摘要
以等体积浸渍法为基础,实验探究了不同干燥方法,微波干燥和普通干燥制得负载型铜基分子筛催化剂M-4Cu-ZSM-5和4Cu-ZSM-5的脱硝活性。通过XRD和氮气吸脱附表征手段,探究了不同干燥方法对催化剂孔道结构、物相结构及脱硝活性的影响。结果表明:铜的引入对分子筛的脱硝活性具有明显的提升作用;微波干燥的M-4Cu-ZSM-5催化剂在低于200℃时其催化脱硝活性略高于普通干燥的4Cu-ZSM-5催化剂,在200~300℃时4CuZSM-5展现出更高的脱硝效率;微波处理会直接影响材料的孔道结构及活性物质的晶粒大小和分布,从而在一定程度造成催化活性的差异。
Copper-based ZSM-5 zeolite catalysts were prepared using different ways of drying, the microwave drying and the conventional way,that is,electric blasting drying,based on incipient wetness impregnation method. XRD and N2 physisorption techniques were employed to investigate the effect of drying method on porous structure,phase structure as well as catalytic activity. The results show that copper introduction significantly promotes the catalytic activity; below 200 ℃ the catalytic activity of the microwave-dried M-4Cu-ZSM-5 is slightly higher than the conventionally-dried 4Cu-ZSM-5, while between 200-300 ℃ the latter exhibites superior catalytic performance; porous structure,crystal size and distribution of the active species of the catalyst were directly affected by the microwave treatment,causing the differences in catalytic activity.
出处
《人工晶体学报》
CSCD
北大核心
2017年第8期1569-1574,共6页
Journal of Synthetic Crystals
关键词
SCR
干燥方法
微波
铜基分子筛
SCR
drying method
microwave
copper-based zeolite
