摘要
制备了Mn-Nb-TiO2催化剂,在提供HCl的模拟烟气中测试其催化氧化Hg0的性能,考察了活性组分Mn和助剂Nb的负载量、焙烧温度等对催化剂催化活性的影响,还讨论了模拟烟气中NH3、NO、SO2等的浓度对催化活性的影响。结果表明,活性组分Mn和助剂Nb均存在最佳负载量,分别为7%(质量分数,下同)和2%;焙烧温度对Mn-Nb-TiO2催化剂的脱汞率影响较大,焙烧温度为500℃时制备的催化剂的催化活性最好;烟气中的NH3和SO2会抑制Mn-Nb-TiO2催化剂的脱汞活性,可能是形成了竞争吸附,导致催化剂活性位点上Hg0的氧化反应效率降低。
Mn-Nb-TiO2 catalyst was prepared for catalytic oxidation of elemental mercury in simulated flue gas which containing HC1. Effect of Mn （active components） and Nb （additive component） loading quantity,calcinations temperature on catalytic activity of Mn-Nb-TiO2 catalyst was investigated, the influence of some ingredients （NH3, NO,SO2） in flue gas on mercury removal efficiency was also researched. Results showed that the optimum loading quantity of Mn and Nb was 7 %,2% （wt%） respectively; calcinations temperature had significant influence on cata-lytic property of Mn-Nb-TiO2 catalyst,and the optimum calcinations temperature was 500 ℃. NH3 and SO2 in flue gas could inhibit the activity of Mn-Nb-TiO2 catalyst. This might be caused by competitive adsorption of NH3 and SOzon active sites of catalyst and consequently decreased the Hg^0 oxidation efficiency.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2013年第12期41-44,共4页
Environmental Pollution & Control
基金
南方电网科技项目(No.K-GD2012-360)
