This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
An Ethanol SCR for NOx Purification: Performance Evaluation on Engine Bench and Demonstration on Bus
Technical Paper
2007-01-1240
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
NOx -SCR over Ag/ Al2O3 catalyst using ethanol (C2H5OH) as a reductant has proven its ability to significantly reduce NOx emission in a simulated engine exhaust gas environment. However the real engine exhaust gas environment is too complicated to be simulated. Therefore, the performance evaluation of the Ag/ Al2O3 catalyst in real exhaust gas environment is necessary. Moreover, the ethanol dosing device and control strategy also need to be validated for the practical use.
In this paper, firstly the catalyst performance and its sulfur tolerance was tested on an engine test bench and the effect of the catalyst on PM emission was investigated. Then the aftertreatment system composed of Ag/Al2O3 catalyst + Cu/TiO2 catalyst + Pt/TiO2 catalyst and ethanol dosing control based on open loop control was designed, and the diesel engine emission with the aftertreatment system was tested according to ESC test cycle. Finally, the whole aftertreatment system was integrated on a bus and demonstrated.
The performance test results showed that under the conditions of fresh catalyst and SV=30,000 h-1, high NOx conversion (up to 90%) can be obtained in the range of temperature 350∼450 °C. The aging test showed that sulfur absorbed on catalyst surface is the main reason for catalyst deactivation.
The Ag/ Al2O3 catalyst can effectively decrease the soluble organic fraction (SOF) in PM, but has little effect on dry soot (DS). The catalyst can also decrease the sulfate slightly when the exhaust temperature is below 410 °C, but dramatically increase the sulfate when the temperature is about 470 °C. Totally, the PM emission can be decreased more than half of the raw engine out when the exhaust temperature is 336 °C, but increased a little when the temperature is over 470 °C.
The emissions based on ESC test cycle showed that the engine with the aftertreatment system can completely meet EURO III regulations. Bus demonstration test result showed that the NOx conversion was less then 15%, which indicated that ethanol SCR has some obstacles to be overcome in vehicle road running.
Recommended Content
Authors
- Hongyi Dong - State Key Laboratory of Automotive Safety and Energy, Tsinghua University
- Shijin Shuai - State Key Laboratory of Automotive Safety and Energy, Tsinghua University
- Wenjuan Zhang - State Key Laboratory of Automotive Safety and Energy, Tsinghua University
- Rulong Li - State Key Laboratory of Automotive Safety and Energy, Tsinghua University
- Jianxin Wang - State Key Laboratory of Automotive Safety and Energy, Tsinghua University
- Xiaoyan Shi - Research Center for Eco-Environmental Sciences, The Chinese Academy of Sciences
- Hong He - Research Center for Eco-Environmental Sciences, The Chinese Academy of Sciences
Citation
Dong, H., Shuai, S., Zhang, W., Li, R. et al., "An Ethanol SCR for NOx Purification: Performance Evaluation on Engine Bench and Demonstration on Bus," SAE Technical Paper 2007-01-1240, 2007, https://doi.org/10.4271/2007-01-1240.Also In
References
- Wang J. X. Fu L. X. Li W. B. Automotive Emission Control and Catalytic Converter Chemical Engineering Press Beijing 2000
- Burch R. Breen J.P. Meunier F.C. A Review of the Selective Reduction of NOx with Hydrocarbons under Lean-Burn Conditions with Non-Zeolite Oxide and Platinum Group metal catalysts Applied Catalysis B: Environmental 39 2002 382 303
- Jan K. Paolo F. Neal H. Automotive catalytic converters: current status and some perspectives Catalysis Today 77 2003 419 449
- Yu Y. B He H. Feng Q. C. Gao H. W. Yang X. Mechanism of the selective catalytic reduction of NOx by C 2 H 5 OH over Ag/Al 2 O 3 Applied Catalysis B: Environmental 49 2004 159 171
- Zhang Changbin Shi Xiaoyan He Hong Selective Catalytic Reduction of NOx by Ethanol over Combined Catalyst Ag/ Al 2 O 3 -Cu/ Al 2 O 3 in Excess Oxygen [J] Chinese Journal of Catalysis 2005 26 8 645 649
- Miyadera T. Selective reduction of NOx by ethanol on catalysts composed of Ag-Al2O3 and Cu-TiO2 without formation of harmful by-products Applied Catalysis B: Environmental 16 1998 155 164
- Shi xiaoyan et. al. Emission reduction potential of using ethanol-biodiesel-diesel fuel blend on a heaby-duty diesel emgine Atmospheric Environment 40 2006 2567 2574