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Wang X, Ye Q, Liu W, Meng F, Yang F, Zhang X, Dai H. Enhanced Resistance to Pb Poisoning of the Co‐modified Mn/Fe‐pillared Clay Catalysts for NH
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‐SCR at Low Temperatures. ChemistrySelect 2023. [DOI: 10.1002/slct.202204336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/09/2023]
Affiliation(s)
- Xinpeng Wang
- Department of Environmental Science Faculty of Environment and Life Beijing University of Technology Beijing 100124 China
| | - Qing Ye
- Department of Environmental Science Faculty of Environment and Life Beijing University of Technology Beijing 100124 China
| | - Wenyi Liu
- Department of Environmental Science Faculty of Environment and Life Beijing University of Technology Beijing 100124 China
| | - Fanwei Meng
- Department of Environmental Science Faculty of Environment and Life Beijing University of Technology Beijing 100124 China
| | - Fan Yang
- Department of Environmental Science Faculty of Environment and Life Beijing University of Technology Beijing 100124 China
| | - Xin Zhang
- State Key Laboratory of Heavy Oil Processing China University of Petroleum Beijing 102249 China
| | - Hongxing Dai
- Department of Chemical Engineering Faculty of Environment and Life Beijing University of Technology Beijing 100124 China
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2
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Recent advances in Pb resistance over SCR catalysts: reaction mechanisms and anti-inactivation measures. Catal Today 2023. [DOI: 10.1016/j.cattod.2023.114046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
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3
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Effects of Flue Gas Impurities on the Performance of Rare Earth Denitration Catalysts. Catalysts 2022. [DOI: 10.3390/catal12080808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Selective catalytic reduction (SCR) is still the most widely used process for controlling NOx gas pollution. Specifically, commercial vanadium-based catalysts have problems such as narrow operating temperature range and environmental pollution. Researchers have developed a series of cerium-based catalysts with good oxygen storage performance and excellent redox performance of CeO2. However, the anti-poisoning performance of the catalyst is the key to its application. There are many kinds of impurities in the flue gas, which has a huge impact on the catalyst. The deposition of substances, the reduction of active sites, the reduction of specific surface area, and the reduction of chemically adsorbed oxygen will affect the denitration activity of the catalyst to varying degrees, and the poisoning mechanism of different impurities on the catalyst is also different. Therefore, this review divides the impurities contained in flue gas into different types such as alkali metals, alkaline earth metals, heavy metals, and non-metals, and summarizes the effects and deactivation mechanisms of various types of impurities on the activity of rare earth catalysts. Finally, we hope that this work can provide a valuable reference for the development and application of NH3-SCR catalysts for rare earth denitration in the field of NOx control.
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Halawy SA, Osman AI, Abdelkader A, Nasr M, Rooney DW. Assessment of Lewis-Acidic Surface Sites Using Tetrahydrofuran as a Suitable and Smart Probe Molecule. ChemistryOpen 2022; 11:e202200021. [PMID: 35324079 PMCID: PMC8944219 DOI: 10.1002/open.202200021] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Revised: 03/04/2022] [Indexed: 02/03/2023] Open
Abstract
Measuring the Lewis-acidic surface sites in catalysis is problematic when the material's surface area is very low (SBET ≤1 m2 ⋅ g-1 ). For the first time, a quantitative assessment of total acidic surface sites of very small surface area catalysts (MoO3 as pure and mixed with 5-30 % CdO (wt/wt), as well as CdO for comparison) was performed using a smart new probe molecule, tetrahydrofuran (THF). The results were nearly identical compared to using another commonly used probe molecule, pyridine. This audition is based on the limited values of the surface area of these samples that likely require a relatively moderate basic molecule as THF with pKb =16.08, rather than strong basic molecules such as NH3 (pKb =4.75) or pyridine (pKb =8.77). We propose mechanisms for the interaction of vapour phase molecules of THF with the Lewis-cationic Mo and Cd atoms of these catalysts. Besides, dehydration of isopropyl alcohol was used as a probe reaction to investigate the catalytic activity of these catalysts to further support our findings in the case of THF in a temperature range of 175-300 °C. A good agreement between the obtained data of sample MoO3 -10 % CdO, which is characterised by the highest surface area value, the population of Lewis-acidic sites and % selectivity of propylene at all the applied reaction temperatures was found.
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Affiliation(s)
- Samih A. Halawy
- Nanocomposite Catalysts Lab.Chemistry DepartmentFaculty of Science at QenaSouth Valley UniversityQena83523Egypt
| | - Ahmed I. Osman
- Nanocomposite Catalysts Lab.Chemistry DepartmentFaculty of Science at QenaSouth Valley UniversityQena83523Egypt
- School of Chemistry and Chemical EngineeringQueen's University BelfastDavid Keir BuildingBelfastBT9 5AGUK
| | - Adel Abdelkader
- Nanocomposite Catalysts Lab.Chemistry DepartmentFaculty of Science at QenaSouth Valley UniversityQena83523Egypt
| | - Mahmoud Nasr
- Nanocomposite Catalysts Lab.Chemistry DepartmentFaculty of Science at QenaSouth Valley UniversityQena83523Egypt
| | - David W. Rooney
- School of Chemistry and Chemical EngineeringQueen's University BelfastDavid Keir BuildingBelfastBT9 5AGUK
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Mu J, Liu J, Qin J, Li X, Liu B. Unveiling remarkable resistance to Pb poisoning over an Fe–Mo catalyst for low-temperature NH 3-SCR: poison transforms into a promoter. Catal Sci Technol 2022. [DOI: 10.1039/d2cy00630h] [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
A heavy metal-resistant NOx catalytic reduction Fe–Mo catalyst was developed and a novel intrinsic activity enhancement mechanism by Pb species was originally demonstrated.
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Affiliation(s)
- Jincheng Mu
- College of Resource and Environmental Engineering, Guizhou University, Guizhou Karst Environmental Ecosystems Observation and Research Station, Key Laboratory of Karst Georesources and Environment, Ministry of Education, Guiyang, 550025, China
| | - Jie Liu
- Department of Environmental Science & Engineering, North China Electric Power University, Baoding, 071003, China
| | - Jiangzhou Qin
- Department of Environmental Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China
| | - Xinyong Li
- State Key Laboratory of Fine Chemicals, Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
| | - Baojun Liu
- College of Resource and Environmental Engineering, Guizhou University, Guizhou Karst Environmental Ecosystems Observation and Research Station, Key Laboratory of Karst Georesources and Environment, Ministry of Education, Guiyang, 550025, China
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Li C, Cheng J, Ye Q, Meng F, Wang X, Dai H. The Deactivation Mechanism of the Mo-Ce/Zr-PILC Catalyst Induced by Pb for the Selective Catalytic Reduction of NO with NH 3. NANOMATERIALS (BASEL, SWITZERLAND) 2021; 11:2641. [PMID: 34685077 PMCID: PMC8541312 DOI: 10.3390/nano11102641] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/12/2021] [Revised: 09/26/2021] [Accepted: 09/30/2021] [Indexed: 11/16/2022]
Abstract
As a heavy metal, Pb is one component in coal-fired flue gas and is widely considered to have a strong negative effect on catalyst activity in the selective catalytic reduction of NOx by NH3 (NH3-SCR). In this paper, we investigated the deactivation mechanism of the Mo-Ce/Zr-PILC catalyst induced by Pb in detail. We found that NO conversion over the 3Mo4Ce/Zr-PILC catalyst decreased greatly after the addition of Pb. The more severe deactivation induced by Pb was attributed to low surface area, lower amounts of chemisorbed oxygen species and surface Ce3+, and lower redox ability and surface acidity (especially a low number of Brønsted acid sites). Furthermore, the addition of Pb inhibited the formation of highly active intermediate nitrate species generated on the surface of the catalyst, hence decreasing the NH3-SCR activity.
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Affiliation(s)
- Chenxi Li
- Key Laboratory of Beijing on Regional Air Pollution Control, Department of Environmental Science, School of Environmental and Chemical Engineering, Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China; (C.L.); (J.C.); (F.M.); (X.W.)
| | - Jin Cheng
- Key Laboratory of Beijing on Regional Air Pollution Control, Department of Environmental Science, School of Environmental and Chemical Engineering, Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China; (C.L.); (J.C.); (F.M.); (X.W.)
| | - Qing Ye
- Key Laboratory of Beijing on Regional Air Pollution Control, Department of Environmental Science, School of Environmental and Chemical Engineering, Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China; (C.L.); (J.C.); (F.M.); (X.W.)
| | - Fanwei Meng
- Key Laboratory of Beijing on Regional Air Pollution Control, Department of Environmental Science, School of Environmental and Chemical Engineering, Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China; (C.L.); (J.C.); (F.M.); (X.W.)
| | - Xinpeng Wang
- Key Laboratory of Beijing on Regional Air Pollution Control, Department of Environmental Science, School of Environmental and Chemical Engineering, Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China; (C.L.); (J.C.); (F.M.); (X.W.)
| | - Hongxing Dai
- Beijing Key Laboratory for Green Catalysis and Separation, Key Laboratory of Beijing on Regional Air Pollution Control, Key Laboratory of Advanced Functional Materials, Education Ministry of China, and Laboratory of Catalysis Chemistry and Nanoscience, Department of Environmental Chemical Engineering, School of Environmental and Chemical Engineering, Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China
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Wu YW, Zhou XY, Cai Q, Hu Z, Mi TG, Zhang B, Zhao L, Lu Q. Intrinsic mechanism insight of the interaction between lead species and the Vanadium-based catalysts based on First-principles investigation. J Colloid Interface Sci 2021; 607:1362-1372. [PMID: 34583041 DOI: 10.1016/j.jcis.2021.09.081] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Revised: 08/17/2021] [Accepted: 09/15/2021] [Indexed: 12/21/2022]
Abstract
Lead (Pb) species trigger serious poisoning of selective catalytic reduction (SCR) catalysts. To improve the Pb resistance ability, revealing the impact mechanism of Pb species on the commercial SCR catalysts from a molecular level is of great significance. Herein, first-principles calculations were applied to unveil the Pb adsorption mechanism on the vanadium-based catalysts, the results were also compared with the previous experimental findings. The intrinsic interaction mechanism between Pb and catalyst components was interpreted by clarifying the change of the catalyst electronic structures (including charge transfer, bond formation situations, and active sites reactivities). It is found that the adsorption of Pb species belongs to chemisorption, evident electron transfer with the catalyst surface is inspected and intense charge transfer indicates strong adsorption. A remarkable interaction with the V = O active sites occurs and stable Pb-O bonds are formed, which significantly changes the electronic structures of the V = O sites and inhibits the NH3 adsorption, thus suppressing the SCR activity. Finally, thermodynamic analysis was applied to elucidate the temperature influence on Pb adsorption. It is found that Pb adsorption on catalysts cannot proceed spontaneously over 500 K. At higher temperatures the adsorption is inhibited and the Pb species become less stable, which partially explains why the Pb-poisoning effect at high temperatures is relatively moderate than that at low temperatures.
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Affiliation(s)
- Yang-Wen Wu
- National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, Beijing 102206, China
| | - Xin-Yue Zhou
- National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, Beijing 102206, China
| | - Qi Cai
- National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, Beijing 102206, China
| | - Zhuang Hu
- National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, Beijing 102206, China
| | - Teng-Ge Mi
- National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, Beijing 102206, China
| | - Bing Zhang
- National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, Beijing 102206, China
| | - Li Zhao
- National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, Beijing 102206, China
| | - Qiang Lu
- National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, Beijing 102206, China.
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Li G, Mao D, Chao M, Li G, Yu J, Guo X. Significantly enhanced Pb resistance of a Co-modified Mn–Ce–O x/TiO 2 catalyst for low-temperature NH 3-SCR of NO x. Catal Sci Technol 2020. [DOI: 10.1039/d0cy01066a] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Co modification can significantly improve the performance for low-temperature NH3-SCR of NOx and the Pb resistance of the Mn–Ce–Ox/TiO2 catalyst.
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Affiliation(s)
- Gehua Li
- School of Chemical and Environmental Engineering
- Shanghai Institute of Technology
- Shanghai 201418
- PR China
| | - Dongsen Mao
- School of Chemical and Environmental Engineering
- Shanghai Institute of Technology
- Shanghai 201418
- PR China
| | - Mengxi Chao
- School of Chemical and Environmental Engineering
- Shanghai Institute of Technology
- Shanghai 201418
- PR China
| | - Gang Li
- School of Chemical and Environmental Engineering
- Shanghai Institute of Technology
- Shanghai 201418
- PR China
| | - Jun Yu
- School of Chemical and Environmental Engineering
- Shanghai Institute of Technology
- Shanghai 201418
- PR China
| | - Xiaoming Guo
- School of Chemical and Environmental Engineering
- Shanghai Institute of Technology
- Shanghai 201418
- PR China
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