活性炭纤维负载氧化镧催化净化NO的实验研究  

Catalytic Purification of NO over Active Carbon Fiber-Loaded La_2O_3 Catalysts

作　　者：李彩亭[1] 路培[1] 曾光明[1] 王群敬[1] 李群[1] 何林锦[1] 翟云波[1] 

机构地区：[1]湖南大学环境科学与工程学院,长沙410082

出　　处：《环境科学》2008年第11期3280-3284,共5页Environmental Science

基　　金：湖南省自然科学基金重点项目(03JJY2002);新世纪优秀人才支持计划项目(NCET-04-0769);教育部科学技术研究重点项目(105126);湖南省自然科学基金项目(06JJ4118)

摘　　要：以ACF作为载体制备了负载不同质量分数La2O3的负载型催化剂,研究了它们催化净化NO的活性和活性的稳定性,同时对比研究了ACF、HNO3/ACF净化NO的能力.正交实验结果表明,实验中最佳的氧气体积分数为5%,最佳空速为5 000m3.(m3.h)-1;催化实验结果表明,ACF的低温活性很差,HNO3/ACF净化NO的低温活性很好,但是其活性的稳定性很差;负载了La2O3的ACF能大幅提升ACF净化NO的能力,其活性中心为La2O3,La2O3的最佳负载量为20%,350℃以上时,20%La2O3/ACF催化净化NO的效率均在95%以上,在200℃恒温条件下,其催化活性约能持续8h;催化剂的理化特征实验结果表明,ACF、HNO3/ACF净化NO的机制与负载了La2O3的ACF净化NO的机制有着本质的区别.The active carbon fiber（ACF） loaded different contents of La2O3 catalysts were prepared, and their catalytic activities and dttrability for the purification of NO were investigated, and for comparison, those of ACF and HNO3/ACF for the title reaction were also investigated. The orthogonal experiment results showed that the best volume fraction of oxygen in the mixed gas was 5 %, and the best air speed of mixed gas was 5 000 m^3 ·（m^3· h） ^-1 . The catalytic experiment results showed that the activity of HNO3/ACF was better than that of ACF when the temperature was below 414.08~C ,but the activity durability of HNO3/ACF was inferior than that of ACF. The activity and the activity durability of ACF could be markedly increased when it was loaded La2O3 catalyst, the activity center of the catalyst was La2O3, and the La2O3 catalyst best load amount was 20 %, the activity of 20 % La2O3/ACF would above 95 % when the temperature was higher than 350℃, and its activity durability was about 8 h,which was superior than most of the catalysts that had been reported. The results of FT-IR and TG experiments also showed that the NO purification principle of ACF and HNO3/ACF was different from that of La2O3/ACF, when NO was purified by La2O3/ACF, the competition reactions took place between CO and NO.

关 键 词：活性炭纤维 三氧化二镧 一氧化氮 催化剂 净化 

分 类 号：X511[环境科学与工程—环境工程]