Sónia A C Carabineiro
University of Porto, Portugal
Title: Catalytic decomposition of N2O over Au/oxides
Biography
Biography: Sónia A C Carabineiro
Abstract
Nitrous oxide (N2O) is one of the most powerful greenhouse gases with a high global warming potential (approximately 300 times higher than CO2). N2O is responsible for the depletion of stratospheric ozone layer due to its long lifetime in atmosphere (~150 years). The present work aims to explore the effect of the support (Al2O3, CeO2, Fe2O3, TiO2 and ZnO) on the catalytic decomposition of N2O (deN2O) over Au-based catalysts prepared by a deposition-precipitation method. The following activity order was recorded: Au/Fe2O3 > Au/CeO2 > Au/ZnO > Au/TiO2 > Au/Al2O3. An inferior deN2O performance was obtained for bare supports, following, however, the same order as the gold loaded materials. A close correlation between the deN2O performance and the redox properties of oxide carriers was found, on the basis of a redox type mechanism. The addition of gold further enhanced the surface oxygen reduction, facilitating the deN2O process. Moreover, the low gold nanoparticles size (~2 nm) and the Au+ oxidation state of Au/Fe2O3 sample can be further accounted to explain the superior performance of this material.