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Core-shell structured Fe 2O 3/CeO 2@MnO 2 microspheres with abundant surface oxygen for sensitive solid-phase microextraction of polycyclic aromatic hydrocarbons from water. Mikrochim Acta 2021; 188:337. [PMID: 34510313 DOI: 10.1007/s00604-021-05004-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Accepted: 08/24/2021] [Indexed: 12/14/2022]
Abstract
Core-shell structured Fe2O3/CeO2@MnO2 microspheres were fabricated and used as solid-phase microextraction coating for determination of polycyclic aromatic hydrocarbons (PAHs) in water samples. XPS spectra demonstrated the generation of abundant surface oxygen on Fe2O3/CeO2@MnO2 microspheres, which provided binding sites for enhancement of analyte extraction. Under optimized conditions, the proposed method presented good linearity in the concentration range 0.04-100 ng mL-1, with low limits of detection varying from 0.38 to 3.57 ng L-1 for eight PAHs. Relative standard deviations for a single fiber and five batches of fibers were in the ranges of 4.1-8.2% and 7.1-11.4%, respectively. The proposed method was successfully used for determination of PAHs in real river water samples with recoveries ranging from 87.1 to 115.9%. The proposed method using as-prepared Fe2O3/CeO2@MnO2 microspheres as SPME coating exhibit significant potential for real sample analysis due to its excellent reproducibility, high sensitivity, and good linearity.
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2
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Xu G, Guo X, Cheng X, Yu J, Fang B. A review of Mn-based catalysts for low-temperature NH 3-SCR: NO x removal and H 2O/SO 2 resistance. NANOSCALE 2021; 13:7052-7080. [PMID: 33889905 DOI: 10.1039/d1nr00248a] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
The development of high-efficiency catalysts is the key to the low-temperature NH3-SCR technology. The introduction of SO2 and H2O will lead to poisoning and deactivation of the catalysts, which severely limits the development and application of NH3-SCR technology. This review introduces the necessity of NOx removal, explains the mechanisms of H2O and SO2 poisoning on NH3-SCR catalysts, highlights the Mn-based catalysts of different active metals and supports and their resistance to H2O and SO2, and analyses the relationship between metal modification, selection of support and preparation method, morphology and structure design and SO2/H2O resistance. Given the current problems, this review points out the future research focus of Mn-based catalysts and also puts forward corresponding countermeasures to solve the existing problems.
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Affiliation(s)
- Guiying Xu
- College of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 400054, China
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3
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Low temperature selective catalytic reduction of NOx by NH3 over Cu modified V2O5/TiO2–carbon nanotube catalyst. REACTION KINETICS MECHANISMS AND CATALYSIS 2020. [DOI: 10.1007/s11144-020-01735-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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4
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Raja S, Alphin MS, Sivachandiran L. Promotional effects of modified TiO2- and carbon-supported V2O5- and MnOx-based catalysts for the selective catalytic reduction of NOx: a review. Catal Sci Technol 2020. [DOI: 10.1039/d0cy01348j] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
This review presents the promotional effects of transition metal modification over TiO2- and carbon-supported V2O5- and MnOx-based SCR catalysts.
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Affiliation(s)
- S. Raja
- Department of Mechanical Engineering
- Sri Sivasubramaniya Nadar College of Engineering
- Kalavakkam 603110
- India
| | - M. S. Alphin
- Department of Mechanical Engineering
- Sri Sivasubramaniya Nadar College of Engineering
- Kalavakkam 603110
- India
| | - L. Sivachandiran
- Department of chemistry
- SRM Institute of Science and Technology
- Chennai
- India
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5
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Low-Temperature Selective Catalytic Reduction of NO with NH3 over Natural Iron Ore Catalyst. Catalysts 2019. [DOI: 10.3390/catal9110956] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The selective catalytic reduction of NO with NH3 at low temperatures has been investigated with natural iron ore catalysts. Four iron ore raw materials from different locations were taken and processed to be used as catalysts. The methods of X-ray diffraction (XRD), X-ray fluorescence (XRF), Brunauer-Emmett-Teller (BET), X-ray photoelectron spectroscopy (XPS), hydrogen temperature-programmed reduction (H2-TPR), ammonia temperature-programmed desorption (NH3-TPD), scanning electron microscopy (SEM) and Fourier-transform infrared spectroscopy (FTIR) were used to characterize the materials. The results showed that the sample A (comprised mainly of α-Fe2O3 and γ-Fe2O3), calcined at 250 °C, achieved excellent selective catalytic reduction (SCR) activity (above 80% at 170–350 °C) and N2 selectivity (above 90% up to 250 °C) at low temperatures. Suitable calcination temperature, large surface area, high concentration of surface-adsorbed oxygen, good reducibility, lots of acid sites and adsorption of the reactants were responsible for the excellent SCR performance of the iron ore. However, the addition of H2O and SO2 in the feed gas showed some adverse effects on the SCR activity. The FT-IR analysis indicated the formation of sulfate salts on the surface of the catalyst during the SCR reaction in the presence of SO2, which could cause pore plugging and result in the suppression of the catalytic activity.
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6
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Zhang Y, Liu L, Chen Y, Cheng X, Song C, Ding M, Zhao H. Synthesis of MnO 2-CuO-Fe 2O 3/CNTs catalysts: low-temperature SCR activity and formation mechanism. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2019; 10:848-855. [PMID: 31019872 PMCID: PMC6466767 DOI: 10.3762/bjnano.10.85] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/10/2019] [Accepted: 03/29/2019] [Indexed: 06/09/2023]
Abstract
MnO2-CuO-Fe2O3/CNTs catalysts, as a low-dimensional material, were fabricated by a mild redox strategy and used in denitration reactions. A formation mechanism of the catalysts was proposed. NO conversions of 4% MnO2-CuO-Fe2O3/CNTs catalyst of 43.1-87.9% at 80-180 °C were achieved, which was ascribed to the generation of amorphous MnO2, CuO and Fe2O3, and a high surface-oxygen (Os) content.
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Affiliation(s)
- Yanbing Zhang
- College of Materials and Chemical Engineering, Henan University of Urban Construction, Pingdingshan 467000, People′s Republic of China
- Engineering Laboratory of Henan Province for Efficient Utilization of Coal Salt Resources, Pingdingshan 467000, People′s Republic of China
| | - Lihua Liu
- College of Materials and Chemical Engineering, Henan University of Urban Construction, Pingdingshan 467000, People′s Republic of China
- Engineering Laboratory of Henan Province for Efficient Utilization of Coal Salt Resources, Pingdingshan 467000, People′s Republic of China
| | - Yingzan Chen
- College of Materials and Chemical Engineering, Henan University of Urban Construction, Pingdingshan 467000, People′s Republic of China
- Engineering Laboratory of Henan Province for Efficient Utilization of Coal Salt Resources, Pingdingshan 467000, People′s Republic of China
| | - Xianglong Cheng
- College of Materials and Chemical Engineering, Henan University of Urban Construction, Pingdingshan 467000, People′s Republic of China
- Engineering Laboratory of Henan Province for Efficient Utilization of Coal Salt Resources, Pingdingshan 467000, People′s Republic of China
| | - Chengjian Song
- College of Materials and Chemical Engineering, Henan University of Urban Construction, Pingdingshan 467000, People′s Republic of China
- Engineering Laboratory of Henan Province for Efficient Utilization of Coal Salt Resources, Pingdingshan 467000, People′s Republic of China
| | - Mingjie Ding
- College of Materials and Chemical Engineering, Henan University of Urban Construction, Pingdingshan 467000, People′s Republic of China
- Engineering Laboratory of Henan Province for Efficient Utilization of Coal Salt Resources, Pingdingshan 467000, People′s Republic of China
| | - Haipeng Zhao
- College of Materials and Chemical Engineering, Henan University of Urban Construction, Pingdingshan 467000, People′s Republic of China
- Engineering Laboratory of Henan Province for Efficient Utilization of Coal Salt Resources, Pingdingshan 467000, People′s Republic of China
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Jin Q, Shen Y, Sui G, Tao X, Pan Y, Zhu S. Synergistic catalytic removals of NO, CO and HC over CeO 2 modified Mn-Mo-W-O x /TiO 2 -SiO 2 catalyst. J RARE EARTH 2018. [DOI: 10.1016/j.jre.2017.07.014] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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8
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Husnain N, Wang E, Li K, Anwar MT, Mehmood A, Gul M, Li D, Mao J. Iron oxide-based catalysts for low-temperature selective catalytic reduction of NO
x
with NH3. REV CHEM ENG 2018. [DOI: 10.1515/revce-2017-0064] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Selective catalytic reduction (SCR) is now an established NO
x
removal technology for industrial flue gas as well as for diesel engine exhaust gas. However, it is still a big challenge to develop a novel low-temperature catalyst for NH3-SCR of NO
x
, especially at a temperature below 200°C. In the past few years, many studies have demonstrated the potential of iron (Fe)-based catalysts as low-temperature catalysts for NH3-SCR of NO
x
. Herein, we summarize the recent progress and performance of Fe-based catalysts for low-temperature NH3-SCR of NO
x
. Catalysts are divided into three categories: single Fe
x
O
y
, Fe-based multimetal oxide, and Fe-based multimetal oxide with support catalysts. The catalytic activity and selectivity of Fe-based catalysts are systematically analyzed and summarized in light of some key factors such as activation energy, specific surface area, morphology, crystallinity, preparation method and precursor, acid sites, calcination temperature, other metal dopant/substitute, and redox property of catalysts. In addition, H2O/SO2 tolerance and the NH3-SCR reaction mechanism over Fe-based catalysts, including Eley-Rideal and Langmuir-Hinshelwood mechanism, are emphasized. Lastly, the perspectives and future research directions of low-temperature NH3-SCR of NO
x
are also proposed.
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Affiliation(s)
- Naveed Husnain
- School of Mechanical Engineering , Shanghai Jiao Tong University , Shanghai 200240 , China
- Department of Mechanical Engineering , Bahauddin Zakariya University , Multan 60800 , Pakistan
| | - Enlu Wang
- School of Mechanical Engineering , Shanghai Jiao Tong University , Shanghai 200240 , China
| | - Kai Li
- School of Mechanical Engineering , Shanghai Jiao Tong University , Shanghai 200240 , China
| | - Muhammad Tuoqeer Anwar
- School of Mechanical Engineering , Shanghai Jiao Tong University , Shanghai 200240 , China
| | - Aamir Mehmood
- Department of Mechanical Engineering , University of Engineering and Technology Lahore (FSD Campus) , Faisalabad 38000 , Pakistan
| | - Mustabshirha Gul
- Department of Mechanical Engineering , Bahauddin Zakariya University , Multan 60800 , Pakistan
| | - Deli Li
- School of Mechanical Engineering , Shanghai Jiao Tong University , Shanghai 200240 , China
| | - Jinda Mao
- School of Mechanical Engineering , Shanghai Jiao Tong University , Shanghai 200240 , China
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Zhang Y, Ding M, Song C, Lv Y, Zhao H. Selective catalytic reduction of NO with NH 3 over MnO 2/PDOPA@CNT catalysts prepared via poly(dopamine) functionalization. NEW J CHEM 2018. [DOI: 10.1039/c8nj02269k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
MnO2/PDOPA@CNT catalysts were for the first time prepared via poly(dopamine) functionalization and applied in low-temperature NO reduction with NH3.
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Affiliation(s)
- Yanbing Zhang
- College of Materials and Chemical Engineering
- Henan University of Urban Construction
- Pingdingshan 467000
- People's Republic of China
| | - Mingjie Ding
- College of Materials and Chemical Engineering
- Henan University of Urban Construction
- Pingdingshan 467000
- People's Republic of China
| | - Chengjian Song
- College of Materials and Chemical Engineering
- Henan University of Urban Construction
- Pingdingshan 467000
- People's Republic of China
| | - Yingjie Lv
- Henan Vocational College of Applied Technology
- Zhengzhou 450000
- People's Republic of China
| | - Haipeng Zhao
- College of Materials and Chemical Engineering
- Henan University of Urban Construction
- Pingdingshan 467000
- People's Republic of China
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10
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Zhu B, Yin S, Sun Y, Zhu Z, Li J. Natural manganese ore catalyst for low-temperature selective catalytic reduction of NO with NH 3 in coke-oven flue gas. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:24584-24592. [PMID: 28913690 DOI: 10.1007/s11356-017-0122-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2017] [Accepted: 09/05/2017] [Indexed: 06/07/2023]
Abstract
Different types of manganese ore raw materials were prepared for use as catalysts, and the effects of different manganese ore raw materials and calcination temperature on the NO conversion were analyzed. The catalysts were characterized by XRF, XRD, BET, XPS, H2-TPR, NH3-TPD, and SEM techniques. The results showed that the NO conversion of calcined manganese ore with a Mn:Fe:Al:Si ratio of 1.51:1.26:0.34:1 at 450 °C reached 80% at 120 °C and 98% at 180~240 °C. The suitable proportions and better dispersibility of active ingredients, larger BET surface area, good reductibility, a lot of acid sites, contents of Mn4+ and Fe3+, and surface-adsorbed oxygen played important roles in improving the NO conversion.
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Affiliation(s)
- Baozhong Zhu
- School of Energy and Environment, Anhui University of Technology, Maanshan, 243002, Anhui, People's Republic of China
| | - Shoulai Yin
- School of Energy and Environment, Anhui University of Technology, Maanshan, 243002, Anhui, People's Republic of China
| | - Yunlan Sun
- School of Energy and Environment, Anhui University of Technology, Maanshan, 243002, Anhui, People's Republic of China.
- Key Laboratory of Metallurgical Emission Reduction and Resources Recycling, Ministry of Education, Anhui University of Technology, Maanshan, 243002, Anhui, People's Republic of China.
| | - Zicheng Zhu
- School of Energy and Environment, Anhui University of Technology, Maanshan, 243002, Anhui, People's Republic of China
| | - Jiaxin Li
- School of Energy and Environment, Anhui University of Technology, Maanshan, 243002, Anhui, People's Republic of China
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11
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Metal-organic framework loaded manganese oxides as efficient catalysts for low-temperature selective catalytic reduction of NO with NH3. Front Chem Sci Eng 2017. [DOI: 10.1007/s11705-017-1668-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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12
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A Review on Selective Catalytic Reduction of NOx by NH3 over Mn–Based Catalysts at Low Temperatures: Catalysts, Mechanisms, Kinetics and DFT Calculations. Catalysts 2017. [DOI: 10.3390/catal7070199] [Citation(s) in RCA: 126] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
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13
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Kozhina G, Estemirova S, Pechishcheva N, Murzakaev A, Vovkotrub E, Skrylnik M, Shunyaev K. Joint mechanical activation of MnO 2 , Fe 2 O 3 and graphite: Mutual influence on the structure. ADV POWDER TECHNOL 2017. [DOI: 10.1016/j.apt.2017.02.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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