Elektronová struktura a stabilita rutheniových oxidů na redukovatelných oxidech kovů

Dinhová, Thu Ngan

Title: Electronic Structure and Stability of Ru Species on Reducible Metal Oxide Supports Author: Thu Ngan Dinhová Department: Department of Surface and Plasma Science Supervisor: doc. Mgr. Michael Vorochta, Ph.D. Abstract: In heterogeneous catalysis, understanding the nature and stability of active sites is essential for the rational design of efficient, robust systems. Supported catalysts are widely employed, as the choice of support can significantly enhance stability, activity, and the efficient utilization of expensive active metals. This work investigates ruthenium (Ru) supported on cerium and cobalt oxides as oxidation catalysts, focusing on metal-oxide interactions, stability under UHV and oxidizing conditions, and the influence of common catalyst pretreatment procedures. By combining well-defined model systems with synthesized powders, we identify distinct surface processes on ceria- and cobalt oxide-supported systems, while addressing the additional complexities of powder catalysts and their pretreatment. The behavior of Ru on cerium oxide is highly sensitive to the reduction state of the oxide support. Thermally stable Ru species are anchored at surface defects, such as step edges and oxygen vacancies, forming atomically dispersed species and small nanoparticles. Under oxidizing conditions, Ru...

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