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研究论文

房晶瑞,吴彦霞,雷本喜,汪澜,考宏涛.负载型Mn-Co/TiO₂催化剂的制备及其低温NH₃选择催化还原NO[J].环境科学学报,2014,34(4):849-856

Preparation and catalytic performance of supported Mn-Co/TiO₂ catalyst used for selective reduction of NO with NH₃ at low temperatures

摘要：采用浸渍法制备了一系列以成型TiO₂为载体的Mn-Co/TiO₂低温SCR催化剂，研究分析了活性组分担载量、Mn含量、焙烧温度、焙烧时间等制备参数和进口NO浓度、空速、O₂体积分数、NH₃/N₂摩尔比等操作条件对催化剂脱硝反应活性的影响.结果表明：活性组分担载量为30%，Mn/（Mn+Co）摩尔比为80%，在500 ℃下焙烧6 h得到的Mn-Co/TiO₂催化剂具有较高的NO转化率；在进口NO浓度为600×10^-6、O₂体积分数6%、空速10000 h^-1、150 ℃条件下，NO脱除率接近100%.

Abstract：Mn-Co/TiO₂ catalysts using TiO₂ as supported material were prepared by a simple impregnation process. The effect of calcination conditions, loading amount of active components, molar ratio of Mn/(Mn+Ce), concentrations of NO and O₂, NH₃ /NO ratio and space velocity on catalytic performance of denitration were studied. The results showed that the as-prepared Mn-Co/TiO₂ catalysts have excellent catalytic activity at low temperature. The samples with active ingredient loading amount of 30% and Mn/(Mn+Co) molar ratio of 80% exhibit the best result of denitration when calcinated at 500 ℃ for 6 h. The value of n(NH₃)/n(NO) of such samples is nearly 1.0 under test condition of NO in feed 600×10^-6, GHSV of 10000 h^-1, and φ(O₂)=6% at 150 ℃.