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Zhang N, Tong J, Miyazaki S, Zhao S, Kubota H, Jing Y, Mine S, Toyao T, Shimizu KI. Mechanism of NH 3-SCR over P/CeO 2 Catalysts Investigated by Operando Spectroscopies. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:16289-16295. [PMID: 37861445 DOI: 10.1021/acs.est.3c05787] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2023]
Abstract
This study reports a comprehensive investigation into the active sites and reaction mechanism for the selective catalytic reduction of NO by NH3 (NH3-SCR) over phosphate-loaded ceria (P/CeO2). Catalyst characterization and density functional theory calculations reveal that H3PO4 and H2P2O6 species are the dominant phosphate species on the P/CeO2 catalysts under the experimental conditions. The reduction/oxidation half-cycles (RHC/OHC) were investigated using in situ X-ray absorption near-edge structure for Ce L3-edge, ultraviolet-visible, and infrared (IR) spectroscopies together with online analysis of outlet products (operando spectroscopy). The Ce4+(OH-) species, possibly adjacent to the phosphate species, are reduced by NO + NH3 to produce N2, H2O, and Ce3+ species (RHC). The Ce3+ species is reoxidized by aqueous O2 (OHC). The results from IR spectroscopy suggest that the RHC initiates with the reaction between NO and Ce4+(OH-) to yield Ce3+ and gaseous HONO, which then react with NH3 to produce N2 and H2O via NH4NO2 intermediates.
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Affiliation(s)
- Ningqiang Zhang
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo 001-0021, Japan
| | - Jiahuan Tong
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo 001-0021, Japan
| | - Shinta Miyazaki
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo 001-0021, Japan
| | - Shirun Zhao
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo 001-0021, Japan
| | - Hiroe Kubota
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo 001-0021, Japan
| | - Yuan Jing
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo 001-0021, Japan
| | - Shinya Mine
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo 001-0021, Japan
- National Institute of Advanced Industrial Science and Technology (AIST), Research Institute for Chemical Process Technology, 4-2-1 Nigatake, Miyagino, Sendai 983-8551, Japan
| | - Takashi Toyao
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo 001-0021, Japan
| | - Ken-Ichi Shimizu
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo 001-0021, Japan
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2
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Lei H, Chen D, Yang JY, Khetan A, Jiang J, Peng B, Simon U, Ye D, Chen P. Revealing the Formation and Reactivity of Cage-Confined Cu Pairs in Catalytic NO x Reduction over Cu-SSZ-13 Zeolites by In Situ UV-Vis Spectroscopy and Time-Dependent DFT Calculation. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:12465-12475. [PMID: 37556316 DOI: 10.1021/acs.est.3c00458] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/11/2023]
Abstract
The low-temperature mechanism of chabazite-type small-pore Cu-SSZ-13 zeolite, a state-of-the-art catalyst for ammonia-assisted selective reduction (NH3-SCR) of toxic NOx pollutants from heavy-duty vehicles, remains a debate and needs to be clarified for further improvement of NH3-SCR performance. In this study, we established experimental protocols to follow the dynamic redox cycling (i.e., CuII ↔ CuI) of Cu sites in Cu-SSZ-13 during low-temperature NH3-SCR catalysis by in situ ultraviolet-visible spectroscopy and in situ infrared spectroscopy. Further integrating the in situ spectroscopic observations with time-dependent density functional theory calculations allows us to identify two cage-confined transient states, namely, the O2-bridged Cu dimers (i.e., μ-η2:η2-peroxodiamino dicopper) and the proximately paired, chemically nonbonded CuI(NH3)2 sites, and to confirm the CuI(NH3)2 pair as a precursor to the O2-bridged Cu dimer. Comparative transient experiments reveal a particularly high reactivity of the CuI(NH3)2 pairs for NO-to-N2 reduction at low temperatures. Our study demonstrates direct experimental evidence for the transient formation and high reactivity of proximately paired CuI sites under zeolite confinement and provides new insights into the monomeric-to-dimeric Cu transformation for completing the Cu redox cycle in low-temperature NH3-SCR catalysis over Cu-SSZ-13.
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Affiliation(s)
- Huarong Lei
- Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, National Engineering Laboratory for VOCs Pollution Control Technology and Equipment, School of Environment and Energy, South China University of Technology, 510006 Guangzhou, China
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
| | - Dongdong Chen
- Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, National Engineering Laboratory for VOCs Pollution Control Technology and Equipment, School of Environment and Energy, South China University of Technology, 510006 Guangzhou, China
| | - Jia-Yue Yang
- Optics & Thermal Radiation Research Center, Shandong University, Qingdao 266237 China
| | - Abhishek Khetan
- Fuel Science Center, RWTH Aachen University, Schinkelstr. 8, 52074 Aachen, Germany
| | - Jiuxing Jiang
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275 China
| | - Baoxiang Peng
- Laboratory of Industrial Chemistry, Ruhr-University Bochum, Universitätsstr. 150, Bochum 44780 Germany
| | - Ulrich Simon
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
- Fuel Science Center, RWTH Aachen University, Schinkelstr. 8, 52074 Aachen, Germany
| | - Daiqi Ye
- Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, National Engineering Laboratory for VOCs Pollution Control Technology and Equipment, School of Environment and Energy, South China University of Technology, 510006 Guangzhou, China
| | - Peirong Chen
- Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, National Engineering Laboratory for VOCs Pollution Control Technology and Equipment, School of Environment and Energy, South China University of Technology, 510006 Guangzhou, China
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3
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Song K, Guo K, Mao S, Ma D, Lv Y, He C, Wang H, Cheng Y, Shi JW. Insight into the Origin of Excellent SO 2 Tolerance and de-NO x Performance of quasi-Mn-BTC in the Low-Temperature Catalytic Reduction of Nitrogen Oxide. ACS Catal 2023. [DOI: 10.1021/acscatal.3c00106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/31/2023]
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4
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Yasumura S, Kato T, Toyao T, Maeno Z, Shimizu KI. An automated reaction route mapping for the reaction of NO and active species on Ag 4 clusters in zeolites. Phys Chem Chem Phys 2023; 25:8524-8531. [PMID: 36883572 DOI: 10.1039/d2cp04761f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/09/2023]
Abstract
A computational investigation of the catalytic reaction on multinuclear sites is very challenging. Here, using an automated reaction route mapping method, the single-component artificial force induced reaction (SC-AFIR) algorithm, the catalytic reaction of NO and OH/OOH species over the Ag42+ cluster in a zeolite is investigated. The results of the reaction route mapping for H2 + O2 reveal that OH and OOH species are formed over the Ag42+ cluster via an activation barrier lower than that of OH formation from H2O dissociation. Then, reaction route mapping is performed to examine the reactivity of the OH and OOH species with NO molecules over the Ag42+ cluster, resulting in the facile reaction path of HONO formation. With the aid of the automated reaction route mapping, the promotion effect of H2 addition on the SCR reaction was computationally proposed (boosting the formation of OH and OOH species). In addition, the present study emphasizes that automated reaction route mapping is a powerful tool to elucidate the complicated reaction pathway on multi-nuclear clusters.
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Affiliation(s)
- Shunsaku Yasumura
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo, 001-0021, Japan.
| | - Taisetsu Kato
- 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.
| | - Zen Maeno
- School of Advanced Engineering, Kogakuin University, Tokyo, 192-0015, Japan
| | - Ken-Ichi Shimizu
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo, 001-0021, Japan.
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5
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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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6
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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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7
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Jia L, Liu J, Huang D, Zhao J, Zhang J, Li K, Li Z, Zhu W, Zhao Z, Liu J. Interface Engineering of a Bifunctional Cu-SSZ-13@CZO Core–Shell Catalyst for Boosting Potassium Ion and SO 2 Tolerance. ACS Catal 2022. [DOI: 10.1021/acscatal.2c03048] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Lingfeng Jia
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum (Beijing), Beijing 102249, P. R. China
| | - Jixing Liu
- School of Chemistry and Chemical Engineering, Institution for Energy Research, Jiangsu University, Zhenjiang 212013, P. R. China
- National Engineering Laboratory for Mobile Source Emission Control Technology, China Automotive Technology & Research Center Co., Ltd., Tianjin 300300, P. R. China
| | - Deqi Huang
- College of Chemical Engineering, Yangzhou Polytechnic Institute, Yangzhou 225127, P. R. China
| | - Jingchen Zhao
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum (Beijing), Beijing 102249, P. R. China
| | - Jianning Zhang
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum (Beijing), Beijing 102249, P. R. China
| | - Kaixiang Li
- National Engineering Laboratory for Mobile Source Emission Control Technology, China Automotive Technology & Research Center Co., Ltd., Tianjin 300300, P. R. China
| | - Zhenguo Li
- National Engineering Laboratory for Mobile Source Emission Control Technology, China Automotive Technology & Research Center Co., Ltd., Tianjin 300300, P. R. China
| | - Wenshuai Zhu
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum (Beijing), Beijing 102249, P. R. China
- School of Chemistry and Chemical Engineering, Institution for Energy Research, Jiangsu University, Zhenjiang 212013, P. R. China
| | - Zhen Zhao
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum (Beijing), Beijing 102249, P. R. China
| | - Jian Liu
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum (Beijing), Beijing 102249, P. R. China
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8
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NO Reduction Reaction by Kiwi Biochar-Modified MnO2 Denitrification Catalyst: Redox Cycle and Reaction Process. Catalysts 2022. [DOI: 10.3390/catal12080870] [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
NO is a major environmental pollutant. MnO2 is often used as a denitrification catalyst with poor N2 selectivity and weak SO2 resistance. Kiwi twig biochar was chosen to modify MnO2 samples by using the hydrothermal method. The NO conversion rates of the biochar-modified samples were >90% at 125–225 °C. Kiwi twig biochar made the C2MnO2 sample with a larger specific surface area, a higher number of acidic sites and Oβ/Oα molar ratio, leading to more favorable activity at high temperatures and better SO2 resistance. Moreover, the inhibition of the NH3 oxidation reaction and the Mn3+ → Mn4+ process played a crucial role in the redox cycle. What was more, Brønsted acidic sites present on the C1MnO2 sample participate in the reaction more rapidly. This study identified the role of biochar in the reaction process and provides a reference for the wide application of biochar.
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9
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Yasumura S, Qian Y, Kato T, Mine S, Toyao T, Maeno Z, Shimizu KI. In Situ/ Operando Spectroscopic Studies on the NH 3–SCR Mechanism over Fe–Zeolites. ACS Catal 2022. [DOI: 10.1021/acscatal.2c02904] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shunsaku Yasumura
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo 001-0021, Japan
| | - Yucheng Qian
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo 001-0021, Japan
| | - Taisetsu Kato
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo 001-0021, Japan
| | - Shinya Mine
- 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
| | - Zen Maeno
- School of Advanced Engineering, KKogakuin University, Tokyo 192-0015, Japan
| | - Ken-ichi Shimizu
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo 001-0021, Japan
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10
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High-Dispersed V2O5-CuOX Nanoparticles on h-BN in NH3-SCR and NH3-SCO Performance. NANOMATERIALS 2022; 12:nano12142329. [PMID: 35889554 PMCID: PMC9325198 DOI: 10.3390/nano12142329] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/30/2022] [Revised: 06/29/2022] [Accepted: 07/05/2022] [Indexed: 02/04/2023]
Abstract
Typically, to meet emission regulations, the selective catalytic reduction of NOX with NH3 (NH3-SCR) technology cause NH3 emissions owing to high NH3/NOX ratios to meet emission regulations. In this study, V-Cu/BN-Ti was used to remove residual NOX and NH3. Catalysts were evaluated for selective catalytic oxidation of NH3 (NH3-SCO) in the NH3-SCR reaction at 200–300 °C. The addition of vanadium and copper increased the number of Brønsted and Lewis acid sites available for the reaction by increasing the ratio of V5+ and forming Cu+ species, respectively. Furthermore, h-BN was dispersed in the catalyst to improve the content of vanadium and copper species on the surface. NH3 and NOX conversion were 98% and 91% at 260 °C, respectively. Consequently, slipped NH3 (NH3-Slip) emitted only 2% of the injected ammonia. Under SO2 conditions, based on the NH3 oxidation reaction, catalytic deactivation was improved by addition of h-BN. This study suggests that h-BN is a potential catalyst that can help remove residual NOX and meet NH3 emission regulations when placed at the bottom of the SCR catalyst layer in coal-fired power plants.
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11
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Wang F, Wang P, Lan T, Shen Y, Ren W, Zhang D. Ultralow-Temperature NO x Reduction over SmMn 2O 5 Mullite Catalysts Via Modulating the Superficial Dual-Functional Active Sites. ACS Catal 2022. [DOI: 10.1021/acscatal.2c01897] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Fuli Wang
- School of Environmental and Chemical Engineering, College of Sciences, Shanghai University, Shanghai 200444, China
| | - Penglu Wang
- School of Environmental and Chemical Engineering, College of Sciences, Shanghai University, Shanghai 200444, China
| | - Tianwei Lan
- School of Environmental and Chemical Engineering, College of Sciences, Shanghai University, Shanghai 200444, China
| | - Yongjie Shen
- School of Environmental and Chemical Engineering, College of Sciences, Shanghai University, Shanghai 200444, China
| | - Wei Ren
- School of Environmental and Chemical Engineering, College of Sciences, Shanghai University, Shanghai 200444, China
| | - Dengsong Zhang
- School of Environmental and Chemical Engineering, College of Sciences, Shanghai University, Shanghai 200444, China
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12
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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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13
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Achieving acetone efficient deep decomposition by strengthening reactants adsorption and activation over difunctional Au(OH)K x/hierarchical MFI catalyst. J Colloid Interface Sci 2022; 612:504-515. [PMID: 35007876 DOI: 10.1016/j.jcis.2021.12.184] [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: 11/10/2021] [Revised: 12/16/2021] [Accepted: 12/29/2021] [Indexed: 11/23/2022]
Abstract
Realizing the simultaneous adsorption and activation of O2 and reactants over supported noble metal catalysts is crucial for the oxidation of organic hydrocarbons. Herein, we report a facile one-step ethylene glycol reduction method to synthesize difunctional Au(OH)Kx sites, which were anchored on a hierarchical hollow MFI support and adopted for acetone decomposition. The alkali ion-associated adjacent surface hydroxyl groups were coordinated with Au nanoparticles, resulting in partially oxidized Au1+ sites with improved dispersion. The results obtained from exclusive ex situ and in situ experiments illustrated that the proper content of K and hydroxyl groups significantly enhanced the adsorption of surface O2 and acetone molecules around the Au sites simultaneously, whereas the excess K species inhibited the catalytic performance by blocking the pore structure and decreasing the acidity of catalysts. The Au(OH)K0.7/h-MFI catalyst exhibited the highest efficiency for acetone oxidation, over which 1500 ppm acetone can be completely oxidized at just 280 °C with an extremely low activation energy of 32.5 kJ mol-1. The carbonate species were detected as the main intermediates during acetone decomposition over the difunctional Au(OH)Kx sites through a Langmuir - Hinshelwood (L - H) mechanism. This finding paves the way for designing and constructing efficient functional active sites for the complete oxidation of hydrocarbons.
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14
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Yuan J, Mi J, Yin R, Yan T, Liu H, Chen X, Liu J, Si W, Peng Y, Chen J, Li J. Identification of Intrinsic Active Sites for the Selective Catalytic Reduction of Nitric Oxide on Metal-Free Carbon Catalysts via Selective Passivation. ACS Catal 2022. [DOI: 10.1021/acscatal.1c05947] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jin Yuan
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, P. R. China
| | - JinXing Mi
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P. R. China
| | - Rongqiang Yin
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, P. R. China
| | - Tao Yan
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, P. R. China
| | - Hao Liu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, P. R. China
| | - Xiaoping Chen
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, P. R. China
| | - Jun Liu
- College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, P. R. China
| | - Wenzhe Si
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, P. R. China
| | - Yue Peng
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, P. R. China
| | - Jianjun Chen
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, P. R. China
| | - Junhua Li
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, P. R. China
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