Cu-SSZ-13用于NH_(3)选择性还原NO_(x)实验教学设计

Experimental teaching design of Cu-SSZ-13 for the selective catalytic reduction of NO_(x)with NH_(3)

以柴油车尾气氮氧化物(NOx)净化处理为研究主题,结合氨气(NH3)选择性催化还原NOx技术(NH3-SCR)理论及研究成果,进行了Cu-SSZ-13用于NH3选择性还原NOx综合实验设计。实验采用液相离子交换法得到三种不同Cu负载量的Cux-SSZ-13催化剂,并对其进行了物理表征和催化活性评价。实验结果表明,不同Cu负载的催化剂均具有较高的结晶度,且分子筛载体结构变化不大;Cu3.9-SSZ-13催化剂在200~500℃范围内NOx转化率均高于90%,N2选择性高于98.5%,催化剂活性最优。该实验将技术研究热点与教学实践环节相结合,有助于培养学生的综合实验技能和科研素养。

Taking nitrogen oxide purification treatment as the research theme,combined with the theory and previous results of ammonia gas selective catalytic NOx technology(NH3-SCR).The comprehensive experiments of NH3-SCR over Cu-SSZ-13 catalyst was designed.Three Cux-SSZ-13 catalysts with different Cu loading were prepared by liquid-phase ion exchange method.Physical characterization and catalytic activity of three catalysts were evaluated.The results showed that the catalysts with different Cu loading possess high crystallinity.There was little change on the structure of the molecular sieve carrier.Cu_(3.9)-SSZ-13 catalyst showed the best performance.NOx conversion was higher than 90%and N2 selectivity was higher than 98.5%in the range of 200~500℃.This experiment organically combined research hotspots and basic teaching practice,which is helpful for cultivating comprehensive experimental skills and scientific research literacy of students.