引用本文:
【打印本页】   【HTML】   【下载PDF全文】   View/Add Comment  【EndNote】   【RefMan】   【BibTex】
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被:浏览 862次   下载 886 本文二维码信息
码上扫一扫!
分享到: 微信 更多
The Study of the NOx Storage Mechanism and Property of the Catalyst Pt/Ba-Al-O
Li Xingang,Meng Ming,Lin Peiyan,Wang Wendong
Author NameAffiliation
Li Xingang Department of Chemical Physics, University of Science and Technology of China, Hefei 230026 
Meng Ming Department of Chemical Physics, University of Science and Technology of China, Hefei 230026 
Lin Peiyan Department of Chemical Physics, University of Science and Technology of China, Hefei 230026 
Wang Wendong Department of Chemical Physics, University of Science and Technology of China, Hefei 230026 
Abstract:
The NOxstorage catalyst Pt/Ba-Al-O was prepared by co-precipitation method. The sample was characterized by XRD, NO-TPD and NSC. The barium in the sample mainly exists as BaAl2O4except few BaCO3phase. Two kinds of Pt sites seem to operate. The NO-TPD peak at about 270℃corresponds to sites 1 and the other peak at about 500℃corresponds to sites 2. Sites 1 are responsible for NO adsorption and sites 2 are responsible for nitrate and nitrite formation. When the sample adsorbed NO at 300℃with 1.3% O2, the NO desorption from the sample reached the maximum. When the adsorption was carried out over a prereduced surface, the sample had a much better NOxstorage capacity than that over a preoxidized surface. The NSC results indicate that the optimum temperature region for NOxstorage is 300~450℃.
Key words:  NOxstorage catalyst, Pt, BaAl2O4, Storage mechanism
FundProject:国家自然科学基金项目(No. 29973037)和安徽省自然科学基金项目(No. 99045429).
Pt/Ba-Al-O催化剂储存NOx的性能和机理研究
李新刚,孟明,林培琰,汪文栋
摘要:
采用共沉淀法制备了Pt/Ba-Al-O样品.用XRD、NO-TPD以及NOx储存量测量等手段对样品进行了表征,并对NOx的储存机理进行了探讨.结果表明,样品中的主要成分是BaAl2O4,有少量BaCO3存在.在催化剂表面的Pt有两种吸附位,吸附位1为NO提供了吸附位,对应低温区的NO脱附峰;吸附位2使NO和O2在催化剂表面反应生成硝酸盐和亚硝酸盐,对应高温区的NO脱附峰.当吸附温度为300℃、O2的体积分数为1.3%时,NO的脱附量达到了最大值.经过还原处理样品的NO吸附能力比经过氧化预处理的样品强得多.样品储存NOx的最佳温区为300~450℃.
关键词:  氧化氮储存催化剂  Pt  BaAl2O4  储存机理
DOI:10.1088/1674-0068/14/4/501-506
分类号: