Effective CO2 activation of enriched oxygen vacancies for photothermal CO2 methanation |
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| Affiliation: | 1.Collaborative Innovation Center of Advanced Microstructures,National Laboratory of Solid State Microstructures,College of Engineering and Applied Sciences,Nanjing University,Nanjing 210093,China;Jiangsu Key Laboratory of Nano Technology,Nanjing University,Nanjing 210093,China;2.Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;3.School of Science and Engineering,The Chinese University of Hong Kong,Shenzhen 518172,China;4.Research Center for Solar Driven Carbon Neutrality,Engineering Research Center of Zero-carbon Energy Buildings and Measurement Techniques,Ministry of Education,The College of Physics Science and Technology,Institute of Life Science and Green Development,Hebei University,Baoding 071002,China |
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| Abstract: | Oxygen vacancies have been widely concerned with the facilitation effects of CO2 activation for CO2 methanation.However,little attention has been paid to the generation of active intermediate species induced by enriched oxygen vacancies.Herein,we discovered that CeNiO3-δ catalyst enriched oxygen va-cancies can efficiently activate CO2 and realize high activity for photothermal CO2 methanation.In situ dif-fuse reflectance infrared Fourier transform spectroscopy(DRIFTS)proved that oxygen vacancies are bene-ficial to the formation of reactive intermediate species of polydentate carbonate over CeNiO3-δ,which is crucial for efficient CO2 methanation.These results revealed mechanistic insights into how effective CO2 activation induced by oxygen vacancies can be manipulated by adjusting the adsorption intermediate species. |
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| Keywords: | Oxygen vacancies CO2 activation Active intermediate species Photo-thermal CO2 methanation CeNiO3 |
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