Citation: WANG Pan, ZHANG Bo, LUO Peng, SUN Chuan, LEI Li-li. Effects of Ba/Ce ratio on NO_x storage performance of NSR catalyst[J]. Journal of Fuel Chemistry and Technology, ;2017, 45(10): 1260-1265. shu

Effects of Ba/Ce ratio on NO_x storage performance of NSR catalyst

School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang 212013, China

Corresponding author: WANG Pan, wangpan@ujs.edu.cn
Received Date: 27 April 2017
Revised Date: 21 August 2017

Fund Project: The project was supported by the National Natural Science Foundation of China 51676090the Natural Science Foundation of Jiangsu BK20150513the Advanced Talents' Foundation of Jiangsu University 14JDG152The project was supported by the National Natural Science Foundation of China(51676090), the Natural Science Foundation of Jiangsu(BK20150513) and the Advanced Talents' Foundation of Jiangsu University(14JDG152)

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In order to explore the effects of Ba/Ce ratio on the NO_x storage performance of the catalyst, a series of Pt/xBa-(30-x)Ce/γ-Al₂O₃ (x=10, 15, 20, x is a mass fraction) NSR catalysts were prepared by a modified sol-gel method combined with an impregnation method, and their properties were characterized by means of X-ray diffraction (XRD), specific surface area analysis (BET), temperature programmed reduction of H₂ (H₂-TPR) and temperature programmed desorption of NO (NO-TPD). The results indicate that Ba mainly exists in the form of BaCO₃, and CeO₂ is present in the amorphous form. With the increase of x value, CeO₂ grain size decreases firstly and then increases. With the increase of Ce content, the high temperature reduction peak has a similar tendency with that of CeO₂ grain size. The NO-TPD results show that the NO_x adsorbed on the surface of the catalyst has a better thermal stability with the temperature below 350℃. The effects of Ba/Ce ratio on the NO_x storage performance were investigated by a simulated gas test platform. The results show that the NO_x storage capacity of the Pt/15Ba-15Ce/γ-Al₂O₃ catalyst has a maximum value of 47.1%, and the NO_x breakthrough time is 7 min. When the storage process completes, the NO₂/NO_x ratio of Pt/15Ba-15Ce/γ-Al₂O₃ catalyst is 28%. The NO_x storage efficiency increases firstly and then decreases, and different Ba/Ce ratios have great influences on the storage path of the catalyst. The catalyst presents excellent NO_x storage performance when the Ba/Ce ratio is 1.0. The experimental results provide a reference for the optimal design and application of NSR catalyst in the field of diesel exhaust after-treatment system.
- sol-gel method,
- NO_x storage and reduction,
- NO_x storage performance,
- Ba/Ce ratio,
- breakthrough time
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沈阳化工大学材料科学与工程学院沈阳 110142

Effects of Ba/Ce ratio on NOx storage performance of NSR catalyst

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Effects of Ba/Ce ratio on NO_x storage performance of NSR catalyst