Emission reduction characteristics of a catalyzed continuously regenerating trap after-treatment system and its durability performance

论文摘要

The primary purpose of this study was to investigate the effect of a catalyzed continuously regenerating trap（CCRT）system composed of a diesel oxidation catalyst（DOC）and a catalyzed diesel particulate filter（CDPF）on the main gaseous and particulate emissions from an urban diesel bus,as well as the durability performance of the CCRT system.Experiments were conducted based on a heavy chassis dynamometer,and a laboratory activity test as well as X-ray photoelectron spectroscopy（XPS）test were applied to evaluate the changes of the aged CCRT catalyst.Results showed that the CCRT could reduce the CO by 71.5%and the total hydrocarbons（THC）by 88.9%,and meanwhile promote the oxidation of NO.However,the conversion rates for CO and THC dropped to 25.1%and 55.1%,respectively,after the CCRT was used for one year（～60,000 km）,and the NO oxidation was also weakened.For particulate emissions,the CCRT could reduce 97.4%of the particle mass（PM）and almost 100%of the particle number（PN）.The aging of the CCRT resulted in a reduced PM trapping efficiency but had no observable effect on the PN;however,it increased the proportion of nucleation mode particles.The activity test results indicated that the deterioration of the CCRT was directly relevant to the increase in the light-off temperatures of the catalyst for CO,C3H8 and NO2.In addition,the decreased concentrations of the active components Pt2+ and Pt4+ in the catalyst are also important factors in the CCRT deterioration.

论文目录

• Introduction
• 1. Materials and methods
•   1.1. Experimental materials
•     1.1.1. Test vehicle
•     1.1.2. CCRT specifications
•   1.2. Experimental procedure
•     1.2.1. Heavy chassis dynamometer test
•       1.2.1. 1. Test bench.
•       1.2.1. 2. Driving cycle.
•       1.2.1. 3. Test procedure.
•     1.2.2. Catalytic activity evaluation
•     1.2.3. XPS evaluation
• 2. Results and discussion
•   2.1. Experimental result analysis
•     2.1.1. Exhaust temperatures and flow rates
•     2.1.2. Gaseous emissions
•     2.1.3. Particulate emissions
•   2.2. Activity evaluation of samples
•   2.3. Active element analysis by XPS
• 3. Conclusions

文章来源

类型: 期刊论文

作者: Yunhua Zhang,Diming Lou,Piqiang Tan,Zhiyuan Hu,Hu Li

来源: Journal of Environmental Sciences 2019年10期

年度: 2019

分类: 工程科技Ⅰ辑

专业: 环境科学与资源利用

单位: School of Automotive studies, Tongji University,School of Chemical and Process Engineering, Faculty of Engineering, University of Leeds

基金: supported by the National Key Research and Development Program of China (No. YS2017ZY020019),Research Project of Shanghai Committee of Science and Technology (No. 18DZ1202900),the China Scholarship Council (No. 201806260133)

分类号: X734.2

页码: 166-173

总页数: 8

文件大小: 1417K

下载量: 10