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Li S, Yu H, Lan T, Shi L, Cheng D, Han L, Zhang D. NOx reduction against alkali poisoning over Ce(SO4)2-V2O5/TiO2 catalysts by constructing the Ce4+–SO42− pair sites. CHINESE CHEM LETT 2023. [DOI: 10.1016/j.cclet.2023.108240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
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2
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Xu Y, Wang P, Pu Y, Jiang L, Yang L, Jiang W, Yao L. MnCe/GAC-CNTs catalyst with high activity, SO2 and H2O tolerance for low-temperature NH3-SCR. Sep Purif Technol 2023. [DOI: 10.1016/j.seppur.2022.122498] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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3
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Zhou J, Wang P, Chen A, Qu W, Zhao Y, Zhang D. NO x Reduction over Smart Catalysts with Self-Created Targeted Antipoisoning Sites. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:6668-6677. [PMID: 35500206 DOI: 10.1021/acs.est.2c00758] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Selective catalytic reduction of NOx in the presence of alkali (earth) metals and heavy metals is still a challenge due to the easy deactivation of catalysts. Herein, NOx reduction over smart catalysts with self-created targeted antipoisoning sites is originally demonstrated. The smart catalyst consisted of TiO2 pillared montmorillonite with abundant cation exchange sites to anchor poisoning substances and active components to catalyze NOx into N2. It was not deactivated during the NOx reduction process in the presence of alkali (earth) metals and heavy metals. The enhanced surface acidity, reducible active species, and active chemisorbed oxygen species of the smart catalyst accounted for the remarkable NOx reduction efficiency. More importantly, the self-created targeted antipoisoning sites expressed specific anchoring effects on poisoning substances and protected the active components from poisoning. It was demonstrated that the tetrahedrally coordinated aluminum species of the smart catalyst mainly acted as self-created targeted antipoisoning sites to stabilize the poisoning substances into the interlayers of montmorillonite. This work paves a new way for efficient reduction of NOx from the complex flue gas in practical applications.
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Affiliation(s)
- Jialun Zhou
- International Joint Laboratory of Catalytic Chemistry, College of Sciences, Shanghai University, Shanghai 200444, China
| | - Penglu Wang
- International Joint Laboratory of Catalytic Chemistry, College of Sciences, Shanghai University, Shanghai 200444, China
| | - Aling Chen
- International Joint Laboratory of Catalytic Chemistry, College of Sciences, Shanghai University, Shanghai 200444, China
| | - Wenqiang Qu
- International Joint Laboratory of Catalytic Chemistry, College of Sciences, Shanghai University, Shanghai 200444, China
| | - Yufei Zhao
- International Joint Laboratory of Catalytic Chemistry, College of Sciences, Shanghai University, Shanghai 200444, China
| | - Dengsong Zhang
- International Joint Laboratory of Catalytic Chemistry, College of Sciences, Shanghai University, Shanghai 200444, China
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Yao G, Wei Y, Gui K, Ling X. Catalytic performance and reaction mechanisms of NO removal with NH 3 at low and medium temperatures on Mn-W-Sb modified siderite catalysts. J Environ Sci (China) 2022; 115:126-139. [PMID: 34969443 DOI: 10.1016/j.jes.2021.06.029] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2021] [Revised: 06/23/2021] [Accepted: 06/24/2021] [Indexed: 06/14/2023]
Abstract
Iron-based catalysts have been explored for selective catalytic reduction (SCR) of NO due to environmentally benign characters and good SCR activity. Mn-W-Sb modified siderite catalysts were prepared by impregnation method based on siderite ore, and SCR performance of the catalysts was investigated. The catalysts were analyzed by X-ray diffraction, H2-temperature-programmed reduction, Brunauer-Emmett-Teller, Thermogravimetry-derivative thermogravimetry and in-situ diffused reflectance infrared Fourier transform spectroscopy (DRIFTS). The modified siderite catalysts calcined at 450°C mainly consist of Fe2O3, and added Mn, W and Sb species are amorphous. 3Mn-5W-1.5Sb-siderite catalyst has a wide temperature window of 180-360°C and good N2 selectivity at low temperatures. In-situ DRIFTS results show NH4+, coordinated NH3, NH2, NO3- species (bidentate), NO2- species (nitro, nitro-nitrito, monodentate), and adsorbed NO2 can be discovered on the surface of Mn-W-Sb modified siderite catalysts, and doping of Mn will enhance adsorbed NO2 formation by synergistic catalysis with Fe3+. In addition, the addition of Sb can inhibit sulfates formation on the surface of the catalyst in the presence of SO2 and H2O. Time-dependent in-situ DRIFTS studies also indicate that both of Lewis and Brønsted acid sites play a role in SCR of NO by ammonia at low temperatures. The mechanism of NO removal on the 3Mn-5W-1.5Sb-siderite catalyst can be discovered as a combination of Eley-Rideal and Langmuir-Hinshelwood mechanisms with three reaction pathways. The mechanism of NO, oxidized by synergistic catalysis of Fe3+ and Mn4+/3+ to form NO2 among three pathways, reveals the reason of high NOx conversion of the catalyst at medium and low temperatures.
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Affiliation(s)
- Guihuan Yao
- School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211816, China.
| | - Yuliang Wei
- School of Energy and Environment, Southeast University, Nanjing 210096, China
| | - Keting Gui
- School of Energy and Environment, Southeast University, Nanjing 210096, China
| | - Xiang Ling
- School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211816, China.
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Chitsazi H, Zhang N, Li L, Liu X, Wu R, He J, Song L, He H. In-situ DRIFT assessment on strengthening effect of cerium over FeO /TiO2 catalyst for selective catalytic reduction of NO with NH3. J RARE EARTH 2021. [DOI: 10.1016/j.jre.2020.05.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Youn JR, Kim MJ, Lee SJ, Ryu IS, Yoon HC, Jeong SK, Lee K, Jeon SG. The influence of CNTs addition on Mn-Ce/TiO2 catalyst for low-temperature NH3-SCR of NO. CATAL COMMUN 2021. [DOI: 10.1016/j.catcom.2021.106282] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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Mosrati J, Atia H, Eckelt R, Huyen Vuong T, Rabeah J, Mhamdi M, Armbruster U. Ta and Mo oxides supported on CeO2-TiO2 for the selective catalytic reduction of NOx with NH3 at low temperature. J Catal 2021. [DOI: 10.1016/j.jcat.2021.01.014] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Xie C, Sun Y, Zhu B, Song W, Xu M. Adsorption mechanism of NH3, NO, and O2 molecules over the FexOy/AC catalyst surface: a DFT-D3 study. NEW J CHEM 2021. [DOI: 10.1039/d0nj05628f] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The surface model of the FexOy/AC catalyst was constructed and the adsorption mechanism of gas molecules on its surface was revealed.
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Affiliation(s)
- Chaoyue Xie
- School of Petroleum Engineering
- Changzhou University
- Changzhou
- China
| | - Yunlan Sun
- School of Petroleum Engineering
- Changzhou University
- Changzhou
- China
| | - Baozhong Zhu
- School of Petroleum Engineering
- Changzhou University
- Changzhou
- China
| | - Weiyi Song
- School of Petroleum Engineering
- Changzhou University
- Changzhou
- China
| | - Minggao Xu
- Center for Advanced Combustion and Energy
- University of Science and Technology of China
- Hefei
- P. R. China
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Cao J, Yao X, Chen L, Kang K, Fu M, Chen Y. Effects of different introduction methods of Ce4+ and Zr4+ on denitration performance and anti-K poisoning performance of V2O5-WO3/TiO2 catalyst. J RARE EARTH 2020. [DOI: 10.1016/j.jre.2019.11.005] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Wu P, Zhang Y, Zhuang K, Shen K, Wang S, Huang T. Promoting effect and mechanism of neodymium on low-temperature selective catalytic reduction with NH3 over Mn/TiO2 catalysts. J RARE EARTH 2020. [DOI: 10.1016/j.jre.2019.09.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Zhou G, Maitarad P, Wang P, Han L, Yan T, Li H, Zhang J, Shi L, Zhang D. Alkali-Resistant NO x Reduction over SCR Catalysts via Boosting NH 3 Adsorption Rates by In Situ Constructing the Sacrificed Sites. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2020; 54:13314-13321. [PMID: 32960572 DOI: 10.1021/acs.est.0c04536] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Currently, improving the alkali resistance of vanadium-based catalysts still remains as an intractable issue for the selective catalytic reduction of NOx with NH3 (NH3-SCR). It is generally believed that the decrease in adsorbed NHx species deriving from the declined acidic sites is the chief culprit for the deactivation of alkali-poisoned catalysts. Herein, alkali-resistant NOx reduction over SCR catalysts via boosting NH3 adsorption rates was originally demonstrated by in situ constructing the sacrificed sites. It is interesting that the adsorbed NHx species largely decrease while the NH3 adsorption rate is well kept over the V2O5/CeO2 catalyst by in situ constructing the sacrificed sites. The SCR activity could be maintained after alkali poisoning because in situ constructed SO42- groups would prefer to be combined with K+ so that the specific V═O species can endow K-poisoned V2O5/CeO2 with high adsorption rate of NH3 and high reactivity of NHx species. This work provides a new viewpoint that NH3 adsorption rate plays more decisive roles in the performance of alkali-poisoned catalysts than the amount of NH3 adsorption and enlightens an alternative strategy to improve the alkali-resistance of catalysts, which is significant to both the academic and industrial fields.
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Affiliation(s)
- Guangyu Zhou
- International Joint Laboratory of Catalytic Chemistry, Department of Chemistry, Research Center of Nano Science and Technology, College of Sciences, Shanghai University, Shanghai 200444, China
| | - Phornphimon Maitarad
- International Joint Laboratory of Catalytic Chemistry, Department of Chemistry, Research Center of Nano Science and Technology, College of Sciences, Shanghai University, Shanghai 200444, China
| | - Penglu Wang
- International Joint Laboratory of Catalytic Chemistry, Department of Chemistry, Research Center of Nano Science and Technology, College of Sciences, Shanghai University, Shanghai 200444, China
| | - Lupeng Han
- International Joint Laboratory of Catalytic Chemistry, Department of Chemistry, Research Center of Nano Science and Technology, College of Sciences, Shanghai University, Shanghai 200444, China
| | - Tingting Yan
- International Joint Laboratory of Catalytic Chemistry, Department of Chemistry, Research Center of Nano Science and Technology, College of Sciences, Shanghai University, Shanghai 200444, China
| | - Hongrui Li
- International Joint Laboratory of Catalytic Chemistry, Department of Chemistry, Research Center of Nano Science and Technology, College of Sciences, Shanghai University, Shanghai 200444, China
| | - Jianping Zhang
- International Joint Laboratory of Catalytic Chemistry, Department of Chemistry, Research Center of Nano Science and Technology, College of Sciences, Shanghai University, Shanghai 200444, China
| | - Liyi Shi
- International Joint Laboratory of Catalytic Chemistry, Department of Chemistry, Research Center of Nano Science and Technology, College of Sciences, Shanghai University, Shanghai 200444, China
| | - Dengsong Zhang
- International Joint Laboratory of Catalytic Chemistry, Department of Chemistry, Research Center of Nano Science and Technology, College of Sciences, Shanghai University, Shanghai 200444, China
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Cai S, Xu T, Wang P, Han L, Impeng S, Li Y, Yan T, Chen G, Shi L, Zhang D. Self-Protected CeO 2-SnO 2@SO 42-/TiO 2 Catalysts with Extraordinary Resistance to Alkali and Heavy Metals for NO x Reduction. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2020; 54:12752-12760. [PMID: 32877168 DOI: 10.1021/acs.est.0c04911] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Reducing the poisoning effect of alkali and heavy metals over ammonia selective catalytic reduction (NH3-SCR) catalysts is still an intractable issue, as the presence of K and Pb in fly ash greatly hampers their catalytic activity by impairing the acidity and affecting the redox properties of the catalysts, leading to the reduction in the lifetime of SCR catalysts. To address this issue, we propose a novel self-protected antipoisoning mechanism by designing SO42-/TiO2 superacid supported CeO2-SnO2 catalysts. Owing to the synergistic effect between CeO2 and SnO2 and the strong acidity originating from the SO42-/TiO2 superacid, the catalysts show superior catalytic activity over a wide temperature range (240-510 °C). Moreover, when K or/and Pb are deposited on SO42-/TiO2 catalysts, the bond effect between SO42- and Ti-O would be broken so that the sulfate in the bulk of SO42-/TiO2 superacid support would be induced to migrate to the surface to bond with K and Pb, thus prohibiting poisons from attacking the Ce-Sn active sites, and significantly boosting the resistance. Hopefully, this novel self-protection mechanism derived from the migration of sulfate in the SO42-/TiO2 superacid to resist alkali and heavy metals provides a new avenue for designing novel catalysts with outstanding resistance to alkali and heavy metals.
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Affiliation(s)
- Sixiang Cai
- International Joint Laboratory of Catalytic Chemistry, Department of Chemistry, Research Center of Nano Science and Technology, College of Sciences, Shanghai University, Shanghai 200444, China
- State Key Laboratory of Marine Resource Utilization in South China Sea, School of Materials Science and Engineering, Hainan University, Haikou 570228, Hainan, China
| | - Tuoyu Xu
- International Joint Laboratory of Catalytic Chemistry, Department of Chemistry, Research Center of Nano Science and Technology, College of Sciences, Shanghai University, Shanghai 200444, China
- State Key Laboratory of Marine Resource Utilization in South China Sea, School of Materials Science and Engineering, Hainan University, Haikou 570228, Hainan, China
| | - Penglu Wang
- International Joint Laboratory of Catalytic Chemistry, Department of Chemistry, Research Center of Nano Science and Technology, College of Sciences, Shanghai University, Shanghai 200444, China
| | - Lupeng Han
- International Joint Laboratory of Catalytic Chemistry, Department of Chemistry, Research Center of Nano Science and Technology, College of Sciences, Shanghai University, Shanghai 200444, China
| | - Sarawoot Impeng
- National Nanotechnology Center, National Science and Technology Development Agency, Pathum Thani 12120, Thailand
| | - Yue Li
- State Key Laboratory of Marine Resource Utilization in South China Sea, School of Materials Science and Engineering, Hainan University, Haikou 570228, Hainan, China
| | - Tingting Yan
- International Joint Laboratory of Catalytic Chemistry, Department of Chemistry, Research Center of Nano Science and Technology, College of Sciences, Shanghai University, Shanghai 200444, China
| | - Guorong Chen
- International Joint Laboratory of Catalytic Chemistry, Department of Chemistry, Research Center of Nano Science and Technology, College of Sciences, Shanghai University, Shanghai 200444, China
| | - Liyi Shi
- International Joint Laboratory of Catalytic Chemistry, Department of Chemistry, Research Center of Nano Science and Technology, College of Sciences, Shanghai University, Shanghai 200444, China
| | - Dengsong Zhang
- International Joint Laboratory of Catalytic Chemistry, Department of Chemistry, Research Center of Nano Science and Technology, College of Sciences, Shanghai University, Shanghai 200444, China
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Cai Y, Wang L, Yu S, Sun J, Liu B, Dong L. Regeneration of deactivated CeCo O2 catalyst by simple thermal treatment. J RARE EARTH 2020. [DOI: 10.1016/j.jre.2019.12.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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14
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Khan MN, Han L, Wang P, Zhang D. Tailored Alkali Resistance of DeNO x Catalysts by Improving Redox Properties and Activating Adsorbed Reactive Species. iScience 2020; 23:101173. [PMID: 32480128 PMCID: PMC7262565 DOI: 10.1016/j.isci.2020.101173] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Revised: 04/26/2020] [Accepted: 05/13/2020] [Indexed: 11/30/2022] Open
Abstract
It is still challenging to develop strongly alkali-resistant catalysts for selective catalytic reduction of NOx with NH3. It is generally believed that the maintenance of acidity is the most important factor because of neutral effects of alkali. This work discovers that the redox properties rather than acidity play decisive roles in improving alkali resistance of some specific catalyst systems. K-poisoned Fe-decorated SO42−-modified CeZr oxide (Fe/SO42−/CeZr) catalysts show decreased acidity but reserve the high redox properties. The higher reactivity of NHx species induced by K poisoning compensates for the decreased amount of adsorbed NHx, leading to a desired reaction efficiency between adsorbed NHx and nitrate species. This study provides a unique perspective in designing an alkali-resistant deNOx catalyst via improving redox properties and activating the reactivities of NHx species rather than routinely increasing acidic sites for NHx adsorption, which is of significance for academic interests and practical applications. Fe-decorated SO42−-modified CeZr catalysts exhibit superior alkali resistance Improved redox properties compensate for the loss of the acidity Higher reactivity of NHx species makes up their decreased quantity Alkali resistance is enhanced via improving the redox and reactivity of NHx species
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Affiliation(s)
- Mehak Nawaz Khan
- State Key Laboratory of Advanced Special Steel, School of Materials Science and Engineering, Research Center of Nano Science and Technology, Department of Chemistry, College of Sciences, Shanghai University, Shanghai 200444, China
| | - Lupeng Han
- State Key Laboratory of Advanced Special Steel, School of Materials Science and Engineering, Research Center of Nano Science and Technology, Department of Chemistry, College of Sciences, Shanghai University, Shanghai 200444, China
| | - Penglu Wang
- State Key Laboratory of Advanced Special Steel, School of Materials Science and Engineering, Research Center of Nano Science and Technology, Department of Chemistry, College of Sciences, Shanghai University, Shanghai 200444, China
| | - Dengsong Zhang
- State Key Laboratory of Advanced Special Steel, School of Materials Science and Engineering, Research Center of Nano Science and Technology, Department of Chemistry, College of Sciences, Shanghai University, Shanghai 200444, China.
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15
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Promoting effect of microwave irradiation on CeO2-TiO2 catalyst for selective catalytic reduction of NO by NH3. J RARE EARTH 2020. [DOI: 10.1016/j.jre.2019.04.014] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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16
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Abstract
A sulfated sintered ore catalyst (SSOC) was prepared to improve the denitration performance of the sintered ore catalyst (SOC). The catalysts were characterized by X-ray Fluorescence Spectrometry (XRF), Brunauer–Emmett–Teller (BET) analyzer, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and diffuse reflectance infrared spectroscopy (DRIFTS) to understand the NH3-selective catalytic reduction (SCR) reaction mechanism. Moreover, the denitration performance and stability of SSOC were also investigated. The experimental results indicated that there were more Brønsted acid sites at the surface of SSOC after the treatment by sulfuric acid, which lead to the enhancement of the adsorption capacity of NH3 and NO. Meanwhile, Lewis acid sites were also observed at the SSOC surface. The reaction between −NH2, NH 4 + and NO (E-R mechanism) and the reaction of the coordinated ammonia with the adsorbed NO2 (L-H mechanism) were attributed to NOx reduction. The maximum denitration efficiency over the SSOC, which was about 92%, occurred at 300 °C, with a 1.0 NH3/NO ratio, and 5000 h−1 gas hourly space velocity (GHSV).
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Xu J, Yu H, Zhang C, Guo F, Xie J. Development of cerium-based catalysts for selective catalytic reduction of nitrogen oxides: a review. NEW J CHEM 2019. [DOI: 10.1039/c8nj05420g] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Nitrogen oxides (NOX) are major pollutants of the atmosphere, and selective catalytic reduction of nitrogen oxides using ammonia as a reductant (NH3-SCR) is an effective method to remove nitrogen oxides.
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Affiliation(s)
- Junqiang Xu
- College of Chemistry and Chemical Engineering
- Chongqing University of Technology
- Chongqing 400054
- China
| | - Haijie Yu
- College of Chemistry and Chemical Engineering
- Chongqing University of Technology
- Chongqing 400054
- China
| | - Chuan Zhang
- College of Chemistry and Chemical Engineering
- Chongqing University of Technology
- Chongqing 400054
- China
| | - Fang Guo
- College of Chemistry and Chemical Engineering
- Chongqing University of Technology
- Chongqing 400054
- China
| | - Jiaqing Xie
- College of Chemical and Environmental Engineering
- Sichuan University of Technology
- Zigong 643000
- China
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