From single crystals to supported nanoparticles in oscillatory behavior of CO+O2 reaction on platinum and palladium surfaces: Experiment and stochastic models

Light at the interface: the potential of attenuated total reflection infrared spectroscopy for understanding heterogeneous catalysis in water

“…A valuable approach to analysing fundamental catalytic principles of supported noble metal catalysts is to investigate the conversion of a small and simple molecule, such as CO. CO adsorption and oxidation has been widely studied on single crystals and catalysts. 1,[26][27][28][29] Many papers reported on the interaction between CO and metal particles visualized by a shift in the infrared absorption bands of CO. Moreover, metal support interactions affecting the electronic structure of the metal particles also in turn influence the CO coordination on the metal particles, which can be detected with infrared spectroscopy.…”

“…28,[30][31][32]34,35 Although the reaction looks very simple, various phenomena have been reported when performed over noble metal surfaces such as island formation of adsorbates, rate oscillations and metal surface restructuring. 26,27,37 Also orders in carbon monoxide and oxygen were reported to vary between À1 and +1 depending on reaction conditions via the surface coverage of CO ads and O ads . 26,38 The adsorption and oxidation of CO on supported noble metal catalysts as well as single crystals has been investigated extensively, and some studies reported an increase in oxidation rate in the presence of water.…”

Stochastic Models of Physicochemical Processes in Catalytic Reactions - Self-Oscillations and Chemical Waves in CO Oxidation Reaction

“…The detailed reaction mechanism used in the simulation of the self-oscillations [20][21][22][23][24] is based on experimental data, reported earlier [11][12][13][14][15][16][17]. It has been revealed that the self-oscillations of the CO oxidation rate are related with the reversible phase transition Pt(100)-(hex) ↔ (1 x 1).…”

“…The shortened sequence of steps (I)-(V) [29] has frequently been used in the simulation of oscillations in catalytic oxidation reactions using either differential equations (see earlier re-Theory and Applications of Monte Carlo Simulations views [13,20]), or kinetic Monte Carlo methods [20], including our first study [31]. In our later studies [32][33][34][35][36][37][38], the conventional steps (1)-(5) in Scheme 2 were supplemented with the possible formation and consumption of the surface species CO ads O sub (steps (6) and (7)). Note that steps (6) and (7) diminish the range of existence of oscillations in the (T, P i ) space.…”

Comparative Investigation of Chemical Vapor Deposition of Palladium Nanoparticles on Different Carbon Substrates

“…This is due to the unique physicochemical properties and the importance of palladium nanoparticles (1,2). Pd nanoparticles are widely used in electronic (3), gas sensors (4,5), and inorganic membranes for hydrogen separation (6,7).…”