摘要
采用聚合羟基复合阳离子合成交联粘土Zr-RE-PILC(RE=Ce、La、Y),经SO42-改性后,以浸渍法制备了用于C3H6选择性还原NO的铜基交联粘土催化剂Cu(3%,质量分数)/Zr-RE-PILC,在微型反应器上考察了稀土元素La、Ce、Y的引入对催化性能的影响,并采用XRD技术对催化剂进行了表征.结果表明,引入Ce可以显著提高催化剂的高温活性和载体的热稳定性.当Zr/Ce摩尔比为5、老化温度为65℃、焙烧温度为500℃时,可以合成热稳定性良好的Zr-Ce-PILC复合交联粘土载体.采用Cu/Zr-Ce-PILC催化剂,在反应温度为300℃、反应气组成为0.22%NO-0.15%C3H6-2%O2-97.63%He、空速为50 000mL/(h.g)的条件下,NO的转化率可达65%;反应温度为500℃时NO的转化率仍达22.5%.
The clay pillared by muhi-oligomeric hydroxyl cation was used to synthesize Zr-RE-PILC （ RE = Ce, La, Y） supports, and was treated by SO4^2-. Then, Cu-based pillared clay catalyst Cu/Zr-RE-PILC with a Cu mass fraction of 3% was prepared by means of impregnation. Moreover, the catalytic performance of Cu/Zr-RE-PILC for the selective reduction of NO by propylene in the presence of Ce, La and Y was investigated in a micro reactor. XRD was finally adopted to characterize the catalyst. The results indicate that both the catalytic activity for the selective reduction of NO and the thermal stability of the supports at a high temperature can be improved by introducing Ce in the catalyst, that Zr-Ce-PILC support with excellent thermal stability can be synthesized in a Zr/Ce ratio （molar ratio） of 5 at an aging temperature of 65℃ and a calcination temperature of 500℃, and that, when the feed composition is 0. 22% NO-0. 15% C3H6-2% 02-97.63% He and the space velocity is 50000mL/（h-g）, the NO conversion reaches 65% at a reaction temperature of 300℃, and reaches 22. 5% even at a reaction temperature of 500℃ over Cu/Zr-Ce-PILC catalyst.
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2007年第5期109-112,共4页
Journal of South China University of Technology(Natural Science Edition)
基金
广东省科技计划项目(2003C34501)
关键词
稀土金属
铈
交联粘土催化剂
氮氧化物
选择性还原
rare earth metal
cerium
pillared clay catalyst
nitrogen oxide
selective reduction
