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Improvement of NOx Reduction Efficiency Using Urea SCR System
Published October 03, 2012 by Society of Automotive Engineers of Japan in Japan
The purpose of this study is reduction of NOx emission from a heavy-duty diesel engine using the Urea SCR (Selective Catalytic Reduction) system at the low temperature. The performance of NOx reduction especially at low temperature was investigated to the influence of NOx/NO ratio at the inlet of Urea-SCR catalyst and the effect of NH₃ adsorption on the Urea-SCR catalyst. The SCR catalysts were coated by the zeolite with different active metal. At first, the zeolite was evaluated for NH₃ adsorption performance. In next step, the two active metals were tested for NO oxidation performance at the low temperature and NO adsorption performance. The NOx reduction efficiency was evaluated using simulated gas experiment. In this study, the improvement of NOx reduction catalyst at the low temperature is discussed about evaluated new material catalysts.