Research on real-road NH3 emissions of China-6 heavy-duty natural gas and diesel vehicles

IF 12.2 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Journal of Hazardous Materials Pub Date : 2025-02-11 DOI:10.1016/j.jhazmat.2025.137583

Zihao Ge, Changyu Wang, Zhe Ji, Yachao Wang, Luoshu Yang, Ying Huang, Liqun Lyu

{"title":"Research on real-road NH3 emissions of China-6 heavy-duty natural gas and diesel vehicles","authors":"Zihao Ge, Changyu Wang, Zhe Ji, Yachao Wang, Luoshu Yang, Ying Huang, Liqun Lyu","doi":"10.1016/j.jhazmat.2025.137583","DOIUrl":null,"url":null,"abstract":"In this paper, ammonia (NH3) emissions of China-5 and three-way catalyst (TWC)-fitted China-6 heavy-duty NG vehicles and SCR-fitted China-6 diesel vehicles were characterized during real-road emission tests. The results showed that, due to side reactions within TWCs, real-world NH3 emissions of China-6 NG vehicles were significantly higher than those of their diesel counterparts and those of China-5 NG vehicles without TWCs. For China-6 NG vehicles, NH3 emissions occurred during the light-off of the TWCs and rich combustion. SCR-fitted China-6 heavy-duty diesel vehicles also had NH3 emissions mainly caused by excessive SCR reductant injection and leakage from ammonia slip catalysts (ASC). China-5 heavy-duty NG vehicles emit little NH3 for they utilized lean-combustion without SCR or TWC, where NH3 forms. Although lean combustion NG engines hardly have NH3 emissions, the extremely high engine-out NOx emissions restricted its further application.","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"169 1","pages":""},"PeriodicalIF":12.2000,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Hazardous Materials","FirstCategoryId":"93","ListUrlMain":"https://doi.org/10.1016/j.jhazmat.2025.137583","RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, ENVIRONMENTAL","Score":null,"Total":0}

引用次数: 0

Abstract

In this paper, ammonia (NH₃) emissions of China-5 and three-way catalyst (TWC)-fitted China-6 heavy-duty NG vehicles and SCR-fitted China-6 diesel vehicles were characterized during real-road emission tests. The results showed that, due to side reactions within TWCs, real-world NH₃ emissions of China-6 NG vehicles were significantly higher than those of their diesel counterparts and those of China-5 NG vehicles without TWCs. For China-6 NG vehicles, NH₃ emissions occurred during the light-off of the TWCs and rich combustion. SCR-fitted China-6 heavy-duty diesel vehicles also had NH₃ emissions mainly caused by excessive SCR reductant injection and leakage from ammonia slip catalysts (ASC). China-5 heavy-duty NG vehicles emit little NH₃ for they utilized lean-combustion without SCR or TWC, where NH₃ forms. Although lean combustion NG engines hardly have NH₃ emissions, the extremely high engine-out NO_x emissions restricted its further application.

Abstract Image

查看原文本刊更多论文

求助全文

约1分钟内获得全文求助全文

来源期刊

Journal of Hazardous Materials 工程技术-工程：环境

CiteScore

25.40

自引率

5.90%

发文量

3059

审稿时长

58 days

期刊介绍： The Journal of Hazardous Materials serves as a global platform for promoting cutting-edge research in the field of Environmental Science and Engineering. Our publication features a wide range of articles, including full-length research papers, review articles, and perspectives, with the aim of enhancing our understanding of the dangers and risks associated with various materials concerning public health and the environment. It is important to note that the term "environmental contaminants" refers specifically to substances that pose hazardous effects through contamination, while excluding those that do not have such impacts on the environment or human health. Moreover, we emphasize the distinction between wastes and hazardous materials in order to provide further clarity on the scope of the journal. We have a keen interest in exploring specific compounds and microbial agents that have adverse effects on the environment.