Catalytic decomposition of N₂O over Au/oxides

5^th World Congress on Materials Science & Engineering

June 13-15, 2016 Alicante, Spain

Sonia A C Carabineiro, Michalis Konsolakis, Eleni Papista, George E Marnellos, Pedro B Tavares and Francisco J Maldonado-Hodar

University of Porto, Portugal
University of Western Macedonia, Greece
Centre for Research & Technology Hellas, Greece
University of Tr�¡s-os-Montes e Alto Douro, Portugal
University of Granada, Spain
Technical University o

Scientific Tracks Abstracts: J Material Sci Eng

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.

Biography :

Sónia A C Carabineiro has completed her PhD in 2001 at the Universidade Nova de Lisboa (Portugal) and Post-doctoral studies from Leiden University (The Netherlands) and Instituto Superior Técnico (Portugal). In December 2007, she joined the University of Oporto (Portugal) as an Assistant Researcher and became Principal Researcher by December 2013. She has published more than 90 papers in reputed journals and 19 book chapters. She has an h index of 24 and over 1400 citations (Scopus, May 2016). She is particularly interested in catalysis by gold, (mixed) metal oxides, carbon materials and in heterogenisation of homogenous materials for oxidation reactions.

Email: scarabin@fe.up.pt