The palladium catalysed oxidation of methane: reaction kinetics and the effect of diffusion barriers

Hayes, Robert E.; Kolaczkowski, S.T.; Li, Paul K.C.; Awdry, Serpil

doi:10.1016/s0009-2509(01)00131-2

Cited by 97 publications

(61 citation statements)

References 30 publications

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“…In this way, the kinetic parameters obtained should be treated as apparent and they will be used for exclusively simulations in order to compare different reactor internals and catalysts. Similar effects of mass transport limitations have already been reported for methane oxidation by a number of authors [19][20][21]. The results of the simulations performed for methane and carbon monoxide combustion over the cobalt and palladium catalysts applied for the wire gauze and monolithic reactors are presented in Fig.…”

Section: Reactor Performancesupporting

confidence: 79%

A Comparison Between Monolithic and Wire Gauze Structured Catalytic Reactors for CH4 and CO Removal from Biogas-Fuelled Engine Exhaust

et al. 2013

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The application of the wire gauzes as the catalytic supports can provide a number of advantages in biogas exhaust abatement. In this paper, a model of wire gauze structured reactor for biogas exhaust removal is proposed and model based calculations are performed to compare the wire gauze catalytic reactor with the classic monolith. The modelling bases on kinetic data experimentally obtained in a small-scale tubular reactor for cobalt and palladium (as reference) oxide catalysts doped with promoters (Ce, Pd). The heat and mass transfer characteristics of the wire gauze reactor are taken from the former studies by the authors. The simulations show that for assumed reactor parameters, a combination of the promoted cobalt oxide catalyst and the wire gauze support can give high conversion of methane and carbon monoxide. Keywords

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Section: Reactor Performancesupporting

confidence: 79%

A Comparison Between Monolithic and Wire Gauze Structured Catalytic Reactors for CH4 and CO Removal from Biogas-Fuelled Engine Exhaust

et al. 2013

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“…26,27 As oxygen is generally in great excess with respect to methane, oxygen concentration remains constant, being the reaction rate independent from this parameter. Arrhenius dependence of the kinetic constant has also been assumed.…”

Section: Determination Of the Kinetic Parametersmentioning

confidence: 99%

Monoliths as suitable catalysts for reverse‐flow combustors: Modeling and experimental validation

Marín¹,

Ordóñez²,

Dı́ez³

2010

AIChE Journal

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The performance of a bench-scale monolithic reverse-flow reactor (RFR) for methane combustion has been experimentally studied in this work. The influence of the different operating parameters, such as total gas flow rate (2.5 Â 10(STP)), methane inlet concentration (1000-5500 ppm), and switching time (300-900 s) on the reactor performance (outlet conversion and stability), has been experimentally determined. The validation of a heterogeneous one-dimensional dynamic model for monolithic beds with the obtained experimental data allows the use of this model to simulate the behavior of industrial-scale reactors. In the second part of the work, a systematic comparison of particulate and monolithic RFRs is carried out through design curves. Reactor length for 99% outlet conversion and the corresponding pressure drop is determined for varying operating conditions (surface velocity and inlet methane concentration).

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“…The figure demonstrates a significant difference between the three types of models with the Liu et al simplification for parallel pore diffusion demonstrating similar results as the more in-depth calculation. If a choice had to be made between diffusion models, the parallel pore model is widely utilized and has been proven to provide good accuracy in comparison to experiments [23,30,34,36,37,54,61].…”

Section: Resultsmentioning

confidence: 99%

One + One‐Dimensional Modeling of Monolithic Catalytic Converters

Depcik

Srinivasan

2011

Chem Eng & Technol

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The inclusion of a washcoat model into monolithic catalyst simulations in order to create a one + one-dimensional framework using a minimum number of parameters is reviewed. All assumptions and numerical methods are presented while ensuring the prevention of excessive temperature excursions. Parametric studies illustrate the influence of model parameters (porosity, wall thickness, pore diameter) on the conversion of carbon monoxide during a light-off experiment using a uniform washcoat. Moreover, simulating a layered washcoat of dissimilar catalytic materials demonstrates a significant influence on conversion characteristics depending on the order of the layers. As a result, employing a washcoat requires careful consideration of the advection of the gas, the reactions occurring in each catalytic material, material layering, the diffusion properties of the different species, and the characteristics of the washcoat.

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The palladium catalysed oxidation of methane: reaction kinetics and the effect of diffusion barriers

Cited by 97 publications

References 30 publications

A Comparison Between Monolithic and Wire Gauze Structured Catalytic Reactors for CH4 and CO Removal from Biogas-Fuelled Engine Exhaust

A Comparison Between Monolithic and Wire Gauze Structured Catalytic Reactors for CH4 and CO Removal from Biogas-Fuelled Engine Exhaust

Monoliths as suitable catalysts for reverse‐flow combustors: Modeling and experimental validation

One + One‐Dimensional Modeling of Monolithic Catalytic Converters

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