The Study on the Capacity of NOx Storage-Reduction Catalyst for Lean-Burn Engine
Components in NOx storage reduction (NSR) catalysts have been studied in order to identify their impact on NSR performance. In order to enhance the catalytic performance of the NSR catalyst, the hydrothermal stability and sulfur tolerance of the NSR catal
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Abstract Components in NOx storage reduction (NSR) catalysts have been studied in order to identify their impact on NSR performance. In order to enhance the catalytic performance of the NSR catalyst, the hydrothermal stability and sulfur tolerance of the NSR catalyst were improved by developing new NSR formula. The results show that Pt/BaO/Ce0.7Zr0.3O2 ? Rh/Al2O3 catalyst has superior NSR activity, thermal stability and sulfur tolerance. The influence of space velocity, oxygen concentration and Lean-Rich period on the NSR activity was investigated.
Keywords Lean-burn engine NOx storage reduction Thermal stability Sulfur tolerance
1 Introduction Lean-burn engines are attracting more and more attention than conventional gasoline engines due to their higher fuel efficiency and lower CO2 emission. However, under lean-burn conditions, the toxic NOx exhaust emissions cannot be efficiently reduced over the classical three-way catalysts in the presence of F2012-A04-005 J. Wang (&) Y. Wang S. Liu J. Gao J. Ma China Automotive Technology and Research Center, Tianjin 300162, China e-mail: [email protected] M. Shen School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
SAE-China and FISITA (eds.), Proceedings of the FISITA 2012 World Automotive Congress, Lecture Notes in Electrical Engineering 189, DOI: 10.1007/978-3-642-33841-0_46, Ó Springer-Verlag Berlin Heidelberg 2013
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excessive O2. Therefore, selective catalytic reduction (SCR) and NOx storagereduction (NSR) catalysts have been developed [1–3]. Because of their ability to achieve high NOx conversions over a range of temperatures without the need for additional on-board reluctant, and require less mounting space, NOx StorageReduction (NSR) technology is regarded as the most practical technology for leanburn gasoline and diesel vehicles. The development of advanced catalyst makes one of the major contributions to the improvement of NSR technology. A typical NSR catalyst formulation contains NOx storage components, noble metals and support oxides. The combined interactions of these three components efficiently remove NOx from vehicle exhaust through the periodic operations of NOx oxidation, NOx sorption, NOx release and NOx reduction. Since the 1990s, NSR technology has been extensively studied, providing fundamental insights into the relevant reactions, mechanisms, kinetics, and roles of different catalytic components [4]. However, the role of every component in the NSR performance and the inter-component relationship are still not very clear. Meanwhile, the state-of-the-art NSR catalyst (Pt/BaO/Al2O3) is weakly resistant to sulfur poisoning and thermal treatment. So it’s necessary to develop the higher catalytic activity, thermal stability and sulphur tolerance NSR catalyst to meet the commercial requirements. In this work, the influence of NOx storage components, noble metals and support oxides on the catalytic activity was investigated. In this work, the influence of NOx storage co
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