxidation over selective catalytic reduction（SCR） catalysts would be of great scientific and practical value to control mercury emission in coal-fired power stations. To elucidate the mercury species existing on the Mn Ox-Ce O2/γ-Al2O3（Mn Ce15） catalyst surface, a temperature programmed thermal decomposition（TPTD） method was used in this study to analyze the characteristics of the mercury species formed on the Mn Ce15 catalysts. A series of pure mercury compounds mixed with fresh Mn Ce15 were first studied for qualitative calibration. Then, the TPTD method was used to identify the Hg species on used Mn Ce15 catalysts pretreated under different operation conditions. The formation of Hg O, Hg Cl2, Hg（NO3）2 and Hg SO4 during the oxidation process was confirmed and the reaction pathways were proposed. The mercury species present were mainly Hg Cl2 after Mn Ce15 catalysts were used to oxidize Hg0 under simulated flue gas conditions. Hg O and Hg SO4 were found to exist in very low concentrations. This study provided the basis for the study on catalytic oxidation mechanism of Hg0 on SCR catalyst.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2015年第6期2082-2088,共7页
CIESC Journal
基金
高等学校博士学科点专项科研基金项目(20130142110086)~~
作者简介
罗小雨（1989-），女，硕士研究生。
