Understanding the formation of active site in copper ceria system for carbon dioxide catalytic conversion
<p dir="ltr">Copper-based catalysts, particularly those supported by ceria (CeO<sub>2</sub>), provide a cost-effective substitute for noble metals in hydrogenation reactions. The interaction between Cu and CeO<sub>2</sub> improves dispersion and generates esse...
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2025
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| Summary: | <p dir="ltr">Copper-based catalysts, particularly those supported by ceria (CeO<sub>2</sub>), provide a cost-effective substitute for noble metals in hydrogenation reactions. The interaction between Cu and CeO<sub>2</sub> improves dispersion and generates essential active sites, such as Cu+ and oxygen vacancies, vital for catalytic efficiency. This study explores the creation of active sites in Cu/CeO<sub>2</sub> catalysts through adjustments in metal content and calcination conditions. The findings reveal that the 2 wt%Cu/CeO<sub>2</sub> catalyst calcined at 600 °C achieved the highest CO<sub>2</sub> conversion via reverse water gas shift reaction (RWGS) to CO, approximately 60 % at 600 °C, with minimal coke formation. Additionally, the catalyst also exhibited reactivity in the dry reforming of methane at elevated temperatures (above 800 °C). The characterization data suggest that the strong interaction among finely dispersed CuO and the CeO<sub>2</sub> support enhances electron transfer, leading to a higher density of surface oxygen vacancies and Cu+ species, which in turn promotes the redox cycle. The density of Cu+/(Cu++Cu<sup>2</sup>+) and surface oxygen vacancy correlates very well with the synthesis conditions and catalytic activity towards CO<sub>2</sub> conversion. The results suggest that Cu loading and calcination temperature in Cu/CeO<sub>2</sub> system could significantly enhance the presence of active sites for effective CO<sub>2</sub> hydrogenation.</p><h2>Other Information</h2><p dir="ltr">Published in: Gas Science and Engineering<br>License: <a href="http://creativecommons.org/licenses/by/4.0/" target="_blank">http://creativecommons.org/licenses/by/4.0/</a><br>See article on publisher's website: <a href="https://dx.doi.org/10.1016/j.jgsce.2025.205764" target="_blank">https://dx.doi.org/10.1016/j.jgsce.2025.205764</a></p> |
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