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The NOx Storage and Resistance of SO2 Poison on the BaCeO3 Perovskite Type Oxides
Chen Jiafu,MengMing,Lin Peiyan,Li Xingang,Gao Aimei,Yu Shouming
Author NameAffiliationE-mail
Chen Jiafu Department ofChemical Physics, University ofScience andTechnology ofChina, Hefei230026  
MengMing Department ofChemical Physics, University ofScience andTechnology ofChina, Hefei230026  
Lin Peiyan Department ofChemical Physics, University ofScience andTechnology ofChina, Hefei230026 fulin@ustc.edu.cn 
Li Xingang Department ofChemical Physics, University ofScience andTechnology ofChina, Hefei230026  
Gao Aimei Department ofChemical Physics, University ofScience andTechnology ofChina, Hefei230026  
Yu Shouming Department ofChemical Physics, University ofScience andTechnology ofChina, Hefei230026  
Abstract:
The BaCeO3perovskite type samples are prepared by the improved sol-gel method. Besides, the Pt/BaCeO3, Rh/BaCeO3, Pt-Rh/BaCeO3and the Pt/BaCeO3/γ-Al2O3, Rh/BaCeO3/γ-Al2O3, Pt-Rh/BaCeO3/γ-Al2O3are also prepared. The results showthat adding precious metals, the NSC of the BaCeO3samples decrease. The sequence ofNSC is the Pt>Rh>Pt-Rh. Adding onlyγ-Al2O3has no effect on the NSC of the BaCeO3sample. However, the NSC of Pt/BaCeO3/γ-Al2O3sample increases more than three times as much as that of the BaCeO3/γ-Al2O3. The reason of the Nox storage enhancement by adding precious metals is discussed. Combining with XRD analysis, the perovskite type of BaCeO3is the main active phase ofNOxstorage forthe Ba-Ce-Osample. The results also indicate thatthe BaCeO3and Pt/BaCeO3samples keep the ability to resist poison produced by SO2at≤0. 006% SO2, and the Pt/BaCeO3/γ-Al2O3 sample possesses not only high capacity of NOxstorage but also high ability to resist poison produced by SO2.
Key words:  NOxtraps, NOxstorage, BaCeO3perovskite type, Resistance of SO2
FundProject:
BaCeO3 钙钛矿型氧化物的储氮和抗硫性能研究
陈加福,孟明,林培琰*,李新刚,高爱梅,俞寿明
摘要:
采用改进的溶胶-凝胶法制备了钙钛矿结构的BaCeO3样品,在此基础上再用浸渍法制备了Pt/BaCeO3、 Rh/BaCeO3、 Pt-Rh/BaCeO3样品,并用机械混合γ-Al2O3,再浸渍贵金属的方法制备了Pt/BaCeO3/γ-Al2O3、 Rh/BaCeO3/γ-Al2O3、 Pt-Rh/BaCeO3/γ-Al2O3样品.储氮量(NSC)结果表明:对未加γ-Al2O3的BaCeO3来说,贵金属的加入反而使NSC减小.加入贵金属催化剂的储氮量(NSC)大小为: Pt的最大, Rh的次之, Pt-Rh的最小.γ-Al2O3的加入对BaCeO3吸收NO和O2没有影响.而对于BaCeO3/γ-Al2O3样品,贵金属的加入使NSC值提高了3倍以上.讨论了贵金属加入到BaCeO3/γ-Al2O3样品中显著提高样品储氮能力的原因.结合XRD结果表明,钙钛矿 BaCeO3相是Ba-Ce-O样品主要的NOx储存活性中心.NSC结果还表明, BaCeO3和Pt/BaCeO3催化剂在SO2为≤0.006%时具有较好的抗硫性能.而Pt/BaCeO3/γ-Al2O3催化剂不但具有较好的储氮能力而且具有更好的抗硫性能.
关键词:  氮氧化物阱  储氮性能  抗硫性能  钡铈钙钛矿型
DOI:10.1088/1674-0068/16/5/429-432
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