LrgpV1, Main, Exploration, bibRecord, 003401

Intraparticle‐forced convection effect in catalyst diffusivity measurements and reactor design

Identifieur interne : 003401 ( Main/Exploration ); précédent : 003400; suivant : 003402

Intraparticle‐forced convection effect in catalyst diffusivity measurements and reactor design

Auteurs : A. E. Rodrigues [Portugal] ; Bum J. Ahn [France] ; André Zoulalian [France]

Source :

AIChE Journal [ 0001-1541 ] ; 1982-07.

RBID : ISTEX:29A56ECA9CABD43796022D2167608702D39FF35A

English descriptors

Abstract

Intraparticle forced convection was considered in order to explain experimentally observed changes in effective diffusivity (apparent) with flowrate, when measures are carried out in fixed beds. A complete model taking into account intraparticle diffusion and forced convection together with film diffusion is derived in order to analyze diffusivity measurements by physical methods, both in perfectly mixed reactors and fixed beds. The experiments were carried out with hydrogen tracer in a partial oxydation catalyst. Implications of the use of such “apparent” effective diffusivities in reactor design are discussed, showing that errors of 100% can be made.

Url:

https://api.istex.fr/document/29A56ECA9CABD43796022D2167608702D39FF35A/fulltext/pdf

DOI: 10.1002/aic.690280404

Affiliations:

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Le document en format XML

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<author><name sortKey="Rodrigues, A E" sort="Rodrigues, A E" uniqKey="Rodrigues A" first="A. E." last="Rodrigues">A. E. Rodrigues</name>
</author>
<author><name sortKey="Ahn, Bum J" sort="Ahn, Bum J" uniqKey="Ahn B" first="Bum J." last="Ahn">Bum J. Ahn</name>
</author>
<author><name sortKey="Zoulalian, Andre" sort="Zoulalian, Andre" uniqKey="Zoulalian A" first="André" last="Zoulalian">André Zoulalian</name>
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<publisher>American Institute of Chemical Engineers</publisher>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Alche journal</term>
<term>Axial dispersion</term>
<term>Axial dispersion coefficient</term>
<term>Catalyst</term>
<term>Catalyst particle</term>
<term>Characteristic roots</term>
<term>Chem</term>
<term>Complete model</term>
<term>Complex reactions</term>
<term>Convection</term>
<term>Convection effect</term>
<term>Convection term</term>
<term>Deff</term>
<term>Diffusion time</term>
<term>Diffusivities</term>
<term>Diffusivity</term>
<term>Diffusivity measurements</term>
<term>Dimensionless</term>
<term>Dimensionless thiele modulus</term>
<term>Effective diffusivities</term>
<term>Effective diffusivity</term>
<term>Effectiveness factor</term>
<term>Effectiveness factors</term>
<term>Experimental results</term>
<term>Experimental values</term>
<term>External diffusion time</term>
<term>Film diffusion</term>
<term>Flowrate</term>
<term>Hydrogen tracer</term>
<term>Impulse response</term>
<term>Intraparticle</term>
<term>Intraparticle convection</term>
<term>Intraparticle convection time</term>
<term>Intraparticle convective flow</term>
<term>Intraparticle peclet number</term>
<term>Intraparticle porosity</term>
<term>Lamelar structure</term>
<term>Large pore catalysts</term>
<term>Maleic anhydride</term>
<term>Model equations</term>
<term>Modulus</term>
<term>Nonadsorbable tracer</term>
<term>Optimized values</term>
<term>Overall column efficiency</term>
<term>Partial oxydation</term>
<term>Partial oxydation catalyst</term>
<term>Particle diameter</term>
<term>Particle permeability</term>
<term>Particle space</term>
<term>Peclet</term>
<term>Permeability</term>
<term>Phosphorus oxydes</term>
<term>Pore</term>
<term>Pore diameter</term>
<term>Porosity</term>
<term>Porous catalyst</term>
<term>Practical purposes</term>
<term>Pressure drop</term>
<term>Rate parameters</term>
<term>Reactor</term>
<term>Reactor design</term>
<term>Reynolds number</term>
<term>Rhone poulenc</term>
<term>Sharp variations</term>
<term>Simplified model</term>
<term>Simultaneous intraparticle</term>
<term>Slab geometry</term>
<term>Specific area</term>
<term>Superficial velocity</term>
<term>Thiele</term>
<term>Thiele modulus</term>
<term>Tortuosity factor</term>
<term>Transfer function</term>
<term>True diffusion time</term>
<term>Tube diameter</term>
<term>Unsteady state methods</term>
<term>Vapor entrainment</term>
</keywords>
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<term>Axial dispersion</term>
<term>Axial dispersion coefficient</term>
<term>Catalyst</term>
<term>Catalyst particle</term>
<term>Characteristic roots</term>
<term>Chem</term>
<term>Complete model</term>
<term>Complex reactions</term>
<term>Convection</term>
<term>Convection effect</term>
<term>Convection term</term>
<term>Deff</term>
<term>Diffusion time</term>
<term>Diffusivities</term>
<term>Diffusivity</term>
<term>Diffusivity measurements</term>
<term>Dimensionless</term>
<term>Dimensionless thiele modulus</term>
<term>Effective diffusivities</term>
<term>Effective diffusivity</term>
<term>Effectiveness factor</term>
<term>Effectiveness factors</term>
<term>Experimental results</term>
<term>Experimental values</term>
<term>External diffusion time</term>
<term>Film diffusion</term>
<term>Flowrate</term>
<term>Hydrogen tracer</term>
<term>Impulse response</term>
<term>Intraparticle</term>
<term>Intraparticle convection</term>
<term>Intraparticle convection time</term>
<term>Intraparticle convective flow</term>
<term>Intraparticle peclet number</term>
<term>Intraparticle porosity</term>
<term>Lamelar structure</term>
<term>Large pore catalysts</term>
<term>Maleic anhydride</term>
<term>Model equations</term>
<term>Modulus</term>
<term>Nonadsorbable tracer</term>
<term>Optimized values</term>
<term>Overall column efficiency</term>
<term>Partial oxydation</term>
<term>Partial oxydation catalyst</term>
<term>Particle diameter</term>
<term>Particle permeability</term>
<term>Particle space</term>
<term>Peclet</term>
<term>Permeability</term>
<term>Phosphorus oxydes</term>
<term>Pore</term>
<term>Pore diameter</term>
<term>Porosity</term>
<term>Porous catalyst</term>
<term>Practical purposes</term>
<term>Pressure drop</term>
<term>Rate parameters</term>
<term>Reactor</term>
<term>Reactor design</term>
<term>Reynolds number</term>
<term>Rhone poulenc</term>
<term>Sharp variations</term>
<term>Simplified model</term>
<term>Simultaneous intraparticle</term>
<term>Slab geometry</term>
<term>Specific area</term>
<term>Superficial velocity</term>
<term>Thiele</term>
<term>Thiele modulus</term>
<term>Tortuosity factor</term>
<term>Transfer function</term>
<term>True diffusion time</term>
<term>Tube diameter</term>
<term>Unsteady state methods</term>
<term>Vapor entrainment</term>
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<front><div type="abstract" xml:lang="en">Intraparticle forced convection was considered in order to explain experimentally observed changes in effective diffusivity (apparent) with flowrate, when measures are carried out in fixed beds. A complete model taking into account intraparticle diffusion and forced convection together with film diffusion is derived in order to analyze diffusivity measurements by physical methods, both in perfectly mixed reactors and fixed beds. The experiments were carried out with hydrogen tracer in a partial oxydation catalyst. Implications of the use of such “apparent” effective diffusivities in reactor design are discussed, showing that errors of 100% can be made.</div>
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<name sortKey="Rodrigues, A E" sort="Rodrigues, A E" uniqKey="Rodrigues A" first="A. E." last="Rodrigues">A. E. Rodrigues</name>
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Intraparticle‐forced convection effect in catalyst diffusivity measurements and reactor design

Intraparticle‐forced convection effect in catalyst diffusivity measurements and reactor design

Source :

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

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Pour mettre un lien sur cette page dans le réseau Wicri