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1. The Influence of Adsorbed NOx Stability on NOx Trap Capacity below 200 ℃: Ceria-Zirconia Containing LNT Catalysts | |||
WANG Xinquan,LV Liangfang,ZHANG Qingqing,ZHANG Yuewei,WANG Jun,SHEN Meiqing | |||
Environmental Science and Techology 17 December 2012 | |||
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Abstract:The NOx trap capacity has been investigated by temperature programmed adsorption (TPA) experiments over a variety of Ce/Zr-containing catalysts. A fresh (F) or aged (A) Ce/Zr component, such as Ce0.58Zr0.42O2 (CZ64) or Ce0.80Zr0.20O2 (CZ82), was physical mixed with Pt/Al2O3 (PA) to form a Ce/Zr-Pt/Al2O3 mixture. PA-FCZ64, PA-FCZ82 and PA-ACZ64 show significant improvement in slowing down the premature NO release as temperature ramp from 100 to 150 ℃ However, an obvious NO release occurs on PA-ACZ82 under the same conditions. Using in situ DRIFT spectrometer, we found that nitrites oxidation by lattice oxygen of Ce/Zr was promoted on the fresh samples. It results in low coverage of nitrite with high stability. On the other hand, a large amount of nitrite was formed on PA-ACZ82, which could desorb upon increasing temperature. XPS results show a surface enrichment of Zr on the Ce/Zr samples, and the degree of the enrichment on CZ64 is higher than that on CZ82 for both fresh and aged samples. Segregation of CeO2 from the Ce/Zr phase have occurred on ACZ82, resulting in a lower stability of the nitrite species. | |||
TO cite this article:WANG Xinquan,LV Liangfang,ZHANG Qingqing, et al. The Influence of Adsorbed NOx Stability on NOx Trap Capacity below 200 ℃: Ceria-Zirconia Containing LNT Catalysts[OL].[17 December 2012] http://en.paper.edu.cn/en_releasepaper/content/4500814 |
2. Fluorescence-enhanced based on multi-walled nanotubes and cupral system for copper(Ⅱ)determination | |||
Yang Yanlin | |||
Environmental Science and Techology 21 September 2009 | |||
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Abstract:A novel, sensitive and convenient determine technology based on the enhancing of the fluorescence intensity of multi-walled nanotubes (MWNTs(by copper(Ⅱ)and cupral complex was proposed.The MWNTs had the fluorescence at 367nm when excited at 230nm, when Cu2+ was added into the MWNTs and cupral system, it induces the enhancing of fluorescence emission at 367nm. Under optimum condition, the fluorescence intensity versus Cu2+ concentration gave a linear response with an excellent 0.99921 correlation coefficient, the linearity range of the calibration curve was 2.67×10-6 molL-1to 5.3×10-6 molL-1, the limit of detection(3σ/k) is 4.09×10-7molL-1, the concentrations of Cu2+ with the synthetic samples were determined by proposed method with a satifactory result. | |||
TO cite this article:Yang Yanlin. Fluorescence-enhanced based on multi-walled nanotubes and cupral system for copper(Ⅱ)determination[OL].[21 September 2009] http://en.paper.edu.cn/en_releasepaper/content/35324 |
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