收稿日期: 2015-03-13
修回日期: 2015-07-07
网络出版日期: 2016-03-15
基金资助
江苏省自然科学基金(BK20130459)资助
Selective catalytic reduction of NO with CH4 on La1-xSrxMnO3 catalysts
Received date: 2015-03-13
Revised date: 2015-07-07
Online published: 2016-03-15
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)SrxMnO3 (x=0.2、0.4)催化剂.SEM表征表明La0.8Sr0.2MnO3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La0.8Sr0.2MnO3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La0.6Sr0.4MnO3的高活性反应条件与La0.8Sr0.2MnO3相似.在低温区,La0.6Sr0.4MnO3的NO脱除率在600 ℃时达到40%,而La0.8Sr0.2MnO3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.La0.6Sr0.4MnO3为催化剂的反应活化能比La0.8Sr0.2MnO3为催化剂时低.
张航 , 黄思嘉 , 李娜 , 周屈兰 . La1-xSrxMnO3催化剂催化CH4选择性还原NO的实验研究[J]. 中国科学院大学学报, 2016 , 33(2) : 234 -239 . DOI: 10.7523/j.issn.2095-6134.2016.02.014
The perovskite catalysts La1-xSrxMnO3 (x=0.2, 0.4) powders and supported catalysts via sol-gel method were successfully synthesized. The images of SEM show that La0.8Sr0.2MnO3 had a continuous and complete porous structure. The catalytic activity of supported La1-xSrxMnO3 catalyst was tested in fixed bed reactor. The NO conversion ratio of La0.8Sr0.2MnO3 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 La0.6Sr0.4MnO3 acted similarly. At 600 ℃ the NO conversion ratio of La0.6Sr0.4MnO3 was up to 40%, while the ratio of La0.8Sr0.2MnO3 was only 20%. Besides, the activation energies for these two catalysts were calculated, and the activation energy for La0.6Sr0.4MnO3 was lower than that for La0.8Sr0.2MnO3.
Key words： perovskite; methane; NO; selective catalytic reduction
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