Abstract
Ceria-zirconia mixed oxides and gold supported oxides exhibit very good thermal stability and catalytic activity, as well as great selectivity. This work has been focused on the controlled synthesis and characterization of cationic- and amphiphilic-templated ceria, zirconia, and ceria-zirconia mixed oxides from nitrate and iso-propoxide precursors, and ceria-zirconia mixed oxides modified with gold via the deposition precipitation method with urea. The characterization of the acidic and basic properties was carried out through two test reactions. A complete chemical and structural characterization of the materials was done using Atomic Absorption Spectroscopy (AAS), Brunauer-Emmet-Teller Surface Analysis (N2-BET), X-Ray Diffraction (XRD), NH3- Temperature Programmed Desorption (TPD)/CO2-TPD, and Fourier Transform Infrared Spectroscopy (FTIR). Template techniques led to the formation of high surface area mesoporous materials with high activity and thermal stability. In general, the acid sites density was decreased, whereas the basic site density was increased by modification with Au or incorporation of zirconia in case of mixed oxides.
Highlights
Ceria (CeO2 ) based materials have been widely investigated, and are attracting a considerable interest, due to their application in several fields such as catalysis, electrochemistry, photochemistry, and materials science
Ceria is a component of three-way catalysts (TWC) [1], andis used as a base material for electrolytes and electrodes in solid oxide fuel cells (SOFCs) [2]
The properties and catalytic activities of all prepared catalysts were compared with a reference sample prepared from commercial ceria
Summary
Ceria (CeO2 ) based materials have been widely investigated, and are attracting a considerable interest, due to their application in several fields such as catalysis, electrochemistry, photochemistry, and materials science. Ceria is a component of three-way catalysts (TWC) [1], andis used as a base material for electrolytes and electrodes in solid oxide fuel cells (SOFCs) [2]. It is widely used as support material in transition metal or noble metal catalysis, due to its outstanding properties [3,4,5,6,7]. Based on the previously mentioned properties, zirconia is used for extrusion dies, machinery wear parts, and piston caps It is utilized in electrochemical cells, fuel cells, and oxygen sensors, due to its high oxygen-ion conductivity. Its low thermal conductivity encourages its use as a thermal barrier coating for aerospace engine components
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