SO2和H2O对Y掺杂Mn/TiO2选择性脱除NO的影响

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 mL/L及NH₃/NO为1的条件下，同时通入200 mL/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。

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

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.