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Performance Evaluation and Application of Diesel NOx-SCR Catalyst by Ethanol Reductant
Technical Paper
2005-01-1089
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A catalyst surfaced on Ag/Al2O3 substrate for the selective catalyst reduction (SCR) of NOx by ethanol was evaluated in a diesel engine, and the effect of the catalyst on the reduction of NOx from the diesel engine under the EURO III ESC test modes was also investigated. The reductant injecting device was designed by means of computational fluid dynamics (CFD) analysis, and the engine test bench including the reductant injection system for the evaluation of the NOx-SCR catalyst performance was established. On the bench, the SCR catalyst with the ethanol reductant was tested at different temperatures and space velocities (SV), and integrated with an oxidation catalyst to reduce the diesel exhaust emissions of NOx, HC and CO. Under the conditions of the SV=30,000 h-1 and the exhaust temperature range of 350∼420°C, the NOx conversion efficiency is high over 90% and low beyond the temperature range. The catalyst performance will be greatly deteriorated when the space velocity is large than 40,000 h-1. With the increase of the ethanol injection quantity, the NOx conversion is increased, but the CO and THC emissions are undesirably increased simultaneously. By optimizing the strategy of the ethanol dosing, the integration of the NOx SCR catalyst and the CO/HC oxidation catalyst can reduce the emissions from the diesel engine to meet more stringent emission regulations.
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Authors
- Shijin Shuai - State Key Laboratory of Automotive Safety and Energy, Tsinghua University
- Jianxin Wang - State Key Laboratory of Automotive Safety and Energy, Tsinghua University
- Rulong Li - State Key Laboratory of Automotive Safety and Energy, Tsinghua University
- Jianjun Sun - State Key Laboratory of Automotive Safety and Energy, Tsinghua University
- Licheng Xiang - State Key Laboratory of Automotive Safety and Energy, Tsinghua University
- Hong He - Research Center for Eco-Environment Sciences, The Chinese Academy of Sciences
- Xiaoyan Shi - Research Center for Eco-Environment Sciences, The Chinese Academy of Sciences
Topic
Citation
Shuai, S., Wang, J., Li, R., Sun, J. et al., "Performance Evaluation and Application of Diesel NOx-SCR Catalyst by Ethanol Reductant," SAE Technical Paper 2005-01-1089, 2005, https://doi.org/10.4271/2005-01-1089.Also In
Diesel Exhaust Emission Control and Modeling on CD-ROM from the SAE 2005 World Congress
Number: SP-1981CD; Published: 2005-04-11
Number: SP-1981CD; Published: 2005-04-11
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