CO2 reduction over NaNbO3 and NaTaO3 perovskite photocatalysts. Issue 1 (5th September 2016)

• Record Type: Journal Article
• Authors: Fresno, F.; Jana, P.; Reñones, P.; Coronado, J. M.; Serrano, D. P.; de la Peña O'Shea, V. A.
• Is Part Of: Photochemical & photobiological sciences. Volume 16:Issue 1(2017)
• Page Start: 17
• Page End: 23
• Publication Date: 2016-09-05
• Subjects: Photochemistry -- Periodicals; Photobiology -- Periodicals; 541.35
• DOI: 10.1039/c6pp00235h
• Languages: English
• ISSNs: 1474-905X

Abstract

Abstract : Both NaNbO3 and NaTaO3 exhibit interesting intrinsic photocatalytic activities for CO2 reduction in terms of conversion and selectivity. Abstract : 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 .