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J. Hefei Univ. Tech. (Nat. Sci.)

合肥工业大学学报(自然科学版)

JOURNAL OF HEFEI UNIVERSITY OF TECHNOLOGY (NATURAL SCIENCE)

Competent Authorities: Ministry of Education of the People's Republic of China

Sponsor by: Hefei University of Technology

ISSN 1000-1646, CN 34-1001/N

Study on the characteristics of ignition and secondary pollutants generation of aged Pd/Rh three-way catalytic converter

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老化态 Pd/Rh 基三元催化器的起燃及次生污染物生成特性研究

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Jun.2023, Vol.46 No.6: 738-742, 752

DOI: 10.3969/j.issn.1003-5060.2023.06.004

Authors

WANG Zhaoyuan, QIAN Yejian, MENG Shun, WEI Xiaofei, XIE Zhaohui, PAN Tao

(School of Automobile and Traffic Engineering, Hefei University of Technology, Hefei 230009, China)

Abstract and Keywords

Abstract: In order to explore the influence of long-term use on the ignition and secondary pollutants generation of the three-way catalytic converter (TWC) for a stoichiometric natural gas engine, a surface reaction mechanism model of Pd/Rh catalytic converter in natural gas engine with equivalent ratio combustion was established, and the accuracy of the model was verified by experimental data. The influence of precious metal dispersion on the ignition characteristics of $ CH_{4} $, CO and NO emissions and the generation of secondary pollutants $ NH_{3} $ and $ N_{2}O $ was studied. The results show that, compared with the fresh catalytic converter, although the aged catalytic converter can still achieve effective conversion of gas emissions, the ignition temperatures of $ CH_{4} $, CO and NO increase obviously and the characteristics of ignition become worse with the decrease of precious metal dispersion. The dispersion of precious metal can affect the generation rule of secondary pollutants, with the increase of dispersion, the adsorption capacity of the catalyst surface to pollutant gas enhances, which can effectively increase the consumption of secondary pollutants and reduce the generation of secondary pollutants.

Keywords: natural gas engine; aged state; precious metal dispersion; ignition characteristic; secondary pollutant

作者信息

王朝元，钱叶剑，孟顺，位晓飞，谢兆辉，潘涛

（合肥工业大学汽车与交通工程学院，安徽合肥230009）

摘要和关键词

摘要: 为探究天然气发动机三元催化器(three-way catalytic converter, TWC)长期使用后起燃特性及次生污染物生成特性的变化规律,文章建立当量比燃烧的天然气发动机Pd/Rh基催化器的表面反应机理模型,利用试验数据验证模型的准确性,研究贵金属分散度对 $ CH_{4} $、CO、NO排放物起燃特性以及次生污染物 $ NH_{3} $、 $ N_{2}O $生成规律的影响。结果表明:相较于新鲜催化器,老化催化器虽然仍能实现对气体排放物的有效转化,但是随着贵金属分散度的降低, $ CH_{4} $、CO、NO的起燃温度明显增加,起燃特性变差;贵金属分散度还会影响次生污染物的生成规律,分散度增加时,催化剂表面对污染物气体的吸附能力增强,增加了次生污染物的消耗,次生污染物的生成有所减少。

关键词: 天然气发动机；老化；贵金属分散度；起燃性能；次生污染物

Funding

国家自然科学基金资助项目（51676062）

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