制备条件对Mn-Fe/TiO2催化剂低温脱硝性能的影响

通过浸渍法制备了一系列Mn-Fe/TiO2催化剂，并采用XRD技术对其进行了表征，考察了锰前体种类、负载量（活性组分质量占载体质量的百分比）、Fe含量（Fe物质的量占活性组分物质的量的百分比）、焙烧温度等因素对催化剂低温选择性催化还原NO性能的影响。实验结果表明：以乙酸锰为前体制备的催化剂的脱硝活性明显高于以硝酸锰为前体制备的催化剂;负载量的增加有利于脱硝活性的提高，而Fe的添加对提高催化剂的活性有重要作用，但Fe含量超过15%后，对催化剂脱硝性能的影响并不明显;焙烧温度超过650 ℃时会使活性组分的结晶度提高，导致脱硝活性的降低。在锰前体为乙酸锰、负载量为15%、Fe含量为15%、焙烧温度为500 ℃、焙烧时间为6 h、反应温度为200 ℃的条件下，Mn-Fe/TiO2催化剂的NO转化率约为95%。

Effects of Preparation Conditions on Mn-Fe/TiO2 Catalyst Activity for NO Removal at Low Temperature

A series of Mn-Fe/TiO2 catalysts were prepared by impregnation method and characterized by XRD. The factors affecting the low-temperature selective catalytic activity of the catalysts for NO reduction were studied. The denitrification activity of the catalyst prepared using manganese acetate as precursor is much higher than that using manganese nitrate as precursor;The increasing of loading amount is beneficial to the improvement of denitrification activity; The addition of Fe is important for increasing of the catalytic activity，but the effect is not obvious when Fe content is over 15%;When the calcination temperature is over 650 ℃，the crystallinity of active component is increased leading to the decline of denitrification activity. Under the conditions of using manganese acetate as manganese precursor，loading amount 15%，Fe content 15%，calcination temperature 500 ℃，calcination time 6 h and reaction temperature 200 ℃，the NO conversion rate on the Mn-Fe/TiO2 catalyst is about 95%.