La_(1-x)Sr_xMnO_3催化剂催化CH_4选择性还原NO的实验研究  

Selective catalytic reduction of NO with CH_4 on La_(1-x)Sr_xMnO_3 catalysts

作　　者：张航[1] 黄思嘉[2] 李娜[1] 周屈兰[1] 

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,西安710049 [2]福建省电力勘测设计院,福州350003

出　　处：《中国科学院大学学报（中英文）》2016年第2期234-239,共6页Journal of University of Chinese Academy of Sciences

基　　金：江苏省自然科学基金(BK20130459)资助

摘　　要：采用溶胶-凝胶法和过量浸渍法制备粉末状及负载型La（1-x）SrxMn O3（x=0.2、0.4）催化剂.SEM表征表明La0.8Sr0.2Mn O3催化剂具有连续多孔结构.在设计的固定床反应器中,实验测试表明La0.8Sr0.2Mn O3在900-1 000℃、停留时间大于2.2 s、含氧量小于6%时的NO脱除率达到90%以上,而La0.6Sr0.4Mn O3的高活性反应条件与La0.8Sr0.2Mn O3相似.在低温区,La0.6Sr0.4Mn O3的NO脱除率在600℃时达到40%,而La0.8Sr0.2Mn O3只有20%.根据实验结果计算了两种催化剂无氧反应条件下的活化能.La0.6Sr0.4Mn O3为催化剂的反应活化能比La0.8Sr0.2Mn O3为催化剂时低.The perovskite catalysts La1- xSrxMn O3（ x = 0. 2,0. 4） powders and supported catalysts via sol-gel method were successfully synthesized. The images of SEM show that La0. 8Sr0. 2Mn O3 had a continuous and complete porous structure. The catalytic activity of supported La1- xSrxMn O3 catalyst was tested in fixed bed reactor. The NO conversion ratio of La0. 8Sr0. 2Mn O3 was above 90% when the duration was longer than 2. 2 s,the O2 concentration was less than 6%,and the temperature was around 900-1 000 ℃,and La0. 6Sr0. 4Mn O3 acted similarly. At 600 ℃ the NO conversion ratio of La0. 6Sr0. 4Mn O3 was up to 40%,while the ratio of La0. 8Sr0. 2Mn O3 was only 20%. Besides,the activation energies for these two catalysts were calculated,and the activation energy for La0. 6Sr0. 4Mn O3 was lower than that for La0. 8Sr0. 2Mn O3.

关 键 词：钙钛矿 甲烷 一氧化氮 选择性催化还原 

分 类 号：TQ032[化学工程] O643[理学—物理化学]