不同制备方法的Mn-Ce催化剂低温SCR性能研究

Performance Study for Low-temperature SCR Catalysts Based on Mn-Ce Prepared by Different Methods

采用新型共沉淀法、浸渍法以及沉淀沉积法制备基于Mn-Ce的催化剂.对比60～160℃温度区间内三种方法制备的催化剂的低温选择性催化还原NO性能.运用X射线衍射(XRD)、比表面积(BET)、程序升温脱附(NH3-TPD)、程序升温还原(H2-TPR)等对催化剂的形貌与性质进行了表征.实验结果表明,共沉淀法制备的Mn-Ce/TiO2有更好的低温催化还原NO活性.影响沉淀法低温催化还原NO活性的主要因素是催化剂的表面积、活性组分的分布以及Mn与Ti之间的内在作用.

Catalysts based on Mn-Ce were prepared by co-precipitation, impregnation, deposition-precipi- tation methods. And the activity of the catalysts for selective catalytic reduction of NO were investigated at the temperature from 60 to 160℃. Their properties were charactered with X-Ray diffraction （XRD）, specific surface area, temperature programmed desorption （TPD）, temperature programmed reduction （TPR） and so on. It was indicated that the catalyst of Mn-Ce/TiO2 prepared by co-precipitation method had the better low temperature catalytic activity. The low temperature catalytic reduction NO activity was related to the surface area, the active ingredient distribution and interaction between Mn and Ti.