The ZnxZr1−xO2−y solid solution on m-ZrO2: Creating O vacancies and improving the m-ZrO2 redox properties
| Autor: | Roberto R. de Avillez, Odivaldo C. Alves, Leydi del R. Silva-Calpa, Priscila C. Zonetti, Lucia G. Appel, Clarissa Perdomo Rodrigues |
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| Rok vydání: | 2016 |
| Předmět: |
Process Chemistry and Technology
Inorganic chemistry Oxide chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Oxygen Redox Catalysis 0104 chemical sciences law.invention symbols.namesake chemistry.chemical_compound X-ray photoelectron spectroscopy chemistry law symbols Physical and Theoretical Chemistry 0210 nano-technology Raman spectroscopy Electron paramagnetic resonance Solid solution |
| Zdroj: | Journal of Molecular Catalysis A: Chemical. 425:166-173 |
| ISSN: | 1381-1169 |
| DOI: | 10.1016/j.molcata.2016.10.008 |
| Popis: | In order to improve the redox properties of m-ZrO2, three different amounts of Zn were added to this oxide using a simple and effective technique. The XRD, XPS and Raman techniques showed that Zn did not form a ZnO phase but instead it diffused inside the first layers of m-ZrO2 lattice. The XRD, EPR and also TPD of H2O results indicated the formation of oxygen vacancies when Zn was added to m-ZrO2. These results showed that Zn replaces Zr in the m-ZrO2 lattice forming a surface solid solution (ZnxZr1−xO2−y). The TPR-H2 experiments exhibited that as the Zn concentration increased, the H2 consumption raised as well. The TPD of ethanol depicted that Zn catalysts were able to oxidize ethanol whereas m-ZrO2 was not. These results are associated with the higher oxygen mobility and reducibility of these samples compared with m-ZrO2. Finally, it was verified that increasing the Zn concentration in the catalysts, increases the CO2 conversion rate in the RWGS reaction, as well. Thus, the formation of the ZnxZr1−xO2−y surface solid solution generates O vacancies and improves the reducibility and O mobility of m-ZrO2. Adding Zn to m-ZrO2 changes the redox properties of the oxide |
| Databáze: | OpenAIRE |
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