Au/CeO2 Catalysts: Structure and CO Oxidation Activity

Centeno, M.A.; Reina, Tomás Ramírez; Ivanova, Svetlana; Laguna, Óscar H.; Odriozola, J.A.

doi:10.3390/catal6100158

Cited by 64 publications

(61 citation statements)

References 210 publications

(294 reference statements)

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“…Then the reactor was cooled down to room temperature and a flow of H 2 was replaced by nitrogen. After purging the sample, the pulses of 0.05 cm 3 CO were introduced on the reactor using a six-way valve. The amount of adsorbed CO was calculated from the sum of CO pulses consumed by the catalyst, using FUJI IR gas analyzer.…”

Section: Methodsmentioning

confidence: 99%

“…CO abatement is necessary because this extremely toxic, color-, odor-and tasteless gas presents a mortal threat to human and animal health. The catalytic oxidation of CO has been studied on numerous both metallic and oxide catalysts over the years [1][2][3][4][5][6][7]. The mixture of copper and manganese oxides (hopcalite) or gold deposited on some metal oxides exhibits very high activity towards the lowtemperature oxidation of CO [8,9].…”

Section: Introductionmentioning

confidence: 99%

“…To avoid it, several hydrogen processing steps, including the removal of CO (more effective low temperature WGSR, preferential CO oxidation in the presence of hydrogen (PROX) must be developed. So far, the most promising catalytic systems for low temperature WGSR include Pt or Au catalysts supported on reducible oxides, mainly CeO 2 , TiO 2 [3,4] and very recently molybdenum carbides [5]. The photocatalytic oxidation of CO can be one of the alternative methods of carbon monoxide neutralization.…”

Section: Introductionmentioning

confidence: 99%

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Photocatalytic CO oxidation with water over Pt/TiO2 catalysts

Czupryn

Kocemba

Rynkowski

2017

Reac Kinet Mech Cat

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This paper reports that Pt/TiO 2 and to some extent, Pt/Al 2 O 3 and Pt/SiO 2 catalysts show some activity in the photocatalytic oxidation of CO by water at low temperature (\ 100°C) in the absence of oxygen. For Pt/TiO 2 catalysts, CO conversion is dependent on the Pt loading as well as the temperature of their reduction. There are an optimal platinum loading (5 wt%) and catalyst reduction temperature (500°C) ensuring the best photocatalytic efficiency. Catalytic performance results from the combined effects of electron-hole photogeneration and partial photodesorption of CO from the platinum surface, followed by the adsorption and subsequent dissociation of H 2 O. The probable mechanism of photooxidation of CO by H 2 O was proposed.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Photocatalytic CO oxidation with water over Pt/TiO2 catalysts

Czupryn

Kocemba

Rynkowski

2017

Reac Kinet Mech Cat

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“…Gold catalysts are known to be active for the low temperature CO oxidation [27,47], and it was thus straightforward to study this system by field emission techniques. One of the advantages of this technique is to allow the study of catalytic reactions in the absence of any influence of the oxidic support, which is of great importance for the fundamental understanding of the catalytic system.…”

Section: Processes On Au Tips Propagation Waves During Co/o 2 Interacmentioning

confidence: 99%

“…This is shown in Figure 1 representing the growing trend in term of publications per year involving gold-based catalytic materials and the use of environmental microscopies. Regarding the evolution of the number of studies using gold-based catalysts, the major part of the scientific publications concern the methods used for the deposition of gold nanoparticles with very narrow and well-defined sizes [33][34][35][36][37][38][39][40][41][42][43][44][45][46][47]. Besides conflicting papers on the influence of the support materials, the effect of the size on the reactivity of gold catalysts for environmental reactions is well established.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Processes on Gold-Based Catalysts Followed by Environmental Microscopies

et al. 2017

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Abstract:Since the early discovery of the catalytic activity of gold at low temperature, there has been a growing interest in Au and Au-based catalysis for a new class of applications. The complexity of the catalysts currently used ranges from single crystal to 3D structured materials. To improve the efficiency of such catalysts, a better understanding of the catalytic process is required, from both the kinetic and material viewpoints. The understanding of such processes can be achieved using environmental imaging techniques allowing the observation of catalytic processes under reaction conditions, so as to study the systems in conditions as close as possible to industrial conditions. This review focuses on the description of catalytic processes occurring on Au-based catalysts with selected in situ imaging techniques, i.e., PEEM/LEEM, FIM/FEM and E-TEM, allowing a wide range of pressure and material complexity to be covered. These techniques, among others, are applied to unravel the presence of spatiotemporal behaviours, study mass transport and phase separation, determine activation energies of elementary steps, observe the morphological changes of supported nanoparticles, and finally correlate the surface composition with the catalytic reactivity.

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Sampling Real‐Time Atomic Dynamics in Metal Nanoparticles by Combining Experiments, Simulations, and Machine Learning

Cioni,

Delle Piane,

Polino

et al. 2024

Advanced Science

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Even at low temperatures, metal nanoparticles (NPs) possess atomic dynamics that are key for their properties but challenging to elucidate. Recent experimental advances allow obtaining atomic‐resolution snapshots of the NPs in realistic regimes, but data acquisition limitations hinder the experimental reconstruction of the atomic dynamics present within them. Molecular simulations have the advantage that these allow directly tracking the motion of atoms over time. However, these typically start from ideal/perfect NP structures and, suffering from sampling limits, provide results that are often dependent on the initial/putative structure and remain purely indicative. Here, by combining state‐of‐the‐art experimental and computational approaches, how it is possible to tackle the limitations of both approaches and resolve the atomistic dynamics present in metal NPs in realistic conditions is demonstrated. Annular dark‐field scanning transmission electron microscopy enables the acquisition of ten high‐resolution images of an Au NP at intervals of 0.6 s. These are used to reconstruct atomistic 3D models of the real NP used to run ten independent molecular dynamics simulations. Machine learning analyses of the simulation trajectories allow resolving the real‐time atomic dynamics present within the NP. This provides a robust combined experimental/computational approach to characterize the structural dynamics of metal NPs in realistic conditions.

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Au/CeO2 Catalysts: Structure and CO Oxidation Activity

Cited by 64 publications

References 210 publications

Photocatalytic CO oxidation with water over Pt/TiO2 catalysts

Photocatalytic CO oxidation with water over Pt/TiO2 catalysts

Dynamic Processes on Gold-Based Catalysts Followed by Environmental Microscopies

Sampling Real‐Time Atomic Dynamics in Metal Nanoparticles by Combining Experiments, Simulations, and Machine Learning

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