负载型Mn-Fe/γ-Al2O3低温脱硝催化剂的性能

摘要

Low-temperature denitration catalyst Mn-Fe/γ-Al2O3 was prepared by theco-precipitation method. The performance of the catalysts for SCR reaction was evaluated with ammonia gas as the reductant in a fixed bed catalyst reactor. The effects of loading,active component ratio,calcination temperature,space velocity,oxygen content and mole ratio of NH3/NO on the catalysts’ performance at low temperature were examined. The catalysts were characterized by XRD and BET techniques. The result showed that NO conversion over the catalyst could be above 96% at 200℃ when the conditions of the metal loading of 20%,molar ratio of Mn/Fe 4∶1,space velocity of 16000h−1,oxygen content of 4%,and mole NH3/NO ratio of 1.2,were adopted.%采用共沉淀法制备了负载型Mn-Fe/γ-Al2O3低温SCR催化剂，运用固定床催化反应器，以氨气为还原剂，考察了负载量、活性组分配比、焙烧温度等制备条件和空速、O2体积分数、NH3/NO 摩尔比等操作条件对Mn-Fe/γ-Al2O3催化剂低温脱硝性能的影响，并通过 X 射线衍射仪（XRD）、比表面积测定仪（BET）等手段对催化剂进行表征。结果表明，负载质量分数为20%、n(Mn)∶n(Fe)=4∶1、焙烧温度为600℃、空速为16000h−1、O2体积分数为4%、NH3/NO摩尔比为1.2、反应温度为200℃的条件下，NO转化率达到了96%以上。