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Cui W, Xia Y, Zhang P, Fu Y, Ye X, Li J, Tan L. The pivotal role of bromine in FeMnKBr/Y Na catalyst for CO 2 hydrogenation to light olefins. iScience 2024; 27:109621. [PMID: 38638568 PMCID: PMC11024928 DOI: 10.1016/j.isci.2024.109621] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2023] [Revised: 02/09/2024] [Accepted: 03/26/2024] [Indexed: 04/20/2024] Open
Abstract
Light olefins are key intermediates in the synthesis of petrochemicals, and the conversion of stabilized carbon dioxide to light olefins using catalysts containing halogenated elements such as chlorine is a major challenge. Building on previous reports emphasizing the toxic effects of halogen elements on catalysts, we present the synthesis of FeMnKBr/YNa catalysts. This involved the synthesis of the catalyst by melt permeation using Br-containing potassium salts, other metal nitrates and YNa zeolites. The catalyst performed well in converting syngas (H2/CO2 = 3) to light olefins with a selectivity of 56.2%, CO2 conversion of 34.4%, and CO selectivity of 13.6%. Adding Br aids in reducing the Fe phase, boosts catalyst carburization, and produces more iron carbide species. It also moderately deposits carbon on the active center's surface, enhancing active phase dispersion. Br's electronegativity mitigates the influence of K, reducing catalyst's carbon-carbon coupling ability, leading to more low-carbon olefins generation.
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Affiliation(s)
- Wenjie Cui
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China
| | - Yudong Xia
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China
| | - Peipei Zhang
- CNOOC Institute of Chemicals & Advanced Materials, Beijing 102209, China
| | - Yajie Fu
- Fujian Key Laboratory of Electrochemical Energy Storage Materials, State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350108, China
| | - Xue Ye
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China
| | - Jie Li
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China
| | - Li Tan
- Fujian Key Laboratory of Electrochemical Energy Storage Materials, State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350108, China
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Cai Z, Zhang F, Cao X, Huang Y, Wang D, Zhang L, Huang K. The Effect of Mn, Al Doping on the CO 2 Hydrogenation Performance of CaCO 3 -Supported Fe-Based Catalysts. Chempluschem 2023; 88:e202300286. [PMID: 37551722 DOI: 10.1002/cplu.202300286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Revised: 07/23/2023] [Accepted: 08/07/2023] [Indexed: 08/09/2023]
Abstract
With increasingly serious environmental problems caused by the greenhouse effect, it has also become essential to reduce the concentration of CO2 in the atmosphere. In this paper, CaCO3 -supported Fe-based catalysts doped with Mn, Al, and K are prepared by a straightforward method and used for CO2 hydrogenation. The fresh and spent catalysts were characterized by SEM-EDS, BET, TG, CO2 -TPD, XRD, and XPS. The experimental results show that the highest CO2 conversion rate of Fe10Mn2Al10Ca is 35.99 %, the maximum FTY value is 293.98 μmolCO2 ⋅ g Fe - 1 ${{\rm{g}}_{{\rm{Fe}}}^{ - 1} }$ ⋅ s-1 , the maximum O/P value is 6.61, and the lowest CO selectivity is 32.21 %. At the same time, according to the characterization results, the doping of Mn and Al increased the Fe3 O4 /FeCx ratio. As the Fe3 O4 /FeCx ratio increases, the proportion of short-chain hydrocarbons (CH4 , C2-4 ) in the products increases, and the proportion of long-chain hydrocarbons (C5+ ) decrease. Therefore, the co-doping of Mn and Al promotes the conversion of CO and reduces its selectivity, and promotes the formation of light olefins. Finally, it is hoped that this study can provide a reference for further research on CaCO3 -supported Fe catalysts.
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Affiliation(s)
- Zhenyu Cai
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, P. R. China
| | - Fenglei Zhang
- Intelligent Transportation System Research Center, Southeast University, Nanjing, 211189, P. R. China
| | - Xinjie Cao
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, P. R. China
| | - Yifei Huang
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, P. R. China
| | - Danlei Wang
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, P. R. China
| | - Lei Zhang
- Intelligent Transportation System Research Center, Southeast University, Nanjing, 211189, P. R. China
| | - Kai Huang
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing, 211189, P. R. China
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Wang H, Nie X, Liu Y, Janik MJ, Han X, Deng Y, Hu W, Song C, Guo X. Mechanistic Insight into Hydrocarbon Synthesis via CO 2 Hydrogenation on χ-Fe 5C 2 Catalysts. ACS APPLIED MATERIALS & INTERFACES 2022; 14:37637-37651. [PMID: 35969512 DOI: 10.1021/acsami.2c07029] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Converting CO2 into value-added chemicals and fuels is one of the promising approaches to alleviate CO2 emissions, reduce the dependence on nonrenewable energy resources, and minimize the negative environmental effect of fossil fuels. This work used density functional theory (DFT) calculations combined with microkinetic modeling to provide fundamental insight into the mechanisms of CO2 hydrogenation to hydrocarbons over the iron carbide catalyst, with a focus on understanding the energetically favorable pathways and kinetic controlling factors for selective hydrocarbon production. The crystal orbital Hamiltonian population analysis demonstrated that the transition states associated with O-H bond formation steps within the path are less stable than those of C-H bond formation, accounting for the observed higher barriers in O-H bond formation from DFT. Energetically favorable pathways for CO2 hydrogenation to CH4 and C2H4 products were identified which go through an HCOO intermediate, while the CH* species was found to be the key C1 intermediate over χ-Fe5C2(510). The microkinetic modeling results showed that the relative selectivity to CH4 is higher than C2H4 in CO2 hydrogenation, but the trend is opposite under CO hydrogenation conditions. The major impact on C2 hydrocarbon production is attributed to the high surface coverage of O* from CO2 conversion, which occupies crucial active sites and impedes C-C couplings to C2 species over χ-Fe5C2(510). The coexistence of iron oxide and carbide phases was proposed and the interfacial sites created between the two phases impact CO2 surface chemistry. Adding potassium into the Fe5C2 catalyst accelerates O* removal from the carbide surface, enhances the stability of the iron carbide catalyst, thus, promotes C-C couplings to hydrocarbons.
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Affiliation(s)
- Haozhi Wang
- State Key Laboratory of Fine Chemicals, PSU-DUT Joint Center for Energy Research, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China
- Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Binhai New City, Fuzhou 350207, China
- School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education), Tianjin University, Tianjin 300072, China
| | - Xiaowa Nie
- State Key Laboratory of Fine Chemicals, PSU-DUT Joint Center for Energy Research, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China
| | - Yuan Liu
- School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education), Tianjin University, Tianjin 300072, China
| | - Michael J Janik
- EMS Energy Institute, PSU-DUT Joint Center for Energy Research, and Department of Energy & Mineral Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Xiaopeng Han
- School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education), Tianjin University, Tianjin 300072, China
| | - Yida Deng
- School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education), Tianjin University, Tianjin 300072, China
| | - Wenbin Hu
- Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Binhai New City, Fuzhou 350207, China
- School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education), Tianjin University, Tianjin 300072, China
| | - Chunshan Song
- State Key Laboratory of Fine Chemicals, PSU-DUT Joint Center for Energy Research, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China
- Department of Chemistry, Faculty of Science, The Chinese University of Hong Kong, Shatin, NT 999077, Hong Kong, China
| | - Xinwen Guo
- State Key Laboratory of Fine Chemicals, PSU-DUT Joint Center for Energy Research, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China
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