| Autor: |
Fresno, F., Jana, P., Reñones, P., Coronado, J. M., Serrano, D. P., de la Peña O'Shea, V. A. |
| Předmět: |
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| Zdroj: |
Photochemical & Photobiological Sciences; Jan2017, Vol. 16 Issue 1, p17-23, 7p |
| Abstrakt: |
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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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