掺杂型Mn-La/Ti-PILC催化剂的低温SCR脱硝研究

摘要

A series of Mn/Ti-PILC and Mn-La/Ti-PILC (k＝0/1,1/4,1/12 and 1/20)materials were prepared by the method of impregnation. The effects of La doping on Mn/Ti-PILC for low temperature SCR were studied, and also the materials were characterized by BET, H2-TPR, NH3-TPD and XRD. It showed that with the doping of La, the reduction temperature of the catalysts lowered, and the redox abilities of the catalysts enhanced. The weak acid on the material surface increased due to the introduction of La. The doping of La was beneficial to the SCR activity. Mn-La/Ti-PILC (k=l/12) showed the best activity.%采用共浸渍法制备了Mn/Ti-PILC和La掺杂的Mn-La/Ti-PILC(k为La和Mn物质的量比,k=0/1、1/4、1/12和1/20)四种催化剂.研究了La的掺杂对催化剂的低温脱硝效率的影响,同时通过BET、H2-TPR、NH3-TPD和XRD等方法对催化剂进行表征.结果表明,La的掺杂使催化剂的还原温度向低温方向迁移,氧化还原能力得到了提高,催化剂的表面酸量得到提高;La的掺杂有利于催化剂活性的提高,其中,Mn-La/Ti-PILC(k=1/12)催化剂的低温SCR的脱硝活性最高.