CO2 reduction over NaNbO3 and NaTaO3 perovskite photocatalysts
| Autor: | Juan M. Coronado, Fernando Fresno, Prabhas Jana, Patricia Reñones, David P. Serrano, V.A. de la Peña O'Shea |
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| Rok vydání: | 2017 |
| Předmět: |
Photoluminescence
Materials science Inorganic chemistry 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences 0104 chemical sciences Tantalate symbols.namesake Adsorption symbols Photocatalysis Orthorhombic crystal system Physical and Theoretical Chemistry 0210 nano-technology Raman spectroscopy Monoclinic crystal system Perovskite (structure) |
| Zdroj: | Photochemical & Photobiological Sciences. 16:17-23 |
| ISSN: | 1474-9092 1474-905X |
| DOI: | 10.1039/c6pp00235h |
| Popis: | The activity of NaNbO3 and NaTaO3 perovskites for the photocatalytic reduction of CO2 is studied in this work. For this purpose, sodium niobate and tantalate have been prepared using solid-state reactions, extensively characterised by means of powder X-ray diffraction, UV-vis, photoluminescence and Raman spectroscopies and N2 adsorption isotherms, and tested in the gas-phase reduction of CO2 under UV light in a continuous flow photoreactor. NaNbO3 is constituted of an orthorhombically distorted perovskite structure, while a ca. 4.5:1 combination of the orthorhombic and monoclinic modifications is found in the tantalate. Both catalysts exhibit interesting intrinsic activities, with the tantalate material giving rise to a slightly higher performance. This is attributed to a compromise situation between electron–hole recombination and the reducing potential of conduction band electrons. In addition, a decrease in the competition of water protons for photogenerated electrons is observed with both catalysts with respect to TiO2. |
| Databáze: | OpenAIRE |
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