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Luo J, Xu S, Xu H, Zhang Z, Chen X, Li M, Tie Y, Zhang H, Chen G, Jiang C. Overview of mechanisms of Fe-based catalysts for the selective catalytic reduction of NO x with NH 3 at low temperature. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:14424-14465. [PMID: 38291211 DOI: 10.1007/s11356-024-32113-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Accepted: 01/17/2024] [Indexed: 02/01/2024]
Abstract
With the increasingly stringent control of NOx emissions, NH3-SCR, one of the most effective de-NOx technologies for removing NOx, has been widely employed to eliminate NOx from automobile exhaust and industrial production. Researchers have favored iron-based catalysts for their low cost, high activity, and excellent de-NOx performance. This paper takes a new perspective to review the research progress of iron-based catalysts. The influence of the chemical form of single iron-based catalysts on their performance was investigated. In the section on composite iron-based catalysts, detailed reviews were conducted on the effects of synergistic interactions between iron and other elements on catalytic performance. Regarding loaded iron-based catalysts, the catalytic performance of iron-based catalysts on different carriers was systematically examined. In the section on iron-based catalysts with novel structures, the effects of the morphology and crystallinity of nanomaterials on catalytic performance were analyzed. Additionally, the reaction mechanism and poisoning mechanism of iron-based catalysts were elucidated. In conclusion, the paper delved into the prospects and future directions of iron-based catalysts, aiming to provide ideas for the development of iron-based catalysts with better application prospects. The comprehensive review underscores the significance of iron-based catalysts in the realm of de-NOx technologies, shedding light on their diverse forms and applications. The hope is that this paper will serve as a valuable resource, guiding future endeavors in the development of advanced iron-based catalysts.
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Affiliation(s)
- Jianbin Luo
- School of Mechanical and Automotive Engineering, Guangxi University of Science and Technology, Liuzhou, 545006, China
- Institute of the New Energy and Energy-Saving & Emission-Reduction, Guangxi University of Science and Technology, Liuzhou, 545006, China
| | - Song Xu
- School of Mechanical and Automotive Engineering, Guangxi University of Science and Technology, Liuzhou, 545006, China
- Institute of the New Energy and Energy-Saving & Emission-Reduction, Guangxi University of Science and Technology, Liuzhou, 545006, China
| | - Hongxiang Xu
- School of Mechanical and Automotive Engineering, Guangxi University of Science and Technology, Liuzhou, 545006, China
- Institute of the New Energy and Energy-Saving & Emission-Reduction, Guangxi University of Science and Technology, Liuzhou, 545006, China
| | - Zhiqing Zhang
- School of Mechanical and Automotive Engineering, Guangxi University of Science and Technology, Liuzhou, 545006, China.
- Institute of the New Energy and Energy-Saving & Emission-Reduction, Guangxi University of Science and Technology, Liuzhou, 545006, China.
| | - Xiaofeng Chen
- Guangxi Automobile Group Co., Ltd, Liuzhou, 545007, China
| | - Mingsen Li
- School of Mechanical and Automotive Engineering, Guangxi University of Science and Technology, Liuzhou, 545006, China
- Institute of the New Energy and Energy-Saving & Emission-Reduction, Guangxi University of Science and Technology, Liuzhou, 545006, China
| | - Yuanhao Tie
- School of Mechanical and Automotive Engineering, Guangxi University of Science and Technology, Liuzhou, 545006, China
- Institute of the New Energy and Energy-Saving & Emission-Reduction, Guangxi University of Science and Technology, Liuzhou, 545006, China
| | - Haiguo Zhang
- School of Mechanical and Automotive Engineering, Guangxi University of Science and Technology, Liuzhou, 545006, China
- Institute of the New Energy and Energy-Saving & Emission-Reduction, Guangxi University of Science and Technology, Liuzhou, 545006, China
| | - Guiguang Chen
- School of Mechanical and Automotive Engineering, Guangxi University of Science and Technology, Liuzhou, 545006, China
- Institute of the New Energy and Energy-Saving & Emission-Reduction, Guangxi University of Science and Technology, Liuzhou, 545006, China
| | - Chunmei Jiang
- Institute of the New Energy and Energy-Saving & Emission-Reduction, Guangxi University of Science and Technology, Liuzhou, 545006, China
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Luo L, Huang B, Shi Z, Wen Z, Li W, Zi G, Yang L. CO + NH 3 coupling denitration at low temperatures over manganese/activated carbon catalysts. RSC Adv 2022; 12:34236-34244. [PMID: 36545625 PMCID: PMC9709521 DOI: 10.1039/d2ra06429d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2022] [Accepted: 11/23/2022] [Indexed: 12/03/2022] Open
Abstract
To explore the mechanism of low-temperature carbon monoxide and ammonia (CO + NH3) coupling denitration of manganese/activated carbon (Mn/AC) catalysts, Mn/AC series catalysts were prepared using the impregnation method with AC activated by nitric acid as a precursor and manganese nitrate as a precursor. We characterized the surface morphology, pore structure, active component phase, functional group, and active component valence change law of the Mn/AC catalyst. The denitration rate order with different Mn loadings is 7Mn/AC > 9Mn/AC > 5Mn/AC. When the Mn loading was 7%, the catalyst's surface was smooth, with a good pore structure and uniform surface distribution of metal particles. These features increased the reacting gas's contact area, improving the denitration rate. The reason for this was oxygen chemisorption on the catalyst's surface. The Mn4+ and the number of oxygen-containing functional groups on the catalyst surface increase after Mn loading increases; this provides more active sites for denitration and promotes the reaction's conversion to fast selective catalytic reduction. The low-temperature CO + NH3 coupling denitration of Mn/AC catalysts conforms to the Langmuir-Hinshelwood mechanism when the temperature is lower than 230 °C and the Eley-Rideal mechanism when the temperature is higher than 230 °C. The research results can provide new ideas for low-temperature flue gas denitration.
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Affiliation(s)
- Liubin Luo
- Faculty of Metallurgical and Energy Engineering, Kunming University of Science and TechnologyKunming650093China,Clean Metallurgy Key Laboratory of Complex Iron Resources, University of Yunnan ProvinceKunming 650093China
| | - Bangfu Huang
- Faculty of Metallurgical and Energy Engineering, Kunming University of Science and TechnologyKunming650093China,Clean Metallurgy Key Laboratory of Complex Iron Resources, University of Yunnan ProvinceKunming 650093China
| | - Zhe Shi
- Faculty of Metallurgical and Energy Engineering, Kunming University of Science and TechnologyKunming650093China,Clean Metallurgy Key Laboratory of Complex Iron Resources, University of Yunnan ProvinceKunming 650093China
| | - Zhenjing Wen
- Faculty of Metallurgical and Energy Engineering, Kunming University of Science and TechnologyKunming650093China,Clean Metallurgy Key Laboratory of Complex Iron Resources, University of Yunnan ProvinceKunming 650093China
| | - Wanjun Li
- Faculty of Metallurgical and Energy Engineering, Kunming University of Science and TechnologyKunming650093China,Clean Metallurgy Key Laboratory of Complex Iron Resources, University of Yunnan ProvinceKunming 650093China
| | - Gaoyong Zi
- Faculty of Metallurgical and Energy Engineering, Kunming University of Science and TechnologyKunming650093China,Clean Metallurgy Key Laboratory of Complex Iron Resources, University of Yunnan ProvinceKunming 650093China
| | - Linjing Yang
- Faculty of Metallurgical and Energy Engineering, Kunming University of Science and TechnologyKunming650093China
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Phosphotungstic Acid-Modified MnOx for Selective Catalytic Reduction of NOx with NH3. Catalysts 2022. [DOI: 10.3390/catal12101248] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
H3PW12O40-modified MnOx catalysts (denoted as Mn-HPW) were used for NOx elimination with co-fed NH3. The optimal Mn-HPW0.02 catalyst exhibited over 90% NOx conversion at 90–270 °C. The incorporation of HPW increased the amount of Lewis acid sites of the catalyst for adsorbing NH3, and accelerated the reaction between the adsorbed NH3 species and gas-phase NOx, thus, increasing the low-temperature catalytic activity. The oxidation ability of the Mn catalyst was decreased due to the addition of HPW, thus, mitigating the overoxidation of the adsorbed NH3 species and improving the de-NOx activity and N2 selectivity in the high-temperature region. DRIFT results revealed that the NH3 species on Lewis and Brønsted acid sites, bridged nitrate, and bidentate nitrate were important species/intermediates for the reaction. NH3-SCR over the Mn and Mn-HPW0.02 catalysts obeyed the Eley–Rideal and Langmuir–Hinshelwood mechanisms, simultaneously, at 120 °C.
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Wang S, Li X, Ren S, Xing X, Chen L, Yang J, Liu M, Xie Y. Effects of different exposed crystal surfaces of CeO 2 loaded on an MnO 2/X catalyst for the NH 3-SCR reaction. CrystEngComm 2022. [DOI: 10.1039/d2ce00570k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
To study the effects of the loading of different exposed crystal surfaces of CeO2 on an MnO2/X catalyst for the NH3-selective catalytic reduction (SCR) reaction, Mn/X, Mn–CeNP/X, Mn–CeNC/X and Mn–CeNR/X catalysts were synthesized via a solid-state diffusion method.
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Affiliation(s)
- Shihao Wang
- College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
| | - Xiaodi Li
- College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
| | - Shan Ren
- College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
| | - Xiangdong Xing
- School of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, ShanXi, P.R. China
| | - Lin Chen
- College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
| | - Jie Yang
- College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
- Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - Manyi Liu
- College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
| | - Yixin Xie
- College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
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Xing Y, Guo Z, Su W, Zhang H, Chen J, Tian J, Yuan J, Di Wu. Vanadium-bearing steel slag catalysts for the selective catalytic reduction of NO x by NH 3. NEW J CHEM 2022. [DOI: 10.1039/d2nj02419e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this paper, denitration catalysts were prepared by different modification methods using vanadium-bearing steel slag as raw material.
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Affiliation(s)
- Yi Xing
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
- Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing 100083, China
| | - Zefeng Guo
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Wei Su
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
- Key Laboratory of Knowledge Automation for Industrial Processes, Ministry of Education, Beijing 100083, China
| | - Hui Zhang
- Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
| | - Jing Chen
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Jinglei Tian
- HBIS Group Research Institute, Shijiazhuang 050000, China
| | - Jichao Yuan
- Environmental Protection Department, HBIS Group Chengsteel Company, Chengde 067102, China
| | - Di Wu
- Iron Making Department, HBIS Group Chengsteel Company, Chengde 067002, China
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