Cu-Al-O x mixed metal oxides with intended molar ratios of Cu/Al = 85/15, 78/22, 75/25, 60/30, were prepared by thermal decomposition of precursors at 600 °C and tested for the decomposition of nitrous oxide (deN2O). Techniques such as XRD, ICP-MS, N2 physisorption, O2-TPD, H2-TPR, in situ FT-IR and XAFS were used to characterize the obtained materials. Physico-chemical characterization revealed the formation of mixed metal oxides characterized by different specific surface area and thus, different surface oxygen default sites. The O2-TPD results gained for Cu-Al-O x mixed metal oxides conform closely to the catalytic reaction data. In situ FT-IR studies allowed detecting the form of Cu+⋯N2 complexes due to the adsorption of nitrogen, i.e. the product in the reaction between N2O and copper lattice oxygen. On the other hand, mostly nitrate species and NO were detected but those species were attributed to the residue from catalyst synthesis.

Center for Automotive Catalytic Systems Aachen ACA RWTH Aachen University Schinkelstr 8 52062 Aachen Germany

Chair of Heterogeneous Catalysis and Chemical Technology RWTH Aachen University Worringerweg 2 52074 Aachen Germany 49 241 80 22177 49 241 80 26497

Department of Chemistry University College London 20 Gordon Street London WC1H 0AJ UK

Faculty of Chemistry Jagiellonian University in Kraków Gronostajowa 2 30 387 Kraków Poland

Institut Charles Gerhardt de Montpellier 240 Avenue du Professeur Emile Jeanbrau 34296 Montpellier Cedex 5 France

UK Catalysis Hub Research Complex at Harwell Rutherford Appleton Laboratories Didcot Oxon OX11 0FA UK

VŠB Technical University of Ostrava 17 listopadu 15 708 33 Ostrava Czech Republic

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