Mn-Cu-La/TiO_2低温催化剂催化还原氮氧化物性能研究

采用浸渍法制备了Mn-Cu-La/TiO2催化剂,研究了其组分配比、焙烧温度等制备条件和NO进口浓度、空速、O2含量、NH3/NO摩尔比等操作条件对Mn-Cu-La/TiO2上NH3低温还原NO活性的影响;探讨了H2O、SO2对Mn-Cu-La/TiO2活性的影响.结果表明,该催化剂具有很好的低温SCR活性,空速为10 000h-1,反应温度为150℃下时NO转化率接近99.6%.180℃下同时通SO2、H2O后的360min内,活性始终保持在95%以上;单独通入SO2时,该催化剂较容易中毒;单独通入体积分数10%的H2O对催化剂活性基本没有影响,转化率始终保持在98%以上.

Catalytic reduction of NO over Mn-Cu-La/TiO2 catalysts at low reaction temperatures

The Mn-Cu-La/TiO2 catalyst was prepared by impregnating the titania with metal salts.The influence of component ratio,calcinations temperature,feed composition,gas hourly space velocity(GHSV),oxygen content and NH3/NO on NO conversion were examined.The effect of steam and SO2 was also discussed.Experimental results show that Mn-Cu-La/TiO2 catalyst has good SCR activity at low temperatures.High NO conversion of over 99.6% was observed at 150 ℃ and space velocity 10 000 h-1.When both SO2 and H2O were added in feed gas,the NO conversion could be kept over 95% at 180 ℃ for 360 minutes.However,it was observed that the loss of catalytic activity was quick when SO2 was added in feed gas alone;while 10% H2O alone in feed gas had little negative effect on the catalytic activity,which is always over 98% at this situation.