Heterogeneous oxidation of mercury in simulated post combustion conditions
Heterogeneous oxidation of mercury in simulated post combustion conditions
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DOI：
10.1016/s0016-2361(02)00254-5
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发表时间：
2003
期刊：
影响因子：
7.4
通讯作者：
G. A. Norton;Hongqun Yang;Robert C. Brown;D. Laudal;G. Dunham;J. Erjavec
中科院分区：
文献类型：
--
作者：
G. A. Norton;Hongqun Yang;Robert C. Brown;D. Laudal;G. Dunham;J. Erjavec
非均相汞氧化研究暴露整个飞灰样品和磁性，颗粒，和大小分类飞灰馏分元素汞蒸汽在模拟烟气流。使用来自次烟煤Wyodak-Anderson PRB煤和烟煤Blacksville煤的飞灰。采用扫描电镜、X射线衍射、热重分析和BET N2等温吸附等方法对粉煤灰样品进行了表征。使用安大略Hydro方法确定了灰下游的汞形态。结果表明，飞灰的存在是关键的汞氧化，和灰的表面积似乎是一个重要的参数。然而，对于一个给定的飞灰，一般没有重大差异，在催化氧化电位之间的不同飞灰馏分。这包括富含未燃烧碳和铁氧化物的馏分。NO2、HCl和SO2的存在导致更高水平的汞氧化，而NO抑制汞氧化。气体基质对汞氧化的影响大于飞灰成分。
Heterogeneous mercury oxidation was studied by exposing whole fly ash samples and magnetic, nonmagnetic, and size-classified fly ash fractions to elemental mercury vapor in simulated flue gas streams. Fly ash from sub-bituminous Wyodak–Anderson PRB coal and bituminous Blacksville coal were used. Scanning electron microscopy, X-ray diffraction, thermogravimetric analyses, and BET N2isothermal sorption analyses were performed to characterize the fly ash samples. Mercury speciation downstream from the ash was determined using the Ontario Hydro method. Results showed that the presence of fly ash was critical for mercury oxidation, and the surface area of the ash appears to be an important parameter. However, for a given fly ash, there were generally no major differences in catalytic oxidation potential between different fly ash fractions. This includes fractions enriched in unburned carbon and iron oxides. The presence of NO2, HCl, and SO2resulted in greater levels of mercury oxidation, while NO inhibited mercury oxidation. The gas matrix affected mercury oxidation more than the fly ash composition.