Unregulated emissions from a diesel engine equipped with vanadium-based
urea-SCR catalyst |
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Authors: | Lei Jiang Yunshan Ge Asad Naeem Shah Chao He and Zhihua Liu |
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Institution: | 1. School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China 2. School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China;Department of Mechanical Engineering, University of Engineering and Technology, Lahore 54000, Pakistan 3. School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China;School of Transportation, Machinery and Civil Engineering, Southwest Forestry College, Kunming 650224, China |
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Abstract: | The present work is aimed at the study of number-size distribution of particles, volatile organic compounds (VOCs), and carbonyl
compounds (CC) or carbonyls emitted from a 4-cylinder turbocharged diesel engine equipped with a vanadium-based urea selective
catalytic reduction catalyst. The engine was run on an electric dynamometer in accordance with the European steady-state cycle.
Pollutants were analyzed using an electric low pressure impactor, a gas chromatograph/mass spectrometer, and a high performance
liquid chromatography system for the number-size distribution of particles, VOCs, and CC emissions, respectively. Experimental results
revealed that total number of particles were decreased, and their number-size distributions were moved from smaller sizes to larger sizes
in the presence of the catalyst. The VOCs were greatly reduced downstream of the catalyst. There was a strong correlation between the
conversion of styrene and ethyl benzene. The conversion rate of benzene increased with increase of catalyst temperature. Formaldehyde,
acetaldehyde, acrolein and acetone were significantly reduced, resulting in a remarkable abatement in carbonyls with the use of the
vanadium-based urea-SCR system. |
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Keywords: | diesel engine selective catalytic reduction particulate volatile organic compounds carbonyls |
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