SO<sub>2</sub>存在条件下M/REY催化剂NH<sub>3</sub>选择性还原NO性能研究

SO₂存在条件下M/REY催化剂NH₃选择性还原NO性能研究

摘要: 采用浸渍法制备了以REY为载体负载金属氧化物催化剂。采用XRD、NH₃-TPD、NO-TPD、H₂-TPR和XPS对催化剂进行表征,并在固定床微型反应器上评价SO₂存在条件下催化剂在NH₃选择还原NO反应中的活性。实验结果表明,活性组分种类及负载量均影响催化剂性能,Cu(3)/REY催化剂在NH₃选择还原NO反应中表现出较好的低温活性,在SO₂存在条件下,254~390℃时NO的转化率大于95%。催化剂表征结果显示,Cu(3)/REY催化剂的催化活性与其良好的氧化还原性和对NO的吸脱附性能相关。

Abstract: A series of M/REY(M=Cu, Mn, Fe, Ce) catalysts were prepared by impregnation method. The catalysts were characterized by XRD, NH₃-TPD, NO-TPD and H₂-TPR, and XPS. The catalytic activity of the catalysts was evaluated in the fixed-bed reactor for the selective catalytic reduction of NO with NH₃ in the presence of SO₂. The results show that the performance of catalysts was affected by the type and load of active component. The Cu(3)/REY catalyst exhibited good activity at low temperature in presence of SO₂. The NO conversion is over 95% at the temperature range of 254~390℃. The catalytic activity of Cu(3)/REY catalyst is related with its excellent redox properties and the performance of NO adsorption-desorption.