Combined Macroscopic, Nanoscopic, and Atomic‐Scale Characterization of Gold–Ruthenium Bimetallic Catalysts for Octanol Oxidation. (23rd May 2016) - Chinchilla, Lidia E.
Abstract : A series of gold–ruthenium bimetallic catalysts of increasing Au:Ru molar ratios supported on a Ce0.62 Zr0.38 O2 mixed oxide are prepared and their structural and chemical features characterized by a combination of macroscopic and atomic‐scale techniques based on scanning transmission electron microscopy. The influence of the temperature of the final reduction treatment used as activation step (350–700 °C range) is also investigated. The preparation method used allows catalysts to be successfully prepared where a major fraction of the metal nanoparticles is in the size range below 5 nm. The structural complexities characteristic of this type of catalysts are evidenced, as well as the capabilities and limitations of both the macroscopic and microscopic techniques in the characterization of the system of metal nanoparticles. A positive influence of the addition of Ru on both the resistance against sintering and the catalytic performance of the starting supported Au catalyst is evidenced. Abstract : A series of supported gold–ruthenium bimetallic catalysts of varying Au:Ru molar ratios are prepared onto ceria–zirconium mixed oxide (Ce0.62 Zr0.38 O2 ). A combination of macroscopic and nanometric‐scale techniques based on scanning transmission electron microscopy are used to characterize their structural and chemical features and the resistance against sintering. Catalytic behavior is tested in the selective oxidation of octanol.