{"title":"C3H6、SO2和温度对非热等离子体促进NH3-SCR混合反应器系统减少柴油机尾气NOx排放的影响","authors":"Bin Guan, Junyan Chen, Zhongqi Zhuang, Lei Zhu, Zeren Ma, Xuehan Hu, Chenyu Zhu, Sikai Zhao, Kaiyou Shu, Hongtao Dang, Junjie Gao, Luyang Zhang, Tiankui Zhu, Zhen Huang","doi":"10.1021/acs.iecr.4c04103","DOIUrl":null,"url":null,"abstract":"An extensive series of experiments have been conducted to investigate the effects of C<sub>3</sub>H<sub>6</sub>, SO<sub>2</sub>, temperatures, and their combination on the comprehensive performance of the plasma-facilitated NH<sub>3</sub>–SCR hybrid reactor (PFSHR) system. The addition of C<sub>3</sub>H<sub>6</sub> drastically changes the pathway of NO oxidation in the process of dielectric barrier discharge (DBD), which can efficiently promote the oxidation of NO to NO<sub>2</sub>, making it easier to achieve the fast SCR reaction and thus significantly improve the NO<i><sub>x</sub></i> reduction at lower temperatures. In addition, the oxidation rate of NO to NO<sub>2</sub> is much higher than that of SO<sub>2</sub> to SO<sub>3</sub> due to the strong selective oxidation of DBD, which is one of the most important factors attributing to the robust resistance to SO<sub>2</sub> poisoning and the durability of the PFSHR system. Besides, SO<sub>2</sub> has some inhibiting effects on the activity of the PFSHR system at low temperatures below 250 °C, while the NO<i><sub>x</sub></i> removal efficiency can be facilitated to a certain extent at medium to high temperatures. Moreover, the NO<i><sub>x</sub></i> abatement efficiency of the PFSHR system is remarkably influenced by the SIED below 250 °C, and the change of NO<i><sub>x</sub></i> reduction is relatively flat above 250 °C, which indicates that it is efficient for the DBD-assisted SCR to reduce NO<i><sub>x</sub></i> at low temperatures. Additionally, the efficiency of NO oxidation to NO<sub>2</sub> and the C<sub>3</sub>H<sub>6</sub> decomposition rate drops with the increase of the DBD reactor temperature, which, however, does not affect the NO<i><sub>x</sub></i> reduction at high temperatures. Furthermore, some regulated byproducts, N<sub>2</sub>O and CO, and unregulated byproducts, HCHO and CH<sub>3</sub>CHO, generated in the PFSHR system, from which HCHO and CH<sub>3</sub>CHO can efficiently participate in the SCR reactions and further enhance the NO<i><sub>x</sub></i> removal efficiency, result in only a small amount of HCHO and CH<sub>3</sub>CHO residue at the outlet of the PFSHR system.","PeriodicalId":39,"journal":{"name":"Industrial & Engineering Chemistry Research","volume":"48 1","pages":""},"PeriodicalIF":3.9000,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Effects of C3H6, SO2, and Temperatures on the Nonthermal Plasma-Facilitated NH3–SCR Hybrid Reactor System to Reduce NOx from Diesel Engine Exhaust\",\"authors\":\"Bin Guan, Junyan Chen, Zhongqi Zhuang, Lei Zhu, Zeren Ma, Xuehan Hu, Chenyu Zhu, Sikai Zhao, Kaiyou Shu, Hongtao Dang, Junjie Gao, Luyang Zhang, Tiankui Zhu, Zhen Huang\",\"doi\":\"10.1021/acs.iecr.4c04103\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"An extensive series of experiments have been conducted to investigate the effects of C<sub>3</sub>H<sub>6</sub>, SO<sub>2</sub>, temperatures, and their combination on the comprehensive performance of the plasma-facilitated NH<sub>3</sub>–SCR hybrid reactor (PFSHR) system. The addition of C<sub>3</sub>H<sub>6</sub> drastically changes the pathway of NO oxidation in the process of dielectric barrier discharge (DBD), which can efficiently promote the oxidation of NO to NO<sub>2</sub>, making it easier to achieve the fast SCR reaction and thus significantly improve the NO<i><sub>x</sub></i> reduction at lower temperatures. In addition, the oxidation rate of NO to NO<sub>2</sub> is much higher than that of SO<sub>2</sub> to SO<sub>3</sub> due to the strong selective oxidation of DBD, which is one of the most important factors attributing to the robust resistance to SO<sub>2</sub> poisoning and the durability of the PFSHR system. Besides, SO<sub>2</sub> has some inhibiting effects on the activity of the PFSHR system at low temperatures below 250 °C, while the NO<i><sub>x</sub></i> removal efficiency can be facilitated to a certain extent at medium to high temperatures. Moreover, the NO<i><sub>x</sub></i> abatement efficiency of the PFSHR system is remarkably influenced by the SIED below 250 °C, and the change of NO<i><sub>x</sub></i> reduction is relatively flat above 250 °C, which indicates that it is efficient for the DBD-assisted SCR to reduce NO<i><sub>x</sub></i> at low temperatures. Additionally, the efficiency of NO oxidation to NO<sub>2</sub> and the C<sub>3</sub>H<sub>6</sub> decomposition rate drops with the increase of the DBD reactor temperature, which, however, does not affect the NO<i><sub>x</sub></i> reduction at high temperatures. Furthermore, some regulated byproducts, N<sub>2</sub>O and CO, and unregulated byproducts, HCHO and CH<sub>3</sub>CHO, generated in the PFSHR system, from which HCHO and CH<sub>3</sub>CHO can efficiently participate in the SCR reactions and further enhance the NO<i><sub>x</sub></i> removal efficiency, result in only a small amount of HCHO and CH<sub>3</sub>CHO residue at the outlet of the PFSHR system.\",\"PeriodicalId\":39,\"journal\":{\"name\":\"Industrial & Engineering Chemistry Research\",\"volume\":\"48 1\",\"pages\":\"\"},\"PeriodicalIF\":3.9000,\"publicationDate\":\"2025-01-07\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Industrial & Engineering Chemistry Research\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://doi.org/10.1021/acs.iecr.4c04103\",\"RegionNum\":3,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"ENGINEERING, CHEMICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Industrial & Engineering Chemistry Research","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1021/acs.iecr.4c04103","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
Effects of C3H6, SO2, and Temperatures on the Nonthermal Plasma-Facilitated NH3–SCR Hybrid Reactor System to Reduce NOx from Diesel Engine Exhaust
An extensive series of experiments have been conducted to investigate the effects of C3H6, SO2, temperatures, and their combination on the comprehensive performance of the plasma-facilitated NH3–SCR hybrid reactor (PFSHR) system. The addition of C3H6 drastically changes the pathway of NO oxidation in the process of dielectric barrier discharge (DBD), which can efficiently promote the oxidation of NO to NO2, making it easier to achieve the fast SCR reaction and thus significantly improve the NOx reduction at lower temperatures. In addition, the oxidation rate of NO to NO2 is much higher than that of SO2 to SO3 due to the strong selective oxidation of DBD, which is one of the most important factors attributing to the robust resistance to SO2 poisoning and the durability of the PFSHR system. Besides, SO2 has some inhibiting effects on the activity of the PFSHR system at low temperatures below 250 °C, while the NOx removal efficiency can be facilitated to a certain extent at medium to high temperatures. Moreover, the NOx abatement efficiency of the PFSHR system is remarkably influenced by the SIED below 250 °C, and the change of NOx reduction is relatively flat above 250 °C, which indicates that it is efficient for the DBD-assisted SCR to reduce NOx at low temperatures. Additionally, the efficiency of NO oxidation to NO2 and the C3H6 decomposition rate drops with the increase of the DBD reactor temperature, which, however, does not affect the NOx reduction at high temperatures. Furthermore, some regulated byproducts, N2O and CO, and unregulated byproducts, HCHO and CH3CHO, generated in the PFSHR system, from which HCHO and CH3CHO can efficiently participate in the SCR reactions and further enhance the NOx removal efficiency, result in only a small amount of HCHO and CH3CHO residue at the outlet of the PFSHR system.
期刊介绍:
ndustrial & Engineering Chemistry, with variations in title and format, has been published since 1909 by the American Chemical Society. Industrial & Engineering Chemistry Research is a weekly publication that reports industrial and academic research in the broad fields of applied chemistry and chemical engineering with special focus on fundamentals, processes, and products.