Water‐gas shift reaction kinetics over μ‐structured Pt/CeO2/Al2O3 catalysts

Germani, G.; Schuurman, Y.

doi:10.1002/aic.10764

Cited by 72 publications

(53 citation statements)

References 44 publications

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“…CO 2 causes a small but significant, inhibiting effect on the ceria-supported catalyst. Germani et al [3] reported quite similar orders and a similar activation energy for a Pt/CeO 2 /Al 2 O 3 catalyst. Panagiotopoulou and Kondarides [8] reported a value of the activation energy of 89 kJ/mol for a Pt/ceria catalyst and 50-71 kJ/mol for Pt/TiO 2 catalyst depending on the particle size of the TiO 2 crystallites [9].…”

Section: Resultssupporting

confidence: 56%

“…The sequence of elementary steps, initially proposed over Pt supported catalysts by Germani et al [3], described in the introduction is used here as a basis for the kinetic study on our catalysts.…”

Section: Resultsmentioning

confidence: 99%

“…Germani et al [3] proposed a dual-site mechanism that describes the WGS over Pt/CeO 2 -Al 2 O 3 catalyst:…”

Section: Introductionmentioning

confidence: 99%

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Kinetics and Mechanism of the Water–Gas Shift Reaction Over Platinum Supported Catalysts

et al. 2009

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A dual-site reaction mechanism is proposed for Pt based water-gas shift catalysts. The sorption equilibrium parameters are evaluated in detail to validate their physical significance. The values of the van 't Hoff parameters for CO and H 2 correspond to those for chemisorption on platinum. The sorption parameters of H 2 O and CO 2 on the supports have been quantitatively determined from temperature-programmed desorption experiments and have been compared to the values obtained from the kinetic study. Finally the proposed model is able to explain the different activities between the two catalysts.Keywords WGS Á Temperature-programmed desorption Á Dual-site Á CeO 2 Á TiO 2 Á Water adsorption List of symbols e bReactor void space m 3 gas m À3 reactor C i Gas phase concentration of species i mol m À3 gas h i Surface coverage of species i (-) D ax,i Axial diffusion coefficient m 3 gas m À1 reactor s À1

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Section: Resultssupporting

confidence: 56%

Section: Resultsmentioning

confidence: 99%

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Kinetics and Mechanism of the Water–Gas Shift Reaction Over Platinum Supported Catalysts

et al. 2009

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“…alumina [19,20], and contrary to the results of Haryanto et al [10] who reported that the system Pt/CeO 2 /Al 2 O 3 did not show any activity for the WGS reaction at 300°C. Maximum temperature at which the activity of the catalyst towards WGS reaction begins to decline also depends on the operating conditions.…”

Section: Catalyst Performance Evaluationcontrasting

confidence: 56%

Study of the Suitability of a Pt-Based Catalyst for the Upgrading of a Biomass Gasification Syngas Stream via the WGS Reaction

Maroño¹,

Sanchez²,

Ruiz³

et al. 2008

Catal Lett

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In this article, the catalytic activity of a Ptbased water gas shift (WGS) catalyst is presented. The experimental study has been conducted under realistic conditions typical of pressurised oxygen gasification. The effect of temperature, space velocity, steam to carbon monoxide ratio, and gas composition on the performance of the catalyst is investigated. Despite the high CO content in the feed gas, ranging from 32% to 60% v/v, dry basis, the catalyst has shown very good performance at intermediate temperature, 300-450°C. Carbon monoxide concentration at the reactor outlet reached values below 3% what is comparable with conventional high-temperature, first-stage WGS catalysts.

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“…[4] There is al ong-standing and widespread hope that these severe limitations in material space could be overcome by bifunctional catalysts,w hich couple two different active-site types,each catalyzing aparticular reaction step. [5][6][7] Herein, we focus on the diffusional coupling between active sites located in spatially distinct regions.Such spillover mechanisms have been proposed between metal particles and metal supports [8,9] or, more commonly,b etween metal particles and non-metal supports. [10][11][12] In the spirit of developing an understanding of trends and limitations,the present work employs descriptor-based approaches to generally assess the performance gains that are possible through diffusive coupling.…”

mentioning

confidence: 99%

Analyzing the Case for Bifunctional Catalysis

et al. 2016

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Bifunctional coupling of two different catalytic site types has often been invoked to explain experimentally observed enhanced catalytic activities. We scrutinize such claims with generic scaling-relation-based microkinetic models that allow exploration of the theoretical limits for such a bifunctional gain for several model reactions. For sites at transition-metal surfaces, the universality of the scaling relations between adsorption energies largely prevents any improvements through bifunctionality. Only the consideration of systems that involve the combination of different materials, such as metal particles on oxide supports, offers hope for significant bifunctional gains.

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Water‐gas shift reaction kinetics over μ‐structured Pt/CeO₂/Al₂O₃ catalysts

Cited by 72 publications

References 44 publications

Kinetics and Mechanism of the Water–Gas Shift Reaction Over Platinum Supported Catalysts

Kinetics and Mechanism of the Water–Gas Shift Reaction Over Platinum Supported Catalysts

Study of the Suitability of a Pt-Based Catalyst for the Upgrading of a Biomass Gasification Syngas Stream via the WGS Reaction

Analyzing the Case for Bifunctional Catalysis

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