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Chen X, Luo D, Hu R, Cui Y, Wang Z, Dai B, Xu C. A method to synthesize specific active Cu sites of single-atom catalysts with high stability for acetylene hydration. J Colloid Interface Sci 2024; 665:526-534. [PMID: 38547634 DOI: 10.1016/j.jcis.2024.03.106] [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: 01/01/2024] [Revised: 03/15/2024] [Accepted: 03/15/2024] [Indexed: 04/17/2024]
Abstract
Single-atom catalysts (SACs) have received much attention in the realm of energy and catalytic conversion due to their maximum atomic efficiency. Herein, we report a cascade anchoring strategy for the preparation of a Cu-S1O2 species of single-atom catalyst attached to a carbon carrier containing P and S (Cu-S1O2 SA/CPS) with a content of 12.4 wt%. Over the Cu-S1O2 SA/CPS catalyst, the conversion of 95.8% and selectivity of 87.2% for acetylene hydration could still be achieved at 70 h (T = 200°C, GHSV(C2H2) = 90 h-1 and VH2O/VC2H2 = 4). X-ray absorption spectroscopy (XAS) and X-ray photoelectron spectroscopy (XPS) tests reveal that the Cu atoms of Cu-S1O2 SA/CPS are predominantly coordinated in a trinary manner (Cu-S1O2). Based on high-resolution aberration-corrected high-angle annular dark-field scanning transmission electron microscope (HAADF-STEM), it is demonstrated that the Cu single-atom sites are highly dispersed in Cu-S1O2 SA/CPS. It is evident from the scanning electron microscopy (SEM) that Cu-S1O2 SA/CPS has a two-dimensional layered structure. The specific structure of the active site Cu is primarily attributed to the coordination of S and O atoms, resulting in its superior stability for acetylene hydration towards the synthesis of acetaldehyde. Density functional theory (DFT) calculations confirm that the formation of the Cu-S1O2 site facilitates the activation of acetylene, which is a pivotal step in the acetylene hydration process and considered as the rate-determining step. This article not only introduces an innovative strategy in the synthesis of Cu SACs but also represents a significant breakthrough in the stability of Cu SACs in acetylene hydration.
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Affiliation(s)
- Xiejie Chen
- School of Chemistry and Chemical Engineering, Shihezi University/State Key Laboratory Incubation Base for Green Processing of Chemical Engineering, Shihezi 832003, PR China
| | - Dingjie Luo
- School of Chemistry and Chemical Engineering, Shihezi University/State Key Laboratory Incubation Base for Green Processing of Chemical Engineering, Shihezi 832003, PR China
| | - Rui Hu
- School of Chemistry and Chemical Engineering, Shihezi University/State Key Laboratory Incubation Base for Green Processing of Chemical Engineering, Shihezi 832003, PR China
| | - Yi Cui
- School of Chemistry and Chemical Engineering, Shihezi University/State Key Laboratory Incubation Base for Green Processing of Chemical Engineering, Shihezi 832003, PR China
| | - Zongyuan Wang
- School of Chemistry and Chemical Engineering, Shihezi University/State Key Laboratory Incubation Base for Green Processing of Chemical Engineering, Shihezi 832003, PR China.
| | - Bin Dai
- School of Chemistry and Chemical Engineering, Shihezi University/State Key Laboratory Incubation Base for Green Processing of Chemical Engineering, Shihezi 832003, PR China.
| | - Caixia Xu
- School of Chemistry and Chemical Engineering, Shihezi University/State Key Laboratory Incubation Base for Green Processing of Chemical Engineering, Shihezi 832003, PR China.
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Zhang Y, Li S, Qiao X, Guan Q, Li W. Efficient and stable N-heterocyclic ketone-Cu complex catalysts for acetylene hydrochlorination: the promotion effect of ligands revealed from DFT calculations. Phys Chem Chem Phys 2023; 25:25581-25593. [PMID: 37721015 DOI: 10.1039/d3cp02514d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/19/2023]
Abstract
Cu-based catalysts are a promising alternative to toxic mercury catalysts for acetylene hydrochlorination, but their effectiveness is limited due to the poor dispersion and deactivation caused by reduction, agglomeration, and carbon deposition. In this study, the activity and stability of carbon-supported CuCl2 catalysts were largely improved by introducing N-heterocyclic ketones. Remarkably, N-methyl-2-pyridone (NM2P) coordinated Cu-based catalysts exhibited over 95% acetylene conversion with better stability under the reaction conditions of T = 180 °C, GHSV (C2H2) of 80 h-1, and VHCl/VC2H2 = 1.2. The combined results of characterization and exhaustive density functional theory (DFT) calculations revealed that the O-Cu coordination between the NM2P ligand and Cu cation strengthened the combination of reactants and Cu active sites, lowering the key reaction energy barrier, thereby leading to high activity. Meanwhile, the addition of the NM2P ligand significantly inhibited the reduction of Cu2+ to Cu+/Cu0, avoiding the formation of CuCl aggregates and the coking caused by Cu0, enhancing the catalytic stability. Overall, our study provides important insights into the design and optimization of Cu-based catalysts for acetylene hydrochlorination.
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Affiliation(s)
- Yilin Zhang
- College of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, No. 94 Weijin Road, Tianjin 300071, P. R. China.
| | - Sen Li
- College of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, No. 94 Weijin Road, Tianjin 300071, P. R. China.
| | - Xianliang Qiao
- College of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, No. 94 Weijin Road, Tianjin 300071, P. R. China.
| | - Qingxin Guan
- College of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, No. 94 Weijin Road, Tianjin 300071, P. R. China.
| | - Wei Li
- College of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, No. 94 Weijin Road, Tianjin 300071, P. R. China.
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Li F, Wang X, Zhang P, Wang Q, Zhu M, Dai B. Nitrogen and phosphorus co-doped activated carbon induces high density Cu+ active center for acetylene hydrochlorination. Chin J Chem Eng 2023. [DOI: 10.1016/j.cjche.2023.01.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
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The Pincer Ligand Supported Ruthenium Catalysts for Acetylene Hydrochlorination: Molecular Mechanisms from Theoretical Insights. Catalysts 2022. [DOI: 10.3390/catal13010031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Pincer ligand supported RuII chloride complexes may be used for acetylene hydrochlorination as non-mercury molecular catalysts. Based on theoretical calculations, the catalytic mechanism and the interaction between catalysts and reactants has been evaluated, indicating that the (pincer)RuIICl2 platform supports electrophilic proton-ruthenation of C2H2. Energy decomposition studies further illustrate the electron-rich property of the RuII center, which can increase the negative charge of C2H2 via 4d-electron backdonation. Thus, the electrophilic reaction mechanism is favored due to lower energetic barriers. By improving the electron-donating ability of ligands, this lowering of energetic barriers can be enhanced. Therefore, non-mercury catalysts for acetylene hydrochlorination with milder reaction conditions and higher catalytic activity can be designed.
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Abstract
The advent of fuel cells has led to a series of studies on hydrogen production. As an excellent hydrogen carrier, methanol can be used for reforming to produce hydrogen. Copper-based catalysts have been widely used in methanol reforming due to their high catalytic activity and low-cost preparation. However, copper-based catalysts have been subjected to poor stability due to spontaneous combustion, sintering, and deactivation. Thus, the research on the optimization of copper-based catalysts is of great significance. This review analyzes several major factors that affect the stability of copper-based catalysts, and then comments on the progress made in recent years to improve the catalytic stability through various methods, such as developing preparation methods, adding promoters, and optimizing supports. A large number of studies have shown that sintering and carbon deposition are the main reasons for the deactivation of copper-based catalysts. It was found that the catalysts prepared by the modified impregnation method exhibit higher catalytic activity and stability. For the promoters and supports, it was also found that the doping of metal oxides such as MgO and bimetallic oxides such as CeO2-ZrO2 as the support could present better catalytic performance for the methanol reforming reaction. It is of great significance to discover some new materials, such as copper-based spinel oxide, with a sustained-release catalytic mechanism for enhancing the stability of Cu-based catalysts. However, the interaction mechanism between the metal and the support is not fully understood, and the research of some new material copper-based catalysts in methanol reforming has not been fully studied. These are the problems to be solved in the future.
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Construction of multistage porous carbon materials for the hydrochlorination of acetylene: Impact of nitrogen incorporation. MOLECULAR CATALYSIS 2022. [DOI: 10.1016/j.mcat.2022.112405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Liu L, Song L, Xu D, Zhu M, Dai B. Effect of the Transforming Ag into an Active Species (Silver Chloride) for the Acetylene Hydrochlorination. ChemCatChem 2021. [DOI: 10.1002/cctc.202101022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Li Liu
- School of Chemistry and Chemical Engineering Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan Shihezi University 221 Beisi Way Shihezi Xinjiang 832000 P. R. China
| | - Lutai Song
- School of Chemistry and Chemical Engineering Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan Shihezi University 221 Beisi Way Shihezi Xinjiang 832000 P. R. China
| | - Dong Xu
- School of Chemistry and Chemical Engineering Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan Shihezi University 221 Beisi Way Shihezi Xinjiang 832000 P. R. China
| | - Mingyuan Zhu
- School of Chemistry and Chemical Engineering Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan Shihezi University 221 Beisi Way Shihezi Xinjiang 832000 P. R. China
- College of Chemistry & Chemical Engineering Yantai University 32 Qingquan Way Yantai Shandong 264010 P. R. China
| | - Bin Dai
- School of Chemistry and Chemical Engineering Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan Shihezi University 221 Beisi Way Shihezi Xinjiang 832000 P. R. China
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Wang B, Jiang Z, Wang T, Tang Q, Yu M, Feng T, Tian M, Chang R, Yue Y, Pan Z, Zhao J, Li X. Controllable Synthesis of Vacancy-Defect Cu Site and Its Catalysis for the Manufacture of Vinyl Chloride Monomer. ACS Catal 2021. [DOI: 10.1021/acscatal.1c01921] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Bolin Wang
- Institute of Industrial Catalysis, Zhejiang University of Technology, Hangzhou 310014, China
- Department of Environmental Engineering, Zhejiang University of Technology, Hangzhou 310014, China
| | - Zhao Jiang
- Institute of Industrial Catalysis, Zhejiang University of Technology, Hangzhou 310014, China
| | - Ting Wang
- Institute of Industrial Catalysis, Zhejiang University of Technology, Hangzhou 310014, China
| | - Qi Tang
- Institute of Industrial Catalysis, Zhejiang University of Technology, Hangzhou 310014, China
| | - Mingde Yu
- Institute of Industrial Catalysis, Zhejiang University of Technology, Hangzhou 310014, China
| | - Tao Feng
- Institute of Industrial Catalysis, Zhejiang University of Technology, Hangzhou 310014, China
| | - Min Tian
- Institute of Industrial Catalysis, Zhejiang University of Technology, Hangzhou 310014, China
| | - Renqin Chang
- Research Center of Analysis Measurement, Zhejiang University of Technology, Hangzhou 310014, China
| | - Yuxue Yue
- Institute of Industrial Catalysis, Zhejiang University of Technology, Hangzhou 310014, China
| | - Zhiyan Pan
- Department of Environmental Engineering, Zhejiang University of Technology, Hangzhou 310014, China
| | - Jia Zhao
- Institute of Industrial Catalysis, Zhejiang University of Technology, Hangzhou 310014, China
| | - Xiaonian Li
- Institute of Industrial Catalysis, Zhejiang University of Technology, Hangzhou 310014, China
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