Model Systems for Heterogeneous Catalysis: Quo Vadis Surface Science?

Abstract

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CO Oxidation on a CeOx/Pt(111) Inverse Model Catalyst Surface: Catalytic Promotion and Tuning of Kinetic Phase Diagrams

“…1 Since the kinetics of surface reactions in such dispersed systems may markedly deviate from the kinetics of corresponding reactions on single crystal surfaces, model systems which mimic the properties of real catalysts are required and have been designed in many variations. [2][3][4] An important model type is composed of a single crystal metal surface covered by small oxide islands. This type of model catalysts is called "inverse model catalysts" due to a complementary character of these systems relatively to the traditional models consisting of metals dispersed on oxide supports and to the commercial oxide-supported catalysts.…”

“…A significant percentage of modern heterogeneous catalysts used in environmental or industrial applications consists of metal particles supported by oxides . Since the kinetics of surface reactions in such dispersed systems may markedly deviate from the kinetics of corresponding reactions on single crystal surfaces, model systems which mimic the properties of real catalysts are required and have been designed in many variations. − An important model type is composed of a single crystal metal surface covered by small oxide islands. This type of model catalysts is called “inverse model catalysts” due to a complementary character of these systems relatively to the traditional models consisting of metals dispersed on oxide supports and to the commercial oxide-supported catalysts. , The possibility of varying the oxide coverage from the rarefied submonolayer to dense multilayer films in a microscopically controlled way (e.g., by using the STM for characterization of the oxide formation − ) allows study of the role of the metal-oxide boundaries in such systems. , In addition, the “inverse model catalysts” are particularly suited as test systems for Monte Carlo (MC) model studies of the supported metal catalysts.…”