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Pan W, He S, Xue Q, Liu X, Fu J, Xiao K, Zhang A. First-principles study on the heterogeneous formation of environmentally persistent free radicals (EPFRs) over α-Fe 2O 3(0001) surface: Effect of oxygen vacancy. J Environ Sci (China) 2024; 142:279-289. [PMID: 38527893 DOI: 10.1016/j.jes.2023.07.021] [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: 05/19/2023] [Revised: 07/13/2023] [Accepted: 07/19/2023] [Indexed: 03/27/2024]
Abstract
Metal oxides with oxygen vacancies have a significant impact on catalytic activity for the transformation of organic pollutants in waste-to-energy (WtE) incineration processes. This study aims to investigate the influence of hematite surface oxygen point defects on the formation of environmentally persistent free radicals (EPFRs) from phenolic compounds based on the first-principles calculations. Two oxygen-deficient conditions were considered: oxygen vacancies at the top surface and on the subsurface. Our simulations indicate that the adsorption strength of phenol on the α-Fe2O3(0001) surface is enhanced by the presence of oxygen vacancies. However, the presence of oxygen vacancies has a negative impact on the dissociation of the phenol molecule, particularly for the surface with a defective point at the top layer. Thermo-kinetic parameters were established over a temperature range of 300-1000 K, and lower reaction rate constants were observed for the scission of phenolic O-H bonds over the oxygen-deficient surfaces compared to the pristine surface. The negative effects caused by the oxygen-deficient conditions could be attributed to the local reduction of FeIII to FeII, which lower the oxidizing ability of surface reaction sites. The findings of this study provide us a promising approach to regulate the formation of EPFRs.
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Affiliation(s)
- Wenxiao Pan
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Shuming He
- School of Environment, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310012, China
| | - Qiao Xue
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
| | - Xian Liu
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Jianjie Fu
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; School of Environment, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310012, China
| | - Kang Xiao
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China; Beijing Yanshan Earth Critical Zone National Research Station, University of Chinese Academy of Sciences, Beijing 101408, China
| | - Aiqian Zhang
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; School of Environment, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310012, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China.
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Pomalaza G, Arango Ponton P, Capron M, Dumeignil F. Ethanol-to-butadiene: the reaction and its catalysts. Catal Sci Technol 2020. [DOI: 10.1039/d0cy00784f] [Citation(s) in RCA: 55] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Catalytic conversion of ethanol is a promising technology for producing sustainable butadiene. This paper reviews the reaction and its catalysts, and discusses the challenges their development faces.
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Wu X, Fang Z, Pan H, Zheng Y, Jiang D, Ni J, Li X. Active oxygen species on Mg–La mixed oxides: the effect of Mg and La oxide interactions. Catal Sci Technol 2017. [DOI: 10.1039/c6cy02286c] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Mg–La mixed oxide catalysts with a strong interaction between Mg and La oxides had higher amounts of oxygen vacancies and surface adsorbed oxygen species, resulting in a better performance in H2 oxidation and CH4 oxidative reactions.
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Affiliation(s)
- Xianyuan Wu
- Institute of Industrial Catalysis
- Zhejiang University of Technology
- Hangzhou
- China
| | - Zheng Fang
- Institute of Industrial Catalysis
- Zhejiang University of Technology
- Hangzhou
- China
| | - Hui Pan
- Institute of Applied Physics and Materials Engineering
- University of Macau
- China
| | - Yifan Zheng
- Institute of Industrial Catalysis
- Zhejiang University of Technology
- Hangzhou
- China
| | - Dahao Jiang
- Institute of Industrial Catalysis
- Zhejiang University of Technology
- Hangzhou
- China
| | - Jun Ni
- Institute of Industrial Catalysis
- Zhejiang University of Technology
- Hangzhou
- China
| | - Xiaonian Li
- Institute of Industrial Catalysis
- Zhejiang University of Technology
- Hangzhou
- China
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Zavyalova U, Geske M, Horn R, Weinberg G, Frandsen W, Schuster M, Schlögl R. Morphology and Microstructure of Li/MgO Catalysts for the Oxidative Coupling of Methane. ChemCatChem 2010. [DOI: 10.1002/cctc.201000098] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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