The catalytic activity of the Pr2Zr2−xFexO7±δ system for the CO oxidation reaction |
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Authors: | Emerson Luiz dos Santos Veiga Xavier Vendrell Villafruela Jordi Llorca Hector Beltrán-Mir Eloísa Cordoncillo |
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Affiliation: | 1. Departamento de Química Inorgánica y Orgánica, Universitat Jaume I de Castellón, Castellón de la Plana, Spain;2. Institute of Energy Technologies, Department of Chemical Engineering and Barcelona Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya, Barcelona, Spain |
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Abstract: | One of the alternatives to decrease the concentration of CO is its oxidation reaction to CO2, which can be made more efficient using catalysts. In this work, it is shown that pyrochlore structures are a promising candidate to act as heterogeneous catalysts due to their chemical and physical properties. For use as a catalyst in this reaction, the Pr2Zr2−xFexO7±δ (x = 0, 0.05, 0.10, and 0.15) system was synthesized by the solvothermal method, firing the powder obtained at temperatures of 1200 and 1400°C. The diffraction patterns confirmed the pyrochlore structure as the single phase in all the nominal compositions. The Brunauer–Emmett–Teller method and dynamic light-scattering analysis showed an increase in the particle size and a decrease in the specific surface area when increasing the iron concentration and increasing the calcination temperature. The compositions that presented the best catalytic activity were the samples with the highest iron concentration. Moreover, these samples were able to convert all the CO oxidation reactions in a narrower temperature range than a conventional CeO2 sample. The presence of vacancies and the redox behavior of the elements present are the key factors for the catalysis of this system in the CO oxidation reaction. |
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Keywords: | CO oxidation reaction heterogeneous catalysis oxidation state praseodymium and iron pyrochlore |
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