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Support effects on the dispersion and interaction of Ce and W species for NH3-SCR. MOLECULAR CATALYSIS 2022. [DOI: 10.1016/j.mcat.2022.112284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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2
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Xie S, Qin Q, Liu H, Jin L, Wei X, Liu J, Liu X, Yao Y, Dong L, Li B. MOF-74-M (M = Mn, Co, Ni, Zn, MnCo, MnNi, and MnZn) for Low-Temperature NH 3-SCR and In Situ DRIFTS Study Reaction Mechanism. ACS APPLIED MATERIALS & INTERFACES 2020; 12:48476-48485. [PMID: 33048536 DOI: 10.1021/acsami.0c11035] [Citation(s) in RCA: 41] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Monometallic and bimetallic MOF-74-M (M = Mn, Co, Ni, Zn, MnCo, MnNi, and MnZn) catalysts were prepared by the solvothermal method for NH3-SCR. XRD, BET, SEM, and EDS-mapping tests indicate the successful synthesis of the MOF-74-M catalyst with uniform distribution of metal elements and large specific surface area, and the morphology is almost hexagonal. Adding Mn element to a single-metal catalyst can enhance activity, which is mainly because of the existence of various valence states of Mn so that it has excellent redox properties; the catalytic activity of water and sulfur resistance tests showed that the catalytic activity of MOF-74-M increases after adding a proper amount of SO2, mainly because of the increase in acidic sites. In situ DRIFTS results indicate that the low-temperature range of MOF-74-MnCo and MOF-74-Mn is dominated by the E-R mechanism and the high-temperature range is dominated by the L-H mechanism. The entire temperature range of MOF-74-Zn is dominated by the L-H mechanism.
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Affiliation(s)
- Shangzhi Xie
- Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, PR China
| | - Qiuju Qin
- Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, PR China
| | - Hao Liu
- Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, PR China
| | - Lijian Jin
- Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, PR China
| | - Xiaoling Wei
- Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, PR China
| | - Jiaxing Liu
- Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, PR China
| | - Xia Liu
- Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, PR China
| | - Yinchao Yao
- Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, PR China
| | - Lihui Dong
- Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, PR China
| | - Bin Li
- Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, PR China
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Sb-Containing Metal Oxide Catalysts for the Selective Catalytic Reduction of NOx with NH3. Catalysts 2020. [DOI: 10.3390/catal10101154] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Sb-containing catalysts (SbZrOx (SbZr), SbCeOx (SbCe), SbCeZrOx (SbCeZr)) were prepared by citric acid method and investigated for the selective catalytic reduction (SCR) of NOx with NH3 (NH3-SCR). SbCeZr outperformed SbZr and SbCe and exhibited the highest activity with 80% NO conversion in the temperature window of 202–422 °C. Meanwhile, it also had good thermal stability and resistance against H2O and SO2. Various characterization methods, such as XRD, XPS, H2-TPR, NH3-TPD, and in situ diffuse reflectance infrared Fourier transform (DRIFT), were applied to understand their different behavior in NOx removal. The presence of Sb in the metal oxides led to the difference in acid distribution and redox property, which closely related with the NH3 adsorption and NO oxidation. Brønsted acid and Lewis acid were evenly distributed on SbCe, while Brønsted acid dominated on SbCeZr. Compared with Brønsted acid, Lewis acid was slightly active in NH3-SCR. The competition between NH3 adsorption and NO oxidation was dependent on SbOx and metal oxides, which were found on SbCe while not on SbCeZr.
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Liu S, Zhang R, Li P, Chen H, Wei Y, Liang X. Morphology effect of diverse ceria with active tungsten species on NH3-SCR behaviors. Catal Today 2020. [DOI: 10.1016/j.cattod.2019.02.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Wang X, Liu Y, Yao W, Wu Z. Boosting the low-temperature activity and sulfur tolerance of CeZr 2O x catalysts by antimony addition for the selective catalytic reduction of NO with ammonia. J Colloid Interface Sci 2019; 546:152-162. [PMID: 30913489 DOI: 10.1016/j.jcis.2019.03.031] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Revised: 03/05/2019] [Accepted: 03/10/2019] [Indexed: 11/26/2022]
Abstract
In this paper, a series of Sb modified CeZr2Ox mixed oxides (SbyCZ) were synthesized by citrate method for the selective catalytic reduction of NO with ammonia (NH3-SCR). Experimental results exhibited that the Sb addition could bring a great improvement of SCR activity at 200-360 °C owing to the enhancement in surface area, redox ability and surface acidity. More importantly, the sulfur tolerance of the catalyst with proper Sb loading contents was dramatically improved. For instance, above 85% deNOx efficiency was retained over Sb0.5CZ catalyst after 24 h reaction in the presence of 100 ppm SO2 and 5 vol.% H2O. As for pure CeZr2Ox and the catalysts with low Sb loading contents, the serious accumulation of ammonium sulfates resulted in the deactivation after SO2 exposure. However, with excessive Sb addition, more labile oxygen readily reacted with SO2 and the redox cycle was then disrupted, leading to the decrease of SCR activity. With an appropriate Sb loading contents, the sulfate species preferentially formed around Sb cations could restrain the further consumption of oxygen species in Ce-O-Ce or Ce-O-Zr mode by SO2 via a space confinement effect. Thus, a certain amount of labile oxygen was preserved to drive the SCR reaction, thereby enhancing the sulfur tolerance of the catalyst.
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Affiliation(s)
- Xiaoqiang Wang
- Department of Environmental Engineering, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, PR China
| | - Yue Liu
- Department of Environmental Engineering, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, PR China.
| | - Weiyuan Yao
- Department of Environmental Engineering, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, PR China
| | - Zhongbiao Wu
- Department of Environmental Engineering, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, PR China; Zhejiang Provincial Engineering Research Center of Industrial Boiler & Furnace Flue Gas Pollution Control, 866 Yuhangtang Road, Hangzhou 310058, PR China
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Negri C, Borfecchia E, Cutini M, Lomachenko KA, Janssens TVW, Berlier G, Bordiga S. Evidence of Mixed‐Ligand Complexes in Cu−CHA by Reaction of Cu Nitrates with NO/NH
3
at Low Temperature. ChemCatChem 2019. [DOI: 10.1002/cctc.201900590] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Chiara Negri
- Department of Chemistry, NIS Centre and INSTM Reference CenterUniversity of Turin Via Giuria 7 Turin 10125 Italy
| | - Elisa Borfecchia
- Department of Chemistry, NIS Centre and INSTM Reference CenterUniversity of Turin Via Giuria 7 Turin 10125 Italy
| | - Michele Cutini
- Department of Chemistry, NIS Centre and INSTM Reference CenterUniversity of Turin Via Giuria 7 Turin 10125 Italy
| | - Kirill A. Lomachenko
- European Synchrotron Radiation Facility 71 Avenue des Martyrs, CS 40220 Grenoble Cedex 9 38043 France
| | | | - Gloria Berlier
- Department of Chemistry, NIS Centre and INSTM Reference CenterUniversity of Turin Via Giuria 7 Turin 10125 Italy
| | - Silvia Bordiga
- Department of Chemistry, NIS Centre and INSTM Reference CenterUniversity of Turin Via Giuria 7 Turin 10125 Italy
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Xu J, Yu H, Zhang C, Guo F, Xie J. Development of cerium-based catalysts for selective catalytic reduction of nitrogen oxides: a review. NEW J CHEM 2019. [DOI: 10.1039/c8nj05420g] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Nitrogen oxides (NOX) are major pollutants of the atmosphere, and selective catalytic reduction of nitrogen oxides using ammonia as a reductant (NH3-SCR) is an effective method to remove nitrogen oxides.
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Affiliation(s)
- Junqiang Xu
- College of Chemistry and Chemical Engineering
- Chongqing University of Technology
- Chongqing 400054
- China
| | - Haijie Yu
- College of Chemistry and Chemical Engineering
- Chongqing University of Technology
- Chongqing 400054
- China
| | - Chuan Zhang
- College of Chemistry and Chemical Engineering
- Chongqing University of Technology
- Chongqing 400054
- China
| | - Fang Guo
- College of Chemistry and Chemical Engineering
- Chongqing University of Technology
- Chongqing 400054
- China
| | - Jiaqing Xie
- College of Chemical and Environmental Engineering
- Sichuan University of Technology
- Zigong 643000
- China
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Zhang B, Liebau M, Suprun W, Liu B, Zhang S, Gläser R. Suppression of N2O formation by H2O and SO2 in the selective catalytic reduction of NO with NH3 over a Mn/Ti–Si catalyst. Catal Sci Technol 2019. [DOI: 10.1039/c9cy01156k] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Proposed mechanism of NO reduction and N2O formation as well as H2O/SO2 suppression effects with participation of (a) Lewis acid sites and (b) Brønsted acid sites over a Mn/Ti–Si catalyst.
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Affiliation(s)
- Bolin Zhang
- Institute for Advanced Materials and Technology
- University of Science and Technology Beijing
- 100083 Beijing
- China
- Institute of Chemical Technology
| | - Michael Liebau
- Institute of Chemical Technology
- Universität Leipzig
- 04103 Leipzig
- Germany
| | - Wladimir Suprun
- Institute of Chemical Technology
- Universität Leipzig
- 04103 Leipzig
- Germany
| | - Bo Liu
- Institute for Advanced Materials and Technology
- University of Science and Technology Beijing
- 100083 Beijing
- China
| | - Shengen Zhang
- Institute for Advanced Materials and Technology
- University of Science and Technology Beijing
- 100083 Beijing
- China
| | - Roger Gläser
- Institute of Chemical Technology
- Universität Leipzig
- 04103 Leipzig
- Germany
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Gao Y, Wu X, Nord R, Härelind H, Weng D. Sulphation and ammonia regeneration of a Pt/MnOx–CeO2/Al2O3 catalyst for NOx-assisted soot oxidation. Catal Sci Technol 2018. [DOI: 10.1039/c8cy00027a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Sulphates deposited on the catalysts can be reduced by ammonia with the catalysis of Pt during CDPF regeneration.
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Affiliation(s)
- Yuxi Gao
- Key Laboratory of Advanced Materials of Ministry of Education of China
- School of Materials Science and Engineering
- Tsinghua University
- Beijing 100084
- China
| | - Xiaodong Wu
- Key Laboratory of Advanced Materials of Ministry of Education of China
- School of Materials Science and Engineering
- Tsinghua University
- Beijing 100084
- China
| | - Robin Nord
- Competence Centre for Catalysis
- Department of Chemistry and Chemical Engineering
- Chalmers University of Technology
- SE-412 96 Gothenburg
- Sweden
| | - Hanna Härelind
- Competence Centre for Catalysis
- Department of Chemistry and Chemical Engineering
- Chalmers University of Technology
- SE-412 96 Gothenburg
- Sweden
| | - Duan Weng
- Key Laboratory of Advanced Materials of Ministry of Education of China
- School of Materials Science and Engineering
- Tsinghua University
- Beijing 100084
- China
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