In-situ impedance-infrared spectroscopy reveals the role of Br?nsted acid sites in NO reduction during high-concentration NH3 combustion
文献类型：期刊论文
| 作者 | Zhang CH(张晨航)1,3; Dou, Baojuan2; Wei XL(魏小林)3; Kang RN(康润宁)1,3; Liang, Wenjun1; Bin F(宾峰)3 |
| 刊名 | JOURNAL OF HAZARDOUS MATERIALS
 |
| 出版日期 | 2025-09-15 |
| 卷号 | 496页码:10 |
| 关键词 | NH 3 catalytic combustion NO x reduction In-situ impedance spectroscopy Isotopic tracing |
| ISSN号 | 0304-3894 |
| DOI | 10.1016/j.jhazmat.2025.139226 |
| 通讯作者 | Liang, Wenjun(liangwenj@bjut.edu.cn) ; Bin, Feng(binfeng@imech.ac.cn) |
| 英文摘要 | The utilization of carbon-free NH3 gas can be extended from low-concentration environmental applications to high-concentration energy applications. To achieve this, minimizing NO formation while maximizing energy release is essential. In this study, we investigated the catalytic performance of catalysts with different acid site characteristics, including a non-acidic catalyst, CuO-CeO2 supported on TiO2 providing only Lewis acid (LA) sites, and a catalyst with both Br & Oslash;nsted acid (BA) and LA sites at the same active sites. These catalysts were used to examine the synergistic effects of BA and LA sites in NH3 catalytic combustion. Results show that proton transfer at BA sites, where H+ protonates NH3 to form NH+4, stabilizes NH3, reducing reactive NHx intermediates and enhancing NO reduction efficiency by interacting with N2O.In-situ impedance spectroscopy and diffuse reflectance infrared spectroscopy reveal that NH+4 formed on BA sites migrates, interacting with reductive NO species to prevent nitrate decomposition and limit NHx formation. The 18O2 isotope tracing of O species in NO reveals that NH+4 promotes NO conversion to N2 via an internal selective catalytic reduction (i-SCR) mechanism, maintaining NO concentrations below 50 ppm at temperatures below 550 degrees C. Based on this specially designed catalyst, the combination of advanced in-situ analytical techniques and isotopic tracing highlights a crucial pathway for NH+4-mediated NOx reduction at acidic sites. The utilization of carbon-free NH3 gas can be extended from low-concentration environmental applications to high-concentration energy applications, requiring minimized NO formation alongside maximized energy release. |
| 分类号 | 一类 |
| WOS关键词 | SELECTIVE CATALYTIC-REDUCTION ; HYDROTHERMAL STABILITY ; NH3-SCR ; MECHANISM ; ZEOLITE ; AMMONIA ; PERFORMANCE ; FE-ZSM-5 ; OXIDES ; SCR |
| 资助项目 | National Natural Science Foundation of China[52176142] ; National Natural Science Foundation of China[52406171] ; Key Technologies Research and Development Program of Tianjin[23YFYSHZ00100] |
| WOS研究方向 | Engineering ; Environmental Sciences & Ecology |
| 语种 | 英语 |
| WOS记录号 | WOS:001534741600005 |
| 资助机构 | National Natural Science Foundation of China ; Key Technologies Research and Development Program of Tianjin |
| 其他责任者 | Liang, Wenjun，宾峰 |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/102310]  |
| 专题 | 力学研究所_高温气体动力学国家重点实验室 |
| 作者单位 | 1.Beijing Univ Technol, Key Lab Beijing Reg Air Pollut Control, Beijing 100124, Peoples R China; 2.Tianjin Univ Sci & Technol, Coll Marine & Environm Sci, Tianjin 300457, Peoples R China 3.Chinese Acad Sci, State Key Lab High Temp Gas Dynam, Inst Mech, Beijing 100190, Peoples R China; |
| 推荐引用方式 GB/T 7714 | Zhang CH,Dou, Baojuan,Wei XL,et al. In-situ impedance-infrared spectroscopy reveals the role of Br?nsted acid sites in NO reduction during high-concentration NH3 combustion[J]. JOURNAL OF HAZARDOUS MATERIALS,2025,496:10. |
| APA | 张晨航,Dou, Baojuan,魏小林,康润宁,Liang, Wenjun,&宾峰.(2025).In-situ impedance-infrared spectroscopy reveals the role of Br?nsted acid sites in NO reduction during high-concentration NH3 combustion.JOURNAL OF HAZARDOUS MATERIALS,496,10. |
| MLA | 张晨航,et al."In-situ impedance-infrared spectroscopy reveals the role of Br?nsted acid sites in NO reduction during high-concentration NH3 combustion".JOURNAL OF HAZARDOUS MATERIALS 496(2025):10. |
入库方式： OAI收割
来源：力学研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。