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Study of Structure and Property for the NOx Storage Catalyst BaZrO3 Containing Noble Metal
Gao Aimei,Lin Peiyan*,Tu Jing,Meng Ming,Li Quanxin
Author NameAffiliationE-mail
Gao Aimei Department of Chemical PhysicsUniversity of Science and Technology of ChinaHefei 230026  
Lin Peiyan* Department of Chemical PhysicsUniversity of Science and Technology of ChinaHefei 230026 fulin@ustc.edu.cn 
Tu Jing Department of Chemical PhysicsUniversity of Science and Technology of ChinaHefei 230026  
Meng Ming Department of Chemical PhysicsUniversity of Science and Technology of ChinaHefei 230026  
Li Quanxin Department of Chemical PhysicsUniversity of Science and Technology of ChinaHefei 230026  
Abstract:
A series of perovskite-type BaZrO3 catalysts are prepared by the sol-gel method. Their NOx storage capacity(NSC)and the resistance of SO2 poison are measured. XRD,XPS and FT-IR techniques are also used to characterize their structures and the influence of the structures on performance. The results indicate that,after calcinations at 750 and 900 ℃,the Ba and Zr species mainly exist in the form of perovskite BaZrO3 phase,and the BaCO3 and ZrO2 phases also exist. The presence of bulk nitrate is shown by XRD and FT-IR after BaZrO3 absorbing NOx . The Rh/BaZrO3 is prepared by doping 0.5%Rh on the BaZrO3 with the impregnation method. It is found that the Rh mainly deposits on the surface of catalyst. However,the noble metals 0.5% Rh or Pt well disperse on the surface of the sample after the BaZrO3 is mixed with γ-Al2O3 in equal weight proportion. The structure of perovskite BaZrO3 may be partly broken after doping Rh or Pt,because of the reduction by hydrogen in the process of preparing samples,and then some ZrO2 is enriched on the surface. The BaZrO3 catalysts possess high NSC and high resistance ability of SO2 poison. The NSC of Rh/BaZrO3 decreases compared to that of BaZrO3 . However,the NSC of the samples Pt/BaZrO3/γ-Al2O3 and Rh/BaZrO3/γ-Al2O3 increases by 78% and 15% respectively. It is noticed that the NSC enhances for all the samples containing noble metal Pt or Rh duing the 0.01%SO2 mixed with the NO and O2 . It implies that the NO oxidation is improved by SO2 .
Key words:  Ba-Zr perovskite phase,Pt or Rh,γ-Al2O3,NOx storage capacity,Resistance of SO2 poison
FundProject:
含贵金属的BaZrO3 储存NOx 催化剂结构及性能研究
高爱梅,林培琰*,屠兢,孟明,李全新
摘要:
用溶胶-凝胶法制备了钙钛矿型BaZrO3催化剂,再用等量浸渍法制备了Rh/BaZrO3样品,并制备了Rh/BaZrO3/γ-Al2O3和 Pt/BaZrO3/γ-Al2O3催化剂.对它们的NOx储存量(NSC)及其抗硫性能进行了测试,并用X射线衍射(XRD)、 X光电子能谱(XPS)和傅里叶变换红外光谱(FT-IR)等方法研究了它们的结构及其对性能的影响.结果表明, BaZrO3催化剂具有良好的储氮及抗硫性能,直接添加贵金属到BaZrO3中会使NSC降低,而混合γ-Al2O3后添加Pt或Rh可以大大提高N
关键词:  钡锆钙钛矿相  贵金属铂或铑  γ-氧化铝  NOx储存容量  抗硫性能
DOI:10.1088/1674-0068/17/4/485-488
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