Unregulated emissions from a diesel engine equipped with vanadium-based urea-SCR catalyst  

作　　者：Lei Jiang Yunshan Ge Asad Naeem Shah Chao He Zhihua Liu 

机构地区：[1]School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China. [2]Department of Mechanical Engineering, University of Engineering and Technology, Lahore 54000, Pakistan [3]School of Transportation, Machinery and Civil Engineering, Southwest Forestry College, Kunming 650224, China

出　　处：《Journal of Environmental Sciences》2010年第4期575-581,共7页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No.50876013);support of Laboratory of Auto Performance and Emission Test,Beijing Institute of Technology

摘　　要：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.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.

关 键 词：diesel engine selective catalytic reduction particulate volatile organic compounds CARBONYLS 

分 类 号：U467.48[机械工程—车辆工程] U464.172[交通运输工程—载运工具运用工程]