Effect of sintering on the catalytic activity of a Pt based catalyst for CO oxidation: Experiments and modeling

Yang, Jian; Tschamber, Valérie; Habermacher, David; Garin, F.; Gilot, P.

doi:10.1016/j.apcatb.2008.02.018

Cited by 65 publications

(41 citation statements)

References 48 publications

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“…Since as dispersion increases, particle diameter decreases this in turn influences the bond strength. This is similar to Yang et al who wrote the reaction rate expression as a function of particle size and related the results to dispersion [86]. Hence, when ageing of the catalyst occurs through sintering, the dispersion of the catalytic material will change.…”

Section: Rate Determining Stepmentioning

confidence: 54%

“…Hence, as the particle size decreases given the same number of sites, the chemical bond strength increases which may further hinder the reaction rate as more energy is required to break the bond [80]. Numerous authors support this statement by indicating that the oxidation reaction is a strong function of particle size [22,80,85,86]. As a result, dispersion plays a large role in predicting the reaction rate expression and the authors chose this parameter as a primary variable of interest for the activation energy.…”

Section: Rate Determining Stepmentioning

confidence: 58%

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Adaptive Global Carbon Monoxide Kinetic Mechanism over Platinum/Alumina Catalysts

et al. 2013

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Carbon monoxide (CO) oxidation is one of the more widely researched mechanisms given its pertinence across many industrial platforms. Because of this, ample information exists as to the detailed reaction steps in its mechanism. While detailed kinetic mechanisms are more accurate and can be written as a function of catalytic material on the surface, global mechanisms are more widely used because of their computational efficiency advantage. This paper merges the theory behind detailed kinetics into a global kinetic model for the singular CO oxidation reaction while formulating expressions that adapt to catalyst properties on the surface such as dispersion and precious metal loading. Results illustrate that the model is able to predict the light-off and extinction temperatures during a hysteresis experiment as a function of different inlet CO concentrations and precious metal dispersion.

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Section: Rate Determining Stepmentioning

confidence: 54%

Section: Rate Determining Stepmentioning

confidence: 58%

Adaptive Global Carbon Monoxide Kinetic Mechanism over Platinum/Alumina Catalysts

et al. 2013

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“…In order to make the link between sintering of a Pt/Al 2 O 3 catalyst and its activity for the CO oxidation reaction Yang, et al, [Yang, et al, 2008] treated the catalyst (1.6% Pt) by thermal aging for different durations ranging from 15 min to 16 h, at 600 and 700 °C, under 7% O 2 . It was observed a shift of the Pt particle size distributions due to sintering towards larger diameters.…”

Section: Effect Of Sintering Over the Catalytic Activitymentioning

confidence: 99%

Sintering of Supported Metal Catalysts

Contreras¹,

Fuentes²

2012

Sintering - Methods and Products

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“…Many industrial heterogeneous catalysts [10,11] currently in use consist of metal nanoparticles with large variations in size and shape. This variation makes it very difficult to control the distribution of the active sites for different reaction products over the catalyst surfaces.…”

Section: Introductionmentioning

confidence: 99%

Selective Nanocatalysis of Organic Transformation by Metals: Concepts, Model Systems, and Instruments

Somorjai

2010

Top Catal

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Monodispersed transition metal (Pt, Rh, Pd) nanoparticles (NP) in the 0.8-15 nm range have been synthesized and are being used to probe catalytic selectivity in multipath organic transformation reactions. For NP systems, the turnover rates and product distributions depend on their size, shape, oxidation states, and their composition in case of bimetallic NP systems. Dendrimersupported platinum and rhodium NPs of less than 2 nm diameter usually have high oxidation states and can be utilized for catalytic cyclization and hydroformylation reactions which previously were produced only by homogeneous catalysis. Transition metal nanoparticles in metal core (Pt, Co)--inorganic shell (SiO 2 ) structure exhibit exceptional thermal stability and are well-suited to perform catalytic reactions at high temperatures ([400°C). Instruments developed in our laboratory permit the atomic and molecular level study of NPs under reaction conditions (SFG, ambient pressure XPS and high pressure STM). These studies indicate continuous restructuring of the metal substrate and the adsorbate molecules, changes of oxidation states with NP size and surface composition variations of bimetallic NPs with changes of reactant molecules. The facile rearrangement of NP catalysts required for catalytic turnover makes nanoparticle systems (heterogeneous, homogeneous and enzyme) excellent catalysts and provides opportunities to develop hybrid heterogeneoushomogeneous, heterogeneous-enzyme and homogeneousenzyme catalyst systems.

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Effect of sintering on the catalytic activity of a Pt based catalyst for CO oxidation: Experiments and modeling

Cited by 65 publications

References 48 publications

Adaptive Global Carbon Monoxide Kinetic Mechanism over Platinum/Alumina Catalysts

Adaptive Global Carbon Monoxide Kinetic Mechanism over Platinum/Alumina Catalysts

Sintering of Supported Metal Catalysts

Selective Nanocatalysis of Organic Transformation by Metals: Concepts, Model Systems, and Instruments

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