1
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Yin Y, Luo B, Li K, Moskowitz BM, Mosevizky Lis B, Wachs IE, Zhu M, Sun Y, Zhu T, Li X. Plasma-assisted manipulation of vanadia nanoclusters for efficient selective catalytic reduction of NO x. Nat Commun 2024; 15:3592. [PMID: 38678057 PMCID: PMC11055856 DOI: 10.1038/s41467-024-47878-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Accepted: 04/09/2024] [Indexed: 04/29/2024] Open
Abstract
Supported nanoclusters (SNCs) with distinct geometric and electronic structures have garnered significant attention in the field of heterogeneous catalysis. However, their directed synthesis remains a challenge due to limited efficient approaches. This study presents a plasma-assisted treatment strategy to achieve supported metal oxide nanoclusters from a rapid transformation of monomeric dispersed metal oxides. As a case study, oligomeric vanadia-dominated surface sites were derived from the classic supported V2O5-WO3/TiO2 (VWT) catalyst and showed nearly an order of magnitude increase in turnover frequency (TOF) value via an H2-plasma treatment for selective catalytic reduction of NO with NH3. Such oligomeric surface VOx sites were not only successfully observed and firstly distinguished from WOx and TiO2 by advanced electron microscopy, but also facilitated the generation of surface amide and nitrates intermediates that enable barrier-less steps in the SCR reaction as observed by modulation excitation spectroscopy technologies and predicted DFT calculations.
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Affiliation(s)
- Yong Yin
- School of Space and Environment, Beihang University, Beijing, 100191, China
| | - Bingcheng Luo
- College of Science, China Agricultural University, Beijing, 100083, China
| | - Kezhi Li
- Institute of Engineering Technology, Sinopec Catalyst Co. Ltd., Beijing, 101111, China
| | - Benjamin M Moskowitz
- Operando Molecular Spectroscopy & Catalysis Laboratory, Department of Chemical and Biomolecular Engineering, Lehigh University, Bethlehem, PA, 18015, USA
| | - Bar Mosevizky Lis
- Operando Molecular Spectroscopy & Catalysis Laboratory, Department of Chemical and Biomolecular Engineering, Lehigh University, Bethlehem, PA, 18015, USA
| | - Israel E Wachs
- Operando Molecular Spectroscopy & Catalysis Laboratory, Department of Chemical and Biomolecular Engineering, Lehigh University, Bethlehem, PA, 18015, USA.
| | - Minghui Zhu
- State Key Laboratory of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China.
| | - Ye Sun
- School of Space and Environment, Beihang University, Beijing, 100191, China
| | - Tianle Zhu
- School of Space and Environment, Beihang University, Beijing, 100191, China
| | - Xiang Li
- School of Space and Environment, Beihang University, Beijing, 100191, China.
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2
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Lv Z, He G, Zhang W, Liu J, Lian Z, Yang Y, Yan Z, Xu G, Shan W, Yu Y, He H. Interface sites on vanadia-based catalysts are highly active for NO x removal under realistic conditions. J Environ Sci (China) 2024; 136:523-536. [PMID: 37923461 DOI: 10.1016/j.jes.2022.10.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 09/29/2022] [Accepted: 10/07/2022] [Indexed: 11/07/2023]
Abstract
TiO2-supported V2O5 catalysts are commonly used in NOx reduction with ammonia due to their robust catalytic performance. Over these catalysts, it is generally considered that the active species are mainly derived from the vanadia species rather than the intrinsic structure of V-O-Ti entities, namely the interface sites. To reveal the role of V-O-Ti entities in NH3-SCR, herein, we prepared TiO2/V2O5 catalysts and demonstrated that V-O-Ti entities were more active for NOx reduction under wet conditions than the V sites (V=O) working alone. On the V-O-Ti entities, kinetic measurements and first principles calculations revealed that NH3 activation exhibited a much lower energy barrier than that on V=O sites. Under wet conditions, the V-O-Ti interface significantly inhibited the transformation of V=O to V-OH sites thus benefiting NH3 activation. Under wet conditions, meanwhile, the migration of NH4+ from Ti site neighboring the V-O-Ti interface to Ti site of the V-O-Ti interface was exothermic; thus, V-O-Ti entities together with neighboring Ti sites could serve as channels linking NH3 pool and active centers for activation of NH4+. This finding reveals that the V-O-Ti interface sites on V-based catalysts play a crucial role in NOx removal under realistic conditions, providing a new perspective on NH3-SCR mechanism.
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Affiliation(s)
- Zhihui Lv
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Guangzhi He
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Wenshuo Zhang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jingjing Liu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhihua Lian
- Center for Excellence in Regional Atmospheric Environment and Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
| | - Yang Yang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Zidi Yan
- Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou 341000, China
| | - Guangyan Xu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Wenpo Shan
- Center for Excellence in Regional Atmospheric Environment and Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; Ningbo Research Center for Urban Environment, Chinese Academy of Sciences, Ningbo 315800, China
| | - Yunbo Yu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China; Center for Excellence in Regional Atmospheric Environment and Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou 341000, China.
| | - Hong He
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China; Center for Excellence in Regional Atmospheric Environment and Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
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3
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Sun L, Wang Z, Zang M. Denitrification activity test of a V modified Mn-based ceramic filter. RSC Adv 2023; 13:19965-19974. [PMID: 37409030 PMCID: PMC10318854 DOI: 10.1039/d3ra02561f] [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: 04/18/2023] [Accepted: 06/26/2023] [Indexed: 07/07/2023] Open
Abstract
In view of the characteristics of high temperature denitrification and low water and sulfur resistance of single manganese-based catalysts, a vanadium-manganese-based ceramic filter (VMA(14)-CCF) was prepared by the impregnation method modified with V. The results showed that the NO conversion of VMA(14)-CCF was more than 80% at 175-400 °C. At 225-300 °C, the conversion of NO can reach 100%. High NO conversion and low pressure drop can be maintained at all face velocities. The resistance of VMA(14)-CCF to water, sulfur and alkali metal poisoning is better than that of a single manganese-based ceramic filter. XRD, SEM, XPS and BET were further used for characterization analysis. The introduction of V protects the MnOx center, promotes the conversion of Mn3+ to Mn4+, and provides abundant surface adsorbed oxygen. The development of VMA(14)-CCF greatly broadens the application range of ceramic filters in denitrification.
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Affiliation(s)
- Lei Sun
- Anhui Academy for Ecological and Environmental Science Research Hefei 230071 China
| | - Zhenzhen Wang
- School of Resource and Environmental Engineering, Hefei University of Technology Hefei 230009 China
| | - Mengxi Zang
- School of Resource and Environmental Engineering, Hefei University of Technology Hefei 230009 China
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4
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Kentri T, Tsevis A, Boghosian S. Heterogeneity of the vanadia phase dispersed on titania. Co-existence of distinct mono-oxo VO x sites. Dalton Trans 2023. [PMID: 37211989 DOI: 10.1039/d3dt00749a] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The structural and configurational characteristics of the species comprising the (VOx)n phase dispersed on TiO2(P25) are studied under oxidative dehydration conditions by in situ molecular vibrational spectroscopy (Raman, FTIR) complemented by in situ Raman/18O isotope exchange and Raman spectroscopy under static equilibrium at temperatures of 175-430 °C and coverages in the 0.40-5.5 V nm-2 range. It is found that the dispersed (VOx)n phase consists of distinct species with different configurations. At low coverages of 0.40 and 0.74 V nm-2, isolated (monomeric) species prevail. Two distinct mono-oxo species are found: (i) a majority Species-I, presumably of distorted tetrahedral OV(-O-)3 configuration with VO mode at 1022-1024 cm-1 and (ii) a minority Species-II, presumably of distorted octahedral-like OV(-O-)4 configuration with VO mode at 1013-1014 cm-1. Cycling the catalysts in the 430 → 250 → 175 → 430 °C sequence results in temperature-dependent structural transformations. With decreasing temperature, a Species-II → Species-I transformation with concomitant surface hydroxylation takes place by means of a hydrolysis mechanism mediated by water molecules retained by the surface. A third species (Species-III, presumably of di-oxo configuration with νs/νas at ∼995/985 cm-1) occurs in minority and its presence is increased when further lowering the temperature according to a Species-I → Species-III hydrolysis step. Species-II (OV(-O-)4) shows the highest reactivity to water. For coverages above 1 V nm-2, an association of VOx units takes place leading to gradually larger polymeric domains when the coverage is increased in the 1.1-5.5 V nm-2 range. Polymeric (VOx)n domains comprise building units that maintain the structural characteristics (termination configuration and V coordination number) of Species-I, Species-II, and Species-III. The terminal VO stretching modes are blue-shifted with increasing (VOx)n domain size. A lower extent of hydroxylation is evidenced under static equilibrium forced dehydrated conditions, thereby limiting the temperature dependent structural transformations and excluding the possibility of incoming water vapors as the cause for the temperature dependent effects observed in the in situ Raman/FTIR spectra. The results address open issues and offer new insight in the structural studies of VOx/TiO2 catalysts.
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Affiliation(s)
- Theocharis Kentri
- Department of Chemical Engineering, University of Patras, Patras, Greece.
- Institute of Chemical Engineering Sciences, FORTH/ICE-HT, Patras, Greece
| | - Athanasios Tsevis
- School of Science and Technology, Hellenic Open University, GR-26335 Patras, Greece
| | - Soghomon Boghosian
- Department of Chemical Engineering, University of Patras, Patras, Greece.
- Institute of Chemical Engineering Sciences, FORTH/ICE-HT, Patras, Greece
- School of Science and Technology, Hellenic Open University, GR-26335 Patras, Greece
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5
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Zhang P, Chen A, Lan T, Liu X, Yan T, Ren W, Zhang D. Balancing acid and redox sites of phosphorylated CeO 2 catalysts for NO x reduction: The promoting and inhibiting mechanism of phosphorus. JOURNAL OF HAZARDOUS MATERIALS 2023; 441:129867. [PMID: 36115091 DOI: 10.1016/j.jhazmat.2022.129867] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2022] [Revised: 08/16/2022] [Accepted: 08/26/2022] [Indexed: 06/15/2023]
Abstract
The role of phosphorus in metal oxide catalysts is still controversial. The precise tuning of the acidic and redox properties of metal oxide catalysts for the selective catalytic reduction in NOx using NH3 is also a great challenge. Herein, CeO2 catalysts with different degrees of phosphorylation were used to study the balance between the acidity and redox property by promoting and inhibiting effects of phosphorus. CeO2 catalysts phosphorylated with lower phosphorus content (5 wt%) exhibited superior NOx reduction performance with above 90% NOx conversion during 240-420 °C due to the balanced acidity and reducibility derived from the highest content of Brønsted acid sites on PO43- to adsorb NH3 and surface adsorbed oxygen species. Plenty of PO3- over CeO2 catalysts phosphorylated with the higher phosphorus content (≥ 10 wt%) significantly disrupted the balance between the acidity and the redox property due to the reduced acid/redox sites, which resulted in the less active NOx species. The mechanism of different structural phosphorus species (PO43- and PO3-) in promoting or inhibiting the NOx reduction over CeO2 catalysts was revealed. This work provides a novel method for qualitative and quantitative study of the relationship between acidity/redox property and activity of catalysts for NOx reduction.
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Affiliation(s)
- Pan Zhang
- State Key Laboratory of Advanced Special Steel, School of Materials Science and Engineering, International Joint Laboratory of Catalytic Chemistry, College of Sciences, Shanghai University, No.99 Shangda Road, Shanghai 200444, PR China
| | - Aling Chen
- State Key Laboratory of Advanced Special Steel, School of Materials Science and Engineering, International Joint Laboratory of Catalytic Chemistry, College of Sciences, Shanghai University, No.99 Shangda Road, Shanghai 200444, PR China
| | - Tianwei Lan
- State Key Laboratory of Advanced Special Steel, School of Materials Science and Engineering, International Joint Laboratory of Catalytic Chemistry, College of Sciences, Shanghai University, No.99 Shangda Road, Shanghai 200444, PR China
| | - Xiangyu Liu
- State Key Laboratory of Advanced Special Steel, School of Materials Science and Engineering, International Joint Laboratory of Catalytic Chemistry, College of Sciences, Shanghai University, No.99 Shangda Road, Shanghai 200444, PR China
| | - Tingting Yan
- State Key Laboratory of Advanced Special Steel, School of Materials Science and Engineering, International Joint Laboratory of Catalytic Chemistry, College of Sciences, Shanghai University, No.99 Shangda Road, Shanghai 200444, PR China
| | - Wei Ren
- State Key Laboratory of Advanced Special Steel, School of Materials Science and Engineering, International Joint Laboratory of Catalytic Chemistry, College of Sciences, Shanghai University, No.99 Shangda Road, Shanghai 200444, PR China
| | - Dengsong Zhang
- State Key Laboratory of Advanced Special Steel, School of Materials Science and Engineering, International Joint Laboratory of Catalytic Chemistry, College of Sciences, Shanghai University, No.99 Shangda Road, Shanghai 200444, PR China.
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6
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Jiang S, Li X, Yin Y, Luo B, Isah AG, Zhang Z, Zhu T. Extraordinary deactivation offset effect of zinc and arsenic on V 2O 5 -WO 3/TiO 2 catalysts: Like cures like. JOURNAL OF HAZARDOUS MATERIALS 2023; 441:129894. [PMID: 36087534 DOI: 10.1016/j.jhazmat.2022.129894] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Revised: 08/23/2022] [Accepted: 08/30/2022] [Indexed: 06/15/2023]
Abstract
The commercial V2O5 -WO3/TiO2 (VWTi) catalysts often suffer from a serious joint deactivation by multiple heavy metals in the flue gas for NOx removal by NH3-SCR. Herein, we report an extraordinary deactivation offset effect between Zn and As on VWTi with alleviation of the toxic effects of the heavy metals by "like cures like". With the As&Zn content of 4 wt%, VWTi-As&Zn exhibited over 97% NO conversion under a GHSV of 100,000 h-1 and good SO2/H2O tolerance (> 93% NO conversion). It's presented 85% of fresh VWTi, exceeding those of VWTi-Zn (15%) by 5.6-fold and VWTi-As (70%) by 1.2-fold. Structure analysis showed that, unlike VWTi-As and VWTi-Zn, the VO vibration and dispersion state of VOx sites over VWTi-As&Zn were hardly affected. Moreover, VWTi-As&Zn possessed both the Lewis and Brønsted acid sites while VWTi-Zn and VWTi-As had only one type of them. The operando infrared/Raman/UV-vis spectroscopy and DFT calculations verified that the less affected VOx sites mainly reflected in three aspects: 1) the electron interaction between As and Zn; 2) the active VO Lewis acid sites; 3) lower energy barrier for N - H bond breaking. The "like cures like" phenomenon may open up an innovative pathway for the control of hazardous heavy metals.
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Affiliation(s)
- Si Jiang
- School of Space and Environment, Beihang University, Beijing 100191, PR China
| | - Xiang Li
- School of Space and Environment, Beihang University, Beijing 100191, PR China.
| | - Yong Yin
- School of Space and Environment, Beihang University, Beijing 100191, PR China
| | - Bingcheng Luo
- College of Science, China Agricultural University, Beijing 100083, PR China
| | | | - Zili Zhang
- School of Science, China University of Geosciences, Beijing 100083, PR China
| | - Tianle Zhu
- School of Space and Environment, Beihang University, Beijing 100191, PR China
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7
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Chen G, Chen J, Chen X, Yin R, Li K, Li J. Monolith or Powder: Improper Sample Pretreatment May Mislead the Understanding of Industrial V 2O 5-WO 3/TiO 2 Catalysts Operated in Stationary Resources. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:16394-16399. [PMID: 36261232 DOI: 10.1021/acs.est.2c05022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Although various characterizations are widely applied to commercial V2O5-WO3/TiO2 catalysts, the influence of the catalyst physical structure, i.e., monolith or powder, on the characterization results has not been investigated. Several important catalytic behaviors and phenomena were observed in this study using V2O5-WO3/TiO2 monolithic catalysts employed for over 5000 h in various stationary flue gases, and many of the results were only observable on monolithic catalysts, such as depth-dependent distribution of external elements, penetration of As2O3, and the formation of Tl2O-TiO2 p-n junctions. If the monolith is ground into powder states, it will alter or destroy the catalyst surface and remove important clues closely related to catalytic performance under working conditions. The redox and acidity properties of V2O5-WO3/TiO2 obtained from powder samples may be significantly different from their true state under working conditions, resulting in a misperception of catalyst performance. Therefore, a cautious pretreatment should be taken into careful consideration when analyzing commercial honeycomb V2O5-WO3/TiO2 catalysts.
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Affiliation(s)
- Gongda Chen
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, PR China
- New Technology Center, Guangdong Energy Group Science and Technology Research Institute Co., Ltd., Guangzhou 510630, PR China
| | - Jianjun Chen
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, PR China
| | - Xiaoping Chen
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, PR China
| | - Rongqiang Yin
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, PR China
| | - Kezhi Li
- Institute of Engineering Technology, Sinopec Catalyst Co., Ltd., Beijing 100029, PR China
| | - Junhua Li
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, PR China
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8
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Chen W, Zou R, Wang X. Toward an Atomic-Level Understanding of the Catalytic Mechanism of Selective Catalytic Reduction of NO x with NH 3. ACS Catal 2022. [DOI: 10.1021/acscatal.2c03508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Weibin Chen
- School of Materials Science and Engineering, Peking University, Beijing100871, People’s Republic of China
| | - Ruqiang Zou
- School of Materials Science and Engineering, Peking University, Beijing100871, People’s Republic of China
| | - Xidong Wang
- School of Materials Science and Engineering, Peking University, Beijing100871, People’s Republic of China
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9
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Liu X, Wang P, Shen Y, Bi S, Ren W, Zhang D. Boosting SO 2-Tolerant Catalytic Reduction of NO x via Selective Adsorption and Activation of Reactants over Ce 4+–SO 42– Pair Sites. ACS Catal 2022. [DOI: 10.1021/acscatal.2c02699] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xiangyu Liu
- 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
| | - Yongjie Shen
- International Joint Laboratory of Catalytic Chemistry, College of Sciences, Shanghai University, Shanghai 200444, China
| | - Shanyuan Bi
- International Joint Laboratory of Catalytic Chemistry, College of Sciences, Shanghai University, Shanghai 200444, China
| | - Wei Ren
- 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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10
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The Emergence of the Ubiquity of Cerium in Heterogeneous Oxidation Catalysis Science and Technology. Catalysts 2022. [DOI: 10.3390/catal12090959] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Research into the incorporation of cerium into a diverse range of catalyst systems for a wide spectrum of process chemistries has expanded rapidly. This has been evidenced since about 1980 in the increasing number of both scientific research journals and patent publications that address the application of cerium as a component of a multi-metal oxide system and as a support material for metal catalysts. This review chronicles both the applied and fundamental research into cerium-containing oxide catalysts where cerium’s redox activity confers enhanced and new catalytic functionality. Application areas of cerium-containing catalysts include selective oxidation, combustion, NOx remediation, and the production of sustainable chemicals and materials via bio-based feedstocks, among others. The newfound interest in cerium-containing catalysts stems from the benefits achieved by cerium’s inclusion, which include selectivity, activity, and stability. These benefits arise because of cerium’s unique combination of chemical and thermal stability, its redox active properties, its ability to stabilize defect structures in multicomponent oxides, and its propensity to stabilize catalytically optimal oxidation states of other multivalent elements. This review surveys the origins and some of the current directions in the research and application of cerium oxide-based catalysts.
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11
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Wachs IE. Progress in Catalysis by Mixed Oxides: From Confusion to Catalysis Science. Catal Today 2022. [DOI: 10.1016/j.cattod.2022.08.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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12
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Li Z, Zhang Q, Yang J, Li Y, Cui J, Ma Y, Yang C. Fabrication of wide temperature Fe xCe 1-xVO 4 modified TiO 2-graphene catalyst with excellent NH 3-SCR performance and strong SO 2/H 2O tolerance. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:53259-53268. [PMID: 35278188 DOI: 10.1007/s11356-022-18774-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Accepted: 01/17/2022] [Indexed: 06/14/2023]
Abstract
Selective catalytic reduction of NO with NH3 (NH3-SCR) is one of the most common technique for elimination of NOx. The promotional effect of Fe additive on the NH3-SCR activity of the CeVO4/TiO2-graphene (GE) is systematically studied. The results exhibited that the low-temperature NOx conversion could be enhanced dramatically via the addition of Fe and Fe0.5Ce0.5VO4/TiO2-GE displayed the highest conversion of NOx in the wide temperature window (200-400 °C). It is because that Fe3+ + Ce3+ ↔ Fe2+ + Ce4+ facilitated the oxidization of NO to NO2 at low temperature and led to the "Fast SCR," thereby raising the SCR performance. What is more, the introduction of Fe enhanced redox ability, the surface relative percentage of Ce3+, V5+ and the chemical adsorbed oxygen. Furthermore, the high surface concentration of Ce3+ species can produce more active oxygen and leads to the "Fast SCR" reaction. In addition, the Fe0.5Ce0.5VO4/TiO2-GE catalyst showed excellent H2O/SO2 tolerance, which may be due to the decomposition of ammonium bisulphite under high temperature and the hydrophobicity of graphene. What is more, it displayed outstanding the stability. This work would provide theoretical reference for the practical application of NOx abatement via NH3-SCR.
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Affiliation(s)
- Zhifang Li
- College of Materials Science and Engineering, Qiqihar University, Wenhua Street 42, Qiqihar, 161006, China
- Heilongjiang Province Key Laboratory of Polymeric Composite Material, Qiqihar University, Wenhua Street 42, Qiqihar, 161006, China
| | - Qian Zhang
- College of Materials Science and Engineering, Qiqihar University, Wenhua Street 42, Qiqihar, 161006, China
| | - Jian Yang
- College of Materials Science and Engineering, Qiqihar University, Wenhua Street 42, Qiqihar, 161006, China
| | - Yueyu Li
- College of Materials Science and Engineering, Qiqihar University, Wenhua Street 42, Qiqihar, 161006, China
| | - Jinxing Cui
- College of Materials Science and Engineering, Qiqihar University, Wenhua Street 42, Qiqihar, 161006, China.
- Heilongjiang Province Key Laboratory of Polymeric Composite Material, Qiqihar University, Wenhua Street 42, Qiqihar, 161006, China.
- College of Materials Science and Engineering, Graphene Functional Materials Research Laboratory, Qiqihar University, Wenhua Street 42, Qiqihar, 161006, China.
| | - Yuanyuan Ma
- College of Chemistry and Chemical Engineering, Qiqihar University, Qiqihar, 161006, China
| | - Changlong Yang
- College of Materials Science and Engineering, Qiqihar University, Wenhua Street 42, Qiqihar, 161006, China.
- Heilongjiang Province Key Laboratory of Polymeric Composite Material, Qiqihar University, Wenhua Street 42, Qiqihar, 161006, China.
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13
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Fang X, Qu W, Qin T, Hu X, Chen L, Ma Z, Liu X, Tang X. Abatement of Nitrogen Oxides via Selective Catalytic Reduction over Ce 1-W 1 Atom-Pair Sites. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:6631-6638. [PMID: 35500091 DOI: 10.1021/acs.est.2c00482] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Environmentally benign CeO2-WO3/TiO2 catalysts are promising alternatives to commercial toxic V2O5-WO3/TiO2 for controlling NOx emission via selective catalytic reduction (SCR), but the insufficient catalytic activity of CeO2-WO3/TiO2 catalysts is one of the obstacles in their applications because of a lack of an in-depth understanding of the CeO2-WO3 interactions. Herein, we design a Ce1-W1/TiO2 model catalyst by anchoring Ce1-W1 atom pairs on anatase TiO2(001) to investigate the synergy between Ce and W in SCR. A series of characterizations combined with density functional theory calculations and in situ diffuse-reflectance infrared Fourier-transform experiments reveal that there exists a strong electronic interaction within Ce1-W1 atom pairs, leading to a much better SCR performance of Ce1-W1/TiO2 compared with that of Ce1/TiO2 and W1/TiO2. The Ce1-W1 synergy not only shifts down the lowest unoccupied states of Ce1 near the Fermi level, thus enhancing the abilities in adsorbing and oxidizing NH3 but also makes the frontier orbital electrons of W1 delocalized, thus accelerating the activation of O2. The deep insight of the Ce-W synergy may assist in the design and development of efficient catalysts with an SCR activity as high as or even higher than V2O5-WO3/TiO2.
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Affiliation(s)
- Xue Fang
- Department of Environmental Science & Engineering, Fudan University, 2005 Songhu Road, Shanghai 200438, China
| | - Weiye Qu
- Department of Environmental Science & Engineering, Fudan University, 2005 Songhu Road, Shanghai 200438, China
| | - Tian Qin
- School of Chemistry and Chemical Engineering, In Situ Center for Physical Science, Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Xiaolei Hu
- Department of Environmental Science & Engineering, Fudan University, 2005 Songhu Road, Shanghai 200438, China
| | - Liwei Chen
- School of Chemistry and Chemical Engineering, In Situ Center for Physical Science, Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Zhen Ma
- Department of Environmental Science & Engineering, Fudan University, 2005 Songhu Road, Shanghai 200438, China
- Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China
| | - Xi Liu
- School of Chemistry and Chemical Engineering, In Situ Center for Physical Science, Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Xingfu Tang
- Department of Environmental Science & Engineering, Fudan University, 2005 Songhu Road, Shanghai 200438, China
- Jiangsu Collaborative Innovation Center of Atmospheric Environment & Equipment Technology, Nanjing University of Information Science & Technology, Nanjing 210044, China
- Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China
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14
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Liu W, Gao Z, Sun M, Gao J, Wang L, Zhao X, Yang R, Yu L. One-pot synthesis of CrαMnβCeTiOx mixed oxides as NH3-SCR catalysts with enhanced low-temperature catalytic activity and sulfur resistance. Chem Eng Sci 2022. [DOI: 10.1016/j.ces.2022.117450] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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15
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Xu G, Li H, Yu Y, He H. Dynamic Change of Active Sites of Supported Vanadia Catalysts for Selective Catalytic Reduction of Nitrogen Oxides. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:3710-3718. [PMID: 35195409 DOI: 10.1021/acs.est.1c07739] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Selective catalytic reduction of NOx by ammonia (NH3-SCR) on V2O5/TiO2 catalysts is a widely used commercial technology in power plants and diesel vehicles due to its high elimination efficiency for NOx removal. However, the mechanistic aspects of the NH3-SCR reaction, especially the active sites on the V2O5/TiO2 catalysts, are still a puzzle. Herein, using combined operando spectroscopy and density functional theory calculations, we found that the reactivity of the Lewis acid site was significantly overestimated due to its conversion to the Brønsted acid site. Such interconversion makes it challenging to measure the intrinsic reactivity of different acid sites accurately. In contrast, the abundant V-OH Brønsted acid sites govern the overall NOx reduction rate in realistic exhaust containing water vapor. Moreover, the vanadia species cycle between V5+═O and V4+-OH during NOx reduction, and the re-oxidation of V4+ species to form V5+ is the rate-determining step.
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Affiliation(s)
- Guangyan Xu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Hao Li
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Yunbo Yu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Hong He
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
- University of Chinese Academy of Sciences, Beijing 100049, China
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16
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Zheng W, Zhang X, Zheng Y, Yue Y. "Oxynitride trap" over N/S co-doped graphene-supported catalysts promoting low temperature NH 3-SCR performance: Insight into the structure and mechanisms. JOURNAL OF HAZARDOUS MATERIALS 2022; 423:127187. [PMID: 34560481 DOI: 10.1016/j.jhazmat.2021.127187] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Revised: 08/28/2021] [Accepted: 09/07/2021] [Indexed: 06/13/2023]
Abstract
A series of nitrogen and sulfur (N/S) co-doped graphene supported catalysts (Mn-Ce-SnOx/NSG) were synthesized using an in situ method for enhancing selective catalytic reduction of NOx with NH3 (NH3-SCR) performance. The changes in catalysts' structure, morphology, and active sites were systematically researched to explore the promoting effect of N/S co-doped on catalytic performance. The prepared Mn-Ce-SnOx/NSG-0.3 catalyst achieves an excellent SCR activity at a low temperature, which is comparable to previous graphene-based catalysts. The Ce3+/(Ce3+ + Ce4+), Mn4+/Mn3+, and Oα/(Oα + Oβ) ratios in the catalyst are improved by N/S co-doping, which closely related to excellent SCR activity. Meanwhile, the unpaired electrons on N/S functional groups are effective in promoting the adsorption and further oxidation of gaseous NO. The ability to adsorb NH3 has also been promoted result of numerous Lewis acid sites over Mn-Ce-SnOx/NSG-0.3. In-situ DRIFTS and reaction kinetic results suggest that the Eley-Rideal mechanism should be the most significant pathway in the temperature range of ≥ 200 °C, where coordinated NH3 has higher activity than ionic NH4+. The Langmuir-Hinshelwood (L-H) mechanism is the main route of the low-temperature (L-T) (< 200 °C) SCR reaction. Particularly, the L-T SCR activity improves because the N/S functional groups act as an additional "oxynitride trap" (based on the L-H mechanism).
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Affiliation(s)
- Weijie Zheng
- College of Materials Science and Engineering, Fuzhou University, Fuzhou 350116, PR China
| | - Xiang Zhang
- CAS Key Laboratory of Design and Assembly of Functional Nanostructures, and Fujian Provincial Key Laboratory of Nanomaterials, State Key Laboratory of Structural Chemistry, Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, PR China
| | - Yuying Zheng
- College of Materials Science and Engineering, Fuzhou University, Fuzhou 350116, PR China.
| | - Yuanyuan Yue
- National Engineering Research Center of Chemical Fertilizer Catalyst, College of Chemical Engineering, Fuzhou University, Fuzhou 350002, PR China.
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17
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Insight into the remarkable enhancement of NH3-SCR performance of Ce-Sn oxide catalyst by tungsten modification. Catal Today 2022. [DOI: 10.1016/j.cattod.2022.02.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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18
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Kang H, Wu M, Li S, Wei C, Chen X, Chen J, Jing F, Chu W, Liu Y. Converting Poisonous Sulfate Species to an Active Promoter on TiO 2 Predecorated MnO x Catalysts for the NH 3-SCR Reaction. ACS APPLIED MATERIALS & INTERFACES 2021; 13:61237-61247. [PMID: 34927431 DOI: 10.1021/acsami.1c19625] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
MnOx-based catalysts possess excellent low-temperature NH3 selective catalytic reduction (NH3-SCR) activity, but the poor SO2/sulfate poisoning resistance and the narrow active-temperature window limit their application for NOx removal. Herein, TiO2 nanoparticles and sulfate were successively introduced into MnOx-based catalysts to modulate the NH3-SCR activity, and the active-temperature window (NO conversion above 80%, T80) was significantly broadened to 100-350 °C (SO42--TiO2@MnOx) compared to that of the pristine MnOx catalyst (ca. T80: 100-268 °C). Combined with advanced characterizations and control experiments, it was clearly shown that the poisonous effects of sulfate on the MnOx catalyst could be efficiently inhibited in the presence of TiO2 species due to the interaction between sulfate and TiO2 to form a solid superacid (SO42--TiO2) species as NH3 adsorption sites for the low-temperature process. Furthermore, such solid superacid (SO42--TiO2) species could weaken the redox ability to inhibit the excessive oxidation of NH3 and thus enhance the high-temperature activity significantly. This work not only puts forward the TiO2 predecoration strategy that converts sulfate to a promoter to broaden the active temperature window but also experimentally proves that the requirement of redox ability and acidity in the MnOx-based NH3-SCR catalyst was dependent on the reaction temperature range.
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Affiliation(s)
- Hui Kang
- Department of Chemical Engineering, Sichuan University, Chengdu 610065, China
- Dalian National Laboratory for Clean Energy (DNL), Dalian Institute of Chemical Physics, Chinese Academy of Science, 457 Zhongshan Road, Dalian 116023, China
| | - Mengxia Wu
- Department of Chemical Engineering, Sichuan University, Chengdu 610065, China
| | - Shiyan Li
- Dalian National Laboratory for Clean Energy (DNL), Dalian Institute of Chemical Physics, Chinese Academy of Science, 457 Zhongshan Road, Dalian 116023, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Chunhong Wei
- Department of Chemical Engineering, Sichuan University, Chengdu 610065, China
- Dalian National Laboratory for Clean Energy (DNL), Dalian Institute of Chemical Physics, Chinese Academy of Science, 457 Zhongshan Road, Dalian 116023, China
| | - Xiaoping Chen
- Department of Environment, Tsinghua University, Beijing 100084, PR China
| | - Jianjun Chen
- Department of Environment, Tsinghua University, Beijing 100084, PR China
| | - Fangli Jing
- Department of Chemical Engineering, Sichuan University, Chengdu 610065, China
| | - Wei Chu
- Department of Chemical Engineering, Sichuan University, Chengdu 610065, China
| | - Yuefeng Liu
- Dalian National Laboratory for Clean Energy (DNL), Dalian Institute of Chemical Physics, Chinese Academy of Science, 457 Zhongshan Road, Dalian 116023, China
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19
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Kubota H, Toyao T, Maeno Z, Inomata Y, Murayama T, Nakazawa N, Inagaki S, Kubota Y, Shimizu KI. Analogous Mechanistic Features of NH 3-SCR over Vanadium Oxide and Copper Zeolite Catalysts. ACS Catal 2021. [DOI: 10.1021/acscatal.1c02860] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hiroe Kubota
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo 001-0021, Japan
| | - Takashi Toyao
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo 001-0021, Japan
- Elements Strategy Initiative for Catalysts and Batteries, Kyoto University, Katsura, Kyoto 615-8520, Japan
| | - Zen Maeno
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo 001-0021, Japan
| | - Yusuke Inomata
- Faculty of Advanced Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto 860-8555, Japan
| | - Toru Murayama
- Research Center for Hydrogen Energy-Based Society, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
- Yantai Key Laboratory of Gold Catalysis and Engineering, Shandong Applied Research Center of Gold Nanotechnology (Au-SDARC), School of Chemistry & Chemical Engineering, Yantai University, Yantai 264005, China
| | - Naoto Nakazawa
- Division of Materials Science and Chemical Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
| | - Satoshi Inagaki
- Division of Materials Science and Chemical Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
| | - Yoshihiro Kubota
- Division of Materials Science and Chemical Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
| | - Ken-ichi Shimizu
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo 001-0021, Japan
- Elements Strategy Initiative for Catalysts and Batteries, Kyoto University, Katsura, Kyoto 615-8520, Japan
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20
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Hybrid Cu-Fe/ZSM-5 Catalyst Prepared by Liquid Ion-Exchange for NOx Removal by NH3-SCR Process. J CHEM-NY 2021. [DOI: 10.1155/2021/5552187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A series of Cu/ZSM-5, Fe/ZSM-5, and Cu-Fe/ZSM-5 catalysts (Si/Al in ZSM-5 = 25) were prepared by different metal loadings using the liquid ion-exchange method. Several characterization methods were conducted to explore the effects of metals on the physical and chemical properties of catalysts. Meanwhile, the electron paramagnetic resonance method is also used to assess the copper and/or iron elements’ coordination and valence state at intersections or in channels of ZSM-5. The metal-loading effects of all catalysts on the catalytic activities were studied for the removal of NOx in a fixed-bed flow reactor using selective catalytic reduction with ammonia (NH3-SCR). The results showed that the iron’s addition could markedly broaden the operation temperature range of the Cu/ZSM-5 catalyst for NH3-SCR between 200 and 550°C due to the presence of more isolated Cu2+ ions as well as additional oligomeric Fe3+ active sites and FexOy oligomeric species. This paper gives a facile and straightforward way to synthesize the practical-promising catalyst applied in NH3-SCR technology to control NOx emissions.
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21
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Hu W, Zou R, Dong Y, Zhang Y, Ran M, Xin Q, Yang Y, Song H, Wu W, Liu S, Zheng C, Gao X. Mechanism and Enhancement of the Low-Temperature Selective Catalytic Reduction of NO x with NH 3 by Bifunctional Catalytic Mixtures. Ind Eng Chem Res 2021. [DOI: 10.1021/acs.iecr.0c05214] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Wenshuo Hu
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, China
| | - Renzhi Zou
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, China
| | - Yi Dong
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, China
| | - Yu Zhang
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, China
| | - Mingchu Ran
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, China
| | - Qi Xin
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, China
| | - Yang Yang
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, China
| | - Hao Song
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, China
| | - Weihong Wu
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, China
| | - Shaojun Liu
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, China
| | - Chenghang Zheng
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, China
| | - Xiang Gao
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, China
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22
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Lu Z, Kunisch J, Gan Z, Bunian M, Wu T, Lei Y. Gold Catalysts Synthesized Using a Modified Incipient Wetness Impregnation Method for Propylene Epoxidation. ChemCatChem 2020. [DOI: 10.1002/cctc.202001053] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Zheng Lu
- Department of Chemical and Materials Engineering University of Alabama in Huntsville 301 Sparkman Drive Huntsville AL 35899 USA
| | - Jacob Kunisch
- Department of Chemical and Materials Engineering University of Alabama in Huntsville 301 Sparkman Drive Huntsville AL 35899 USA
| | - Zhuoran Gan
- Department of Chemical and Materials Engineering University of Alabama in Huntsville 301 Sparkman Drive Huntsville AL 35899 USA
| | - Muntaseer Bunian
- Department of Chemical and Materials Engineering University of Alabama in Huntsville 301 Sparkman Drive Huntsville AL 35899 USA
| | - Tianpin Wu
- X-ray Science Division Argonne National Laboratory 9700 South Cass Avenue Lemont IL 60439 USA
| | - Yu Lei
- Department of Chemical and Materials Engineering University of Alabama in Huntsville 301 Sparkman Drive Huntsville AL 35899 USA
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23
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High Surface Area VOx/TiO2/SBA-15 Model Catalysts for Ammonia SCR Prepared by Atomic Layer Deposition. Catalysts 2020. [DOI: 10.3390/catal10121386] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
The mode of operation of titania-supported vanadia (VOx) catalysts for NOx abatement using ammonia selective catalytic reduction (NH3-SCR) is still vigorously debated. We introduce a new high surface area VOx/TiO2/SBA-15 model catalyst system based on mesoporous silica SBA-15 making use of atomic layer deposition (ALD) for controlled synthesis of titania and vanadia multilayers. The bulk and surface structure is characterized by X-ray diffraction (XRD), UV-vis and Raman spectroscopy, as well as X-ray photoelectron spectroscopy (XPS), revealing the presence of dispersed surface VOx species on amorphous TiO2 domains on SBA-15, forming hybrid Si–O–V and Ti–O–V linkages. Temperature-dependent analysis of the ammonia SCR catalytic activity reveals NOx conversion levels of up to ~60%. In situ and operando diffuse reflection IR Fourier transform (DRIFT) spectroscopy shows N–Hstretching modes, representing adsorbed ammonia and -NH2 and -NH intermediate structures on Bronsted and Lewis acid sites. Partial Lewis acid sites with adjacent redox sites are proposed as the active sites and desorption of product molecules as the rate-determining step at low temperature. The high NOx conversion is attributed to the presence of highly dispersed VOx species and the moderate acidity of VOx supported on TiO2/SBA-15.
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24
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Mason MM, Lee ZR, Vasiliu M, Wachs IE, Dixon DA. Initial Steps in the Selective Catalytic Reduction of NO with NH3 by TiO2-Supported Vanadium Oxides. ACS Catal 2020. [DOI: 10.1021/acscatal.0c03693] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Marcos M. Mason
- Department of Chemistry and Biochemistry, The University of Alabama, Shelby Hall, Tuscaloosa Alabama 35487-0336, United States
| | - Zachary R. Lee
- Department of Chemistry and Biochemistry, The University of Alabama, Shelby Hall, Tuscaloosa Alabama 35487-0336, United States
| | - Monica Vasiliu
- Department of Chemistry and Biochemistry, The University of Alabama, Shelby Hall, Tuscaloosa Alabama 35487-0336, United States
| | - Israel E. Wachs
- Operando Molecular Spectroscopy & Catalysis Laboratory, Department of Chemical and Biomolecular Engineering, Lehigh University, Iacocca Hall, Bethlehem Pennsylvania 18015, United States
| | - David A. Dixon
- Department of Chemistry and Biochemistry, The University of Alabama, Shelby Hall, Tuscaloosa Alabama 35487-0336, United States
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25
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Wang X, Du X, Xue J, Yang G, Chen Y, Zhang L. New insights into the N2O formation mechanism during selective catalytic reduction of NO with NH3 over V-based catalyst. Catal Today 2020. [DOI: 10.1016/j.cattod.2019.06.052] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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26
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Godiksen AL, Funk MH, Rasmussen SB, Mossin S. Assessing the Importance of V(IV) During NH
3
−SCR Using
Operando
EPR Spectroscopy. ChemCatChem 2020. [DOI: 10.1002/cctc.202000802] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
| | - Marie H. Funk
- Centre for Catalysis and Sustainable Chemistry DTU Chemistry Technical University of Denmark Kemitorvet 207 2800 Kgs. Lyngby Denmark
| | | | - Susanne Mossin
- Centre for Catalysis and Sustainable Chemistry DTU Chemistry Technical University of Denmark Kemitorvet 207 2800 Kgs. Lyngby Denmark
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27
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Kuma R, Kitano T, Tsujiguchi T, Tanaka T. In Situ XANES Characterization of V 2O 5/TiO 2–SiO 2–MoO 3 Catalyst for Selective Catalytic Reduction of NO by NH 3. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.0c02308] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ryoji Kuma
- New Energy Materials Research Department, Nippon Shokubai Company Ltd., Himeji, Hyogo 671-1292, Japan
| | - Tomoyuki Kitano
- Analysis Technology Center, Nippon Shokubai Company Ltd., Suita, Osaka 564-0034, Japan
| | - Takuya Tsujiguchi
- New Energy Materials Research Department, Nippon Shokubai Company Ltd., Himeji, Hyogo 671-1292, Japan
| | - Tsunehiro Tanaka
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
- Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University, Kyoto 615-8510, Japan
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28
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Zhao Z, Li E, Qin Y, Liu X, Zou Y, Wu H, Zhu T. Density functional theory (DFT) studies of vanadium-titanium based selective catalytic reduction (SCR) catalysts. J Environ Sci (China) 2020; 90:119-137. [PMID: 32081309 DOI: 10.1016/j.jes.2019.11.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Revised: 11/01/2019] [Accepted: 11/13/2019] [Indexed: 06/10/2023]
Abstract
Based on density functional theory (DFT) and basic structure models, the chemical reactions on the surface of vanadium-titanium based selective catalytic reduction (SCR) denitrification catalysts were summarized. Reasonable structural models (non-periodic and periodic structural models) are the basis of density functional calculations. A periodic structure model was more appropriate to represent the catalyst surface, and its theoretical calculation results were more comparable with the experimental results than a non-periodic model. It is generally believed that the SCR mechanism where NH3 and NO react to produce N2 and H2O follows an Eley-Rideal type mechanism. NH2NO was found to be an important intermediate in the SCR reaction, with multiple production routes. Simultaneously, the effects of H2O, SO2 and metal on SCR catalysts were also summarized.
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Affiliation(s)
- Ziwei Zhao
- National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Erwei Li
- National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Yu Qin
- State Key Laboratory of Solid Waste Reuse for Building Materials, Beijing Building Materials Academy of Science Research, Beijing 100041, China
| | - Xiaolong Liu
- National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.
| | - Yang Zou
- National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Heng Wu
- National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Tingyu Zhu
- National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
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29
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Yan T, Liu Q, Wang S, Xu G, Wu M, Chen J, Li J. Promoter rather than Inhibitor: Phosphorus Incorporation Accelerates the Activity of V2O5–WO3/TiO2 Catalyst for Selective Catalytic Reduction of NOx by NH3. ACS Catal 2020. [DOI: 10.1021/acscatal.9b05549] [Citation(s) in RCA: 53] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Tao Yan
- State Key Joint Laboratory of Environment Simulation and Pollution Control; National Engineering Laboratory for Multi Flue Gas Pollution Control Technology and Equipment, School of Environment, Tsinghua University, Beijing, 100084, PR China
| | - Qi Liu
- State Key Joint Laboratory of Environment Simulation and Pollution Control; National Engineering Laboratory for Multi Flue Gas Pollution Control Technology and Equipment, School of Environment, Tsinghua University, Beijing, 100084, PR China
- Shanghai Applied Radiation Institute, Shanghai University, Shanghai 200444, China
| | - Shihao Wang
- State Key Joint Laboratory of Environment Simulation and Pollution Control; National Engineering Laboratory for Multi Flue Gas Pollution Control Technology and Equipment, School of Environment, Tsinghua University, Beijing, 100084, PR China
- Shanghai Applied Radiation Institute, Shanghai University, Shanghai 200444, China
| | - Gang Xu
- Shanghai Applied Radiation Institute, Shanghai University, Shanghai 200444, China
| | - Minghong Wu
- Shanghai Applied Radiation Institute, Shanghai University, Shanghai 200444, China
| | - Jianjun Chen
- State Key Joint Laboratory of Environment Simulation and Pollution Control; National Engineering Laboratory for Multi Flue Gas Pollution Control Technology and Equipment, School of Environment, Tsinghua University, Beijing, 100084, PR China
| | - Junhua Li
- State Key Joint Laboratory of Environment Simulation and Pollution Control; National Engineering Laboratory for Multi Flue Gas Pollution Control Technology and Equipment, School of Environment, Tsinghua University, Beijing, 100084, PR China
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30
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Song I, Lee H, Jeon SW, Kim DH. Understanding the dynamic behavior of acid sites on TiO2-supported vanadia catalysts via operando DRIFTS under SCR-relevant conditions. J Catal 2020. [DOI: 10.1016/j.jcat.2019.12.041] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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31
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Preparation of Quasi-MIL-101(Cr) Loaded Ceria Catalysts for the Selective Catalytic Reduction of NOx at Low Temperature. Catalysts 2020. [DOI: 10.3390/catal10010140] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
At present, the development of novel catalysts with high activity Selective Catalytic Reduction (SCR) reaction at the low temperature is still a challenge. In this work, the authors prepare CeO2/quasi-MIL-101 catalysts with various amounts of deposited ceria by a double-solvent method, which are characterized by X-ray diffraction (XRD), Fourier Transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and so on. The results show that the increase of Ce content has a great influence on the catalytic property of the catalyst. The introduction of Ce can promote the conversion between Cr3+ and Cr5+ and increase the proportion of lattice oxygen, which improves the activity of the catalyst. However, the catalyst will be peroxidized when the content of Ce is too high, resulting in the decline of the catalytic activity. This experiment indicates that CeO2/quasi-MIL-101 plays a significant role in the NH3-SCR process at the low temperature when the loading of Ce is 0.5%. This work has proved the potential of this kind of material in NH3-SCR process at the low temperature, providing help for subsequent studies.
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Yue Y, Liu B, Lv N, Wang T, Bi X, Zhu H, Yuan P, Bai Z, Cui Q, Bao X. Direct Synthesis of Hierarchical FeCu‐ZSM‐5 Zeolite with Wide Temperature Window in Selective Catalytic Reduction of NO by NH
3. ChemCatChem 2019. [DOI: 10.1002/cctc.201901104] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Yuanyuan Yue
- National Engineering Research Center of Chemical Fertilizer Catalyst College of Chemical EngineeringFuzhou University Fuzhou 350002 P.R. China
| | - Ben Liu
- National Engineering Research Center of Chemical Fertilizer Catalyst College of Chemical EngineeringFuzhou University Fuzhou 350002 P.R. China
| | - Nangui Lv
- National Engineering Research Center of Chemical Fertilizer Catalyst College of Chemical EngineeringFuzhou University Fuzhou 350002 P.R. China
| | - Tinghai Wang
- National Engineering Research Center of Chemical Fertilizer Catalyst College of Chemical EngineeringFuzhou University Fuzhou 350002 P.R. China
| | - Xiaotao Bi
- National Engineering Research Center of Chemical Fertilizer Catalyst College of Chemical EngineeringFuzhou University Fuzhou 350002 P.R. China
- Department of Chemical & Biological EngineeringUniversity of British Columbia Vancouver BC V6T 1Z3 Canada
| | - Haibo Zhu
- National Engineering Research Center of Chemical Fertilizer Catalyst College of Chemical EngineeringFuzhou University Fuzhou 350002 P.R. China
| | - Pei Yuan
- National Engineering Research Center of Chemical Fertilizer Catalyst College of Chemical EngineeringFuzhou University Fuzhou 350002 P.R. China
| | - Zhengshuai Bai
- State Key Laboratory of Photocatalysis on Energy & Environment College of ChemistryFuzhou University Fuzhou 350116 P.R. China
| | - Qingyan Cui
- National Engineering Research Center of Chemical Fertilizer Catalyst College of Chemical EngineeringFuzhou University Fuzhou 350002 P.R. China
| | - Xiaojun Bao
- National Engineering Research Center of Chemical Fertilizer Catalyst College of Chemical EngineeringFuzhou University Fuzhou 350002 P.R. China
- State Key Laboratory of Photocatalysis on Energy & Environment College of ChemistryFuzhou University Fuzhou 350116 P.R. China
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Jaegers NR, Lai J, He Y, Walter E, Dixon DA, Vasiliu M, Chen Y, Wang C, Hu MY, Mueller KT, Wachs IE, Wang Y, Hu JZ. Mechanism by which Tungsten Oxide Promotes the Activity of Supported V
2
O
5
/TiO
2
Catalysts for NO
X
Abatement: Structural Effects Revealed by
51
V MAS NMR Spectroscopy. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201904503] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Nicholas R. Jaegers
- Institute for Integrated Catalysis and Earth and Biological Science Directorate Pacific Northwest National Laboratory Richland WA 99354 USA
- Voiland School of Chemical Engineering and Bioengineering Washington State University Pullman WA 99163 USA
| | - Jun‐Kun Lai
- OperandoMolecular Spectroscopy & Catalysis Laboratory Lehigh University Bethlehem PA 18015 USA
| | - Yang He
- Institute for Integrated Catalysis and Earth and Biological Science Directorate Pacific Northwest National Laboratory Richland WA 99354 USA
| | - Eric Walter
- Institute for Integrated Catalysis and Earth and Biological Science Directorate Pacific Northwest National Laboratory Richland WA 99354 USA
| | - David A. Dixon
- Department of Chemistry The University of Alabama Tuscaloosa AL 35487 USA
| | - Monica Vasiliu
- Department of Chemistry The University of Alabama Tuscaloosa AL 35487 USA
| | - Ying Chen
- Institute for Integrated Catalysis and Earth and Biological Science Directorate Pacific Northwest National Laboratory Richland WA 99354 USA
| | - Chongmin Wang
- Institute for Integrated Catalysis and Earth and Biological Science Directorate Pacific Northwest National Laboratory Richland WA 99354 USA
| | - Mary Y. Hu
- Institute for Integrated Catalysis and Earth and Biological Science Directorate Pacific Northwest National Laboratory Richland WA 99354 USA
| | - Karl T. Mueller
- Institute for Integrated Catalysis and Earth and Biological Science Directorate Pacific Northwest National Laboratory Richland WA 99354 USA
| | - Israel E. Wachs
- OperandoMolecular Spectroscopy & Catalysis Laboratory Lehigh University Bethlehem PA 18015 USA
| | - Yong Wang
- Institute for Integrated Catalysis and Earth and Biological Science Directorate Pacific Northwest National Laboratory Richland WA 99354 USA
- Voiland School of Chemical Engineering and Bioengineering Washington State University Pullman WA 99163 USA
| | - Jian Zhi Hu
- Institute for Integrated Catalysis and Earth and Biological Science Directorate Pacific Northwest National Laboratory Richland WA 99354 USA
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34
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Jaegers NR, Lai J, He Y, Walter E, Dixon DA, Vasiliu M, Chen Y, Wang C, Hu MY, Mueller KT, Wachs IE, Wang Y, Hu JZ. Mechanism by which Tungsten Oxide Promotes the Activity of Supported V
2
O
5
/TiO
2
Catalysts for NO
X
Abatement: Structural Effects Revealed by
51
V MAS NMR Spectroscopy. Angew Chem Int Ed Engl 2019; 58:12609-12616. [DOI: 10.1002/anie.201904503] [Citation(s) in RCA: 67] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Indexed: 11/09/2022]
Affiliation(s)
- Nicholas R. Jaegers
- Institute for Integrated Catalysis and Earth and Biological Science Directorate Pacific Northwest National Laboratory Richland WA 99354 USA
- Voiland School of Chemical Engineering and Bioengineering Washington State University Pullman WA 99163 USA
| | - Jun‐Kun Lai
- OperandoMolecular Spectroscopy & Catalysis Laboratory Lehigh University Bethlehem PA 18015 USA
| | - Yang He
- Institute for Integrated Catalysis and Earth and Biological Science Directorate Pacific Northwest National Laboratory Richland WA 99354 USA
| | - Eric Walter
- Institute for Integrated Catalysis and Earth and Biological Science Directorate Pacific Northwest National Laboratory Richland WA 99354 USA
| | - David A. Dixon
- Department of Chemistry The University of Alabama Tuscaloosa AL 35487 USA
| | - Monica Vasiliu
- Department of Chemistry The University of Alabama Tuscaloosa AL 35487 USA
| | - Ying Chen
- Institute for Integrated Catalysis and Earth and Biological Science Directorate Pacific Northwest National Laboratory Richland WA 99354 USA
| | - Chongmin Wang
- Institute for Integrated Catalysis and Earth and Biological Science Directorate Pacific Northwest National Laboratory Richland WA 99354 USA
| | - Mary Y. Hu
- Institute for Integrated Catalysis and Earth and Biological Science Directorate Pacific Northwest National Laboratory Richland WA 99354 USA
| | - Karl T. Mueller
- Institute for Integrated Catalysis and Earth and Biological Science Directorate Pacific Northwest National Laboratory Richland WA 99354 USA
| | - Israel E. Wachs
- OperandoMolecular Spectroscopy & Catalysis Laboratory Lehigh University Bethlehem PA 18015 USA
| | - Yong Wang
- Institute for Integrated Catalysis and Earth and Biological Science Directorate Pacific Northwest National Laboratory Richland WA 99354 USA
- Voiland School of Chemical Engineering and Bioengineering Washington State University Pullman WA 99163 USA
| | - Jian Zhi Hu
- Institute for Integrated Catalysis and Earth and Biological Science Directorate Pacific Northwest National Laboratory Richland WA 99354 USA
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35
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Li X, Yao D, Wu F, Wang X, Wei L, Liu B. New Findings in Hydrothermal Deactivation Research on the Vanadia-Selective Catalytic Reduction Catalyst. ACS OMEGA 2019; 4:5088-5097. [PMID: 31459686 PMCID: PMC6648397 DOI: 10.1021/acsomega.8b03572] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Accepted: 02/20/2019] [Indexed: 06/10/2023]
Abstract
Considering the risks of hydrothermal deterioration in vehicles, power plants, and oceangoing vessels, V2O5-WO3/TiO2 catalysts were subject to hydrothermal and thermal aging at 600, 625, 635, and 650 °C for 4-48 h. The different ratio and significant loss of active sites are main reasons for catalyst deactivation. Both Lewis and Brønsted acid sites are involved in the selective catalytic reduction reaction. Brønsted acid sites are more susceptible. High temperature plays a major role in the aging. It causes sintering, particle growth, and the anatase phase transition. Phase transformation turns out to be less important than sintering. Sintering leads to the reduction of the BET surface area, which in turn causes decrease of NH3 adsorption amount and changes of active sites. Aging time can accelerate the degree of deactivation. It also helps to change the proportion of active sites. Water vapor has no significant effect on NO X conversion rates.
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Affiliation(s)
- Xingwen Li
- Institute
of Power Machinery and Vehicular Engineering, College of Energy Engineering, Zhejiang University, Zheda Road 38, Xihu District, Hangzhou 310027, China
| | - Dongwei Yao
- Institute
of Power Machinery and Vehicular Engineering, College of Energy Engineering, Zhejiang University, Zheda Road 38, Xihu District, Hangzhou 310027, China
| | - Feng Wu
- Institute
of Power Machinery and Vehicular Engineering, College of Energy Engineering, Zhejiang University, Zheda Road 38, Xihu District, Hangzhou 310027, China
| | - Xinlei Wang
- Agricultural
Engr Sciences, Bld 1304
W. Pennsylvania, Urbana, Illinois 61801, United
States
| | - Lai Wei
- Institute
of Power Machinery and Vehicular Engineering, College of Energy Engineering, Zhejiang University, Zheda Road 38, Xihu District, Hangzhou 310027, China
| | - Biao Liu
- Institute
of Power Machinery and Vehicular Engineering, College of Energy Engineering, Zhejiang University, Zheda Road 38, Xihu District, Hangzhou 310027, China
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36
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He G, Lian Z, Yu Y, Yang Y, Liu K, Shi X, Yan Z, Shan W, He H. Polymeric vanadyl species determine the low-temperature activity of V-based catalysts for the SCR of NO x with NH 3. SCIENCE ADVANCES 2018; 4:eaau4637. [PMID: 30515455 PMCID: PMC6269159 DOI: 10.1126/sciadv.aau4637] [Citation(s) in RCA: 133] [Impact Index Per Article: 22.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2018] [Accepted: 10/29/2018] [Indexed: 05/14/2023]
Abstract
The structure of dispersed vanadyl species plays a crucial role in the selective catalytic reduction (SCR) of NO with NH3 over vanadia-based catalysts. Here, we demonstrate that the polymeric vanadyl species have a markedly higher NH3-SCR activity than the monomeric vanadyl species. The coupling effect of the polymeric structure not only shortens the reaction pathway for the regeneration of redox sites but also substantially reduces the overall reaction barrier of the catalytic cycle. Therefore, it is the polymeric vanadyl species, rather than the monomeric vanadyl species, that determine the NH3-SCR activity of vanadia-based catalysts, especially under low-temperature conditions. The polymeric vanadia-based SCR mechanism reported here advances the understanding of the working principle of vanadia-based catalysts and paves the way toward the development of low vanadium-loading SCR catalysts with excellent low-temperature activity.
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Affiliation(s)
- Guangzhi He
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Zhihua Lian
- Center for Excellence in Regional Atmospheric Environment and Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
| | - Yunbo Yu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- Center for Excellence in Regional Atmospheric Environment and Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yang Yang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Kuo Liu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- Editorial Office of Journal of Environmental Sciences, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Xiaoyan Shi
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zidi Yan
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Wenpo Shan
- Center for Excellence in Regional Atmospheric Environment and Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
| | - Hong He
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- Center for Excellence in Regional Atmospheric Environment and Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
- University of Chinese Academy of Sciences, Beijing 100049, China
- Corresponding author.
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37
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Zhang J, Li X, Chen P, Zhu B. Research Status and Prospect on Vanadium-Based Catalysts for NH₃-SCR Denitration. MATERIALS 2018; 11:ma11091632. [PMID: 30200596 PMCID: PMC6164654 DOI: 10.3390/ma11091632] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Revised: 09/01/2018] [Accepted: 09/03/2018] [Indexed: 01/27/2023]
Abstract
Selective catalytic reduction of NOx with NH3 is one of the most widely used technologies in denitration. Vanadium-based catalysts have been extensively studied for the deNOx process. V2O5/WO3(MoO3)TiO2 as a commercial catalyst has excellent catalytic activity in the medium temperature range. However, it has usually faced several problems in practical industrial applications, including narrow windows of operation temperatures, and the deactivation of catalysts. The modification of vanadium-based catalysts will be the focus in future research. In this paper, the chemical composition of vanadium-based catalysts, catalytic mechanism, the broadening of the temperature range, and the improvement of erosion resistance are reviewed. Furthermore, the effects of four major systems of copper, iron, cerium and manganese on the modification of vanadium-based catalysts are introduced and analyzed. It is worth noting that the addition of modified elements as promoters has greatly improved the catalytic performance. They can enhance the surface acidity, which leads to the increasing adsorption capacity of NH3. Surface defects and oxygen vacancies have also been increased, resulting in more active sites. Finally, the future development of vanadium-based catalysts for denitration is prospected. It is indicated that the main purpose for the research of vanadium-based modification will help to obtain safe, environmentally friendly, efficient, and economical catalysts.
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Affiliation(s)
- Jie Zhang
- The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China.
| | - Xiangcheng Li
- The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China.
| | - Pingan Chen
- The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China.
| | - Boquan Zhu
- The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China.
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38
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Mu J, Li X, Sun W, Fan S, Wang X, Wang L, Qin M, Gan G, Yin Z, Zhang D. Inductive Effect Boosting Catalytic Performance of Advanced Fe1–xVxOδ Catalysts in Low-Temperature NH3 Selective Catalytic Reduction: Insight into the Structure, Interaction, and Mechanisms. ACS Catal 2018. [DOI: 10.1021/acscatal.8b01196] [Citation(s) in RCA: 90] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jincheng Mu
- 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
| | - 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
| | - Wenbo Sun
- 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
| | - Shiying Fan
- 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
| | - Xinyang Wang
- 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
| | - Liang Wang
- 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
| | - Meichun Qin
- 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
| | - Guoqiang Gan
- 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
| | - Zhifan Yin
- 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
| | - Dongke Zhang
- Centre for Energy (M473), The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia
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Li C, Shen M, Wang J, Wang J, Zhai Y. New Insights into the Role of WO3 in Improved Activity and Ammonium Bisulfate Resistance for NO Reduction with NH3 over V–W/Ce/Ti Catalyst. Ind Eng Chem Res 2018. [DOI: 10.1021/acs.iecr.8b01031] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Chenxu Li
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072, PR China
| | - Meiqing Shen
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072, PR China
- Collaborative
Innovation Center of Chemical Science and Engineering, Tianjin 300072, PR China
- State Key Laboratory of Engines, Tianjin University, Tianjin 300072, PR China
| | - Jianqiang Wang
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072, PR China
| | - Jun Wang
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072, PR China
| | - Yanping Zhai
- China Huadian Science and Technology Institute, Beijing 100070, PR China
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40
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Lai JK, Wachs IE. A Perspective on the Selective Catalytic Reduction (SCR) of NO with NH3 by Supported V2O5–WO3/TiO2 Catalysts. ACS Catal 2018. [DOI: 10.1021/acscatal.8b01357] [Citation(s) in RCA: 244] [Impact Index Per Article: 40.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jun-Kun Lai
- Operando Molecular Spectroscopy & Catalysis Laboratory, Department of Chemical and Biomolecular Engineering, Lehigh University, Bethlehem, Pennsylvania 18015, United States
| | - Israel E. Wachs
- Operando Molecular Spectroscopy & Catalysis Laboratory, Department of Chemical and Biomolecular Engineering, Lehigh University, Bethlehem, Pennsylvania 18015, United States
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