Abstract: Y-doped TiO₂support was preparedby sol-gel method，followed by the impregnation of Mn oxides loading toform Mn-Y/TiO₂catalyst.The effects of calcination temperature andspace velocity onthe performancein thecatalytic reduction ofNO were studied. And the poisoned performance of anti-SO₂，H₂O was also investigated. The resultsshowed that the optimal calcination temperature was 500 ℃，catalytic activity increased with the decrease of GHSV. XRD analysis indicates that Ydoping could restrainthe transfer fromanatasephase 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 velocity14000 h^-1，the oxygen content3%，NOconcentration 600 mL/LandNH₃/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.

Key words: selective reduction of NO, SO₂ and H₂O, Mn/TiO₂, Y-doped

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 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。

关键词: 选择性还原NO, SO₂和H₂O, 锰/二氧化钛, Y掺杂