Pt添加方式对Mn基氧化物催化剂低温NSR活性的影响  

Effect of Pt Adding Method on the NSR Activity of the Mn-Based Oxide at Low Temperature

作　　者：李新刚[1,2] 葛超逸[1,2] 郭丽[1,2] 贤晖[1,3] 

机构地区：[1]天津大学化工学院,天津300072 [2]天津市应用催化科学与工程重点实验室,天津300072 [3]北洋国家精馏技术工程发展有限公司,天津300072

出　　处：《化学工业与工程》2015年第2期13-17,共5页Chemical Industry and Engineering

基　　金：国家自然科学基金(U1162103;U1232118);天津市自然科学基金(11JCYBJC03700);教育部新世纪优秀人才支持计划(NCET-10-0615);教育部留学归国人员科研启动基金(2011-1568)

摘　　要：分别采用Pt直接浸渍在Mn2O3上、Pt/Al2O3与Mn2O3分层耦合以及机械混合3种不同制备方法合成出Pt质量分数为1%的Mn基催化剂,并考察了其NOx储存性能以及NOx储存-还原循环活性。结果表明,机械混合的样品具有最大的NOx储存量和最高的消除效率。与Mn2O3样品相比较,机械混合的样品在150℃时的NOx储存量提高了2倍以上,高达368.1μmol·g-1,同时NOx的消除效率从0提高到48.1%。这是由于机械混合样品中Pt能够促使O2的解离,提高NOx储存效率;另外,机械混合样品中Pt与Mn的协同作用显著,从而提高了催化剂的NSR活性。The Mn-based catalysts were prepared by three different methods： Pt directly impregnating on Mn2O3,Pt/Al2O3 and Mn2O3delamination and mechanical mixing. And the Pt content of the catalysts was 1%（ mass fraction）. The NOxstorage capacity and NOxstorage-reduction cycle activity indicated that the sample mixing by machine exhibited the biggest NOxstorage capacity and highest eliminated efficiency. Compared with the Mn2O3 sample,the NOxstorage capacity of the mechanical mixing sample increased more than twice and reached 368. 1 mmol·g- 1at 150 ℃. Meanwhile,the NOxeliminated efficiency increased from 0 to 48. 1%. This was due to the Pt in the mechanical mixing sample could promote the oxygen dissociation and enhance NOxstorage efficiency. In addition,Pt had a significant synergistic effect on Mn in the mechanical mixing sample,then increasing the NSR activity of the catalyst.

关 键 词：MN2O3 PT 氮氧化物储存还原 低温 机械混合 

分 类 号：O643[理学—物理化学] TQ032.41[理学—化学]