SO_2和H_2O对Y掺杂Mn/TiO_2选择性脱除NO的影响  

Impact of SO_2 and H_2O on catalytic performance of Y-doped Mn/TiO_2 in the reduction of NO

作　　者：刘晓肖[1] 张舒乐[1] 钟秦[1] 姚瑶[1] 李小海[1] 

机构地区：[1]南京理工大学化工学院,江苏南京210094

出　　处：《化工进展》2012年第3期552-557,共6页Chemical Industry and Engineering Progress

摘　　要：采用溶胶-凝胶法制备了Y掺杂的TiO2载体,负载硝酸锰构成了Y掺杂的Mn-Y/TiO2催化剂。考察了焙烧温度、空速对其催化还原NO性能的影响,并对催化剂的抗SO2、H2O毒化性能进行了考察。结果表明,催化剂的最佳焙烧温度为500℃,催化剂的活性随空速的降低而升高,XRD分析Y掺杂抑制了锐钛矿晶相的转移,有利于催化剂活性组分的分散,从而提高催化剂的活性。Mn-Y/TiO2的抗毒化性能优于Mn/TiO2,在反应温度180℃、空速14000 h-1、氧含量为3%、NO浓度600?L/L及NH3/NO为1的条件下,同时通入200 L/L SO2和4%H2O,NO转化率从非掺杂的Mn/TiO2的48.2%上升到57.6%,Y掺杂提高了催化剂的抗毒化能力;FTIR分析表明催化剂中毒是由于生成了铵的硫酸盐或者锰、钇的硫酸盐。Y-doped TiO2 support was prepared by sol-gel method,followed by the impregnation of Mn oxides loading to form Mn-Y/TiO2 catalyst.The effects of calcination temperature and space velocity on the performance in the catalytic reduction of NO were studied.And the poisoned performance of anti-SO2,H2O was also investigated.The results showed that the optimal calcination temperature was 500 ℃,catalytic activity increased with the decrease of GHSV.XRD analysis indicates that Y doping could restrain the transfer from anatase phase to rutile,provide better dispersion of active components on catalyst surface,and therefore,increase the catalytic activity.The anti-poisoned performance of Mn-Y/TiO2 was better than Mn-Y/TiO2,under the condition of temperature 180 ℃,space velocity 14000 h-1,the oxygen content 3%,NO concentration 600 μL/L and NH3/NO,NO conversion was improved from 48.2% of Mn/TiO2 to 57.6%.Y doping could enhanced the anti-poisoned capability.FTIR analysis showed that the catalyst poisoning may result from the generation of ammonium sulfate or manganese,yttrium sulfate.

关 键 词：选择性还原NO SO2和H2O 锰/二氧化钛 Y掺杂 

分 类 号：X511[环境科学与工程—环境工程]