Xu Yifan, Liu Rong, Ye Fei, Jia Feng, Ji Lingchen
a School of Environment , Nanjing Normal University , Nanjing , People's Republic of China.
b Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application , Nanjing Normal University , Nanjing , People's Republic of China.
J Air Waste Manag Assoc. 2017 Aug;67(8):899-909. doi: 10.1080/10962247.2017.1302021. Epub 2017 Mar 13.
A series of manganese-cerium oxide (MnO-CeO) catalysts supported by Ti-bearing blast furnace slag were prepared by wet impregnation and used for low-temperature selective catalytic reduction (SCR) of NO with NH. The slag-based catalyst exhibited high nitrogen oxide removal (deNO) activity and wide effective temperature range. Under the condition of NO = 500 ppm, NH = 500 ppm, O = 7-8 vol%, and total flow rate = 1600 mL/min, the Mn-Ce/Slag catalyst exhibited a NO conversion higher than 95% in the range of 180-260 °C. The activity of Mn/Slag catalysts was greatly enhanced with the addition of CeO. The results indicated that Ti-bearing blast furnace slag had suitable phase composition as good support of SCR catalyst.
Ti-bearing blast furnace slag is a kind of industrial waste in China. Much slag was underused and piling up, which could cause many environmental issues, such as enormous waste of titanium and groundwater and soil contamination by heavy metals in leachates. The utilization of slag as the support of SCR catalyst will not only make use of solid waste but also cut down the NO emitted from power plant.
通过湿浸渍法制备了一系列以含钛高炉矿渣为载体的锰铈氧化物（MnO-CeO）催化剂，并将其用于NH对NO的低温选择性催化还原（SCR）。基于矿渣的催化剂表现出高氮氧化物去除（脱硝）活性和较宽的有效温度范围。在NO = 500 ppm、NH = 500 ppm、O = 7 - 8 vol%以及总流速 = 1600 mL/min的条件下，Mn-Ce/矿渣催化剂在180 - 260 °C范围内的NO转化率高于95%。添加CeO后，Mn/矿渣催化剂的活性显著增强。结果表明，含钛高炉矿渣具有合适的相组成，可作为SCR催化剂的良好载体。
含钛高炉矿渣在中国是一种工业废弃物。大量矿渣未得到充分利用且堆积，这可能引发诸多环境问题，如钛资源的巨大浪费以及渗滤液中重金属对地下水和土壤的污染。将矿渣用作SCR催化剂的载体不仅能利用固体废物，还能减少发电厂排放的NO。
