Welcome to Journal of Automotive Safety and Energy,
汽车安全与节能学报

Journal Of Automotive Safety And Energy ›› 2018, Vol. 9 ›› Issue (3): 317-324.DOI: 10.3969/j.issn.1674-8484.2018.03.011

• Automotive Energy Efficiency & Environment Protection • Previous Articles     Next Articles

Influence of CO2 concentration and exhaust temperature on adsorption path of LNT

LI Zhijun1, 2, CAO Lijuan1, SHUAI Shijin2, SHEN Boxi1, LIU Shiyu , ZHU Lingya1, WU Yue1   

  1. (1. State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China; 2. State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China)
  • Online:2018-09-30 Published:2018-10-08

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Abstract:

The gas file, surface file and thermal file of LNT in Chemkin were rewritten, and the adsorption model of lean NOx trap (LNT) , which included two kinds of adsorption paths, was developed to investigate the influence of CO2 concentration and temperature of lean burn gasoline exhaust on the adsorption path from
150 to 400 ℃ . The main research results show that the presence of CO2 has influence on the both paths, and CO2 has more inhibition on nitrite path than nitrate path. With the concentration of CO2 increasing, the effect of inhibition weakens. The influence of exhaust temperature on both of the paths is more significant. During low temperature 150-200 ℃ , nitrite path is major path because of the inactivation of nitrite evolution and NO oxidation. While at the high temperatures of 300 ℃ and 400 ℃ , two paths have similar occupancy

Key words: lean burn gasoline, lean NOx trap (LNT), carbon dioxide (CO2), temperature, adsorption path.