Theory of Noncatalytic Gas-Solid Reactions

Lacey, D. T.; Bowen, J.H.; Basden, K. S.

doi:10.1021/i160015a007

Cited by 34 publications

(12 citation statements)

References 1 publication

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“…These can be grouped as homogeneous or as shrinking core models. The former were developed independently by Walker et al (1959) for gasification and by Ausman and Watson (1962) for catalyst regeneration and Lacey et al (1965) for absorption of SO2 by Mn02. In these models and their more recent extensions (Ishida and Wen, 1968;Kit0 et al, 1969;, the heterogeneous reaction proceeds throughout the solid, but at rates depending upon the radial position of the point and the effective diffusivity.…”

Section: Scopementioning

confidence: 99%

Gasification: Part I. Isothermal, kinetic control model for a solid with a pore size distribution

Hashimoto

Silveston

1973

AIChE Journal

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A model describing the development of specific surface area, volume, porosity, and mean pore radius of a porous solid with extent of gasification is developed based on consideration of pore size growth, initiation of new pores, and coalescence of adjacent pores. Use of population balances and formulation of the properties as moments of the pore size distribution leads to a mathematically simple, closed set of equations for kinetically controlled gasification. The model successfully predicts maximums in specific surface area and number of pores observed by Kawahata and Walker (1962) in the activation of devolatilized anthracite by COz in a fluidized bed.

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Section: Scopementioning

confidence: 99%

Gasification: Part I. Isothermal, kinetic control model for a solid with a pore size distribution

Hashimoto

Silveston

1973

AIChE Journal

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“…Various popular models for gas-solid reactions include the diffusion with simultaneous reaction model, the shrinking core model (Levenspiel, 1972;Lacey et al, 1965), the two-stage zone model (Ishida and Wen, 1968), and the structural models (Szekely et al, 1976). These models describe what is normally observed experimentally: the conversion of solid reactant to product which starts either on the outside and moves inward or starts everywhere in the particle but preferentially on the outside.…”

Section: Introductionmentioning

confidence: 99%

Self-inhibited rate in gas-solid noncatalytic reactions: the "rotten apple" phenomenon and multiple reaction pathways

Erk¹,

Duduković²

1983

Ind. Eng. Chem. Fund.

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The self-inhibited rate form (bimolecular Langmuk-Hinshelwood rate) is Incorporated in the diffusion with simultaneous reaction model (DSRM) to describe the progress of a noncatalytlc gas-solid reaction in a spherical solid particle. The model wRh this rate form, solved numerically by orthogonal collocation, provides a plausible explanation for the "rotten apple" phenomenon (internal burning) which occurs when the reaction begins in the interior of the solid particle and progresses outwards. It is shown that the position of the highest reaction rate in the solid particle depends on model parameters. It is also shown that at given gas reactant concentration, solid particle size, and initial soli reactant concentration, muttiple solki conversion histories are possible for a certain range of parameters.C$ = gaseous reactant concentration, kmol/m3 C, = gaseous reactant concentration in the bulk, kmol/m3 CB = solid reactant concentration in the particle, kmol/m3 CBo = initial solid reactant concentration, kmol/m3 De = effective diffusivity of the gas reactant in the solid Conversion when particle, m"/s kl = rate constant for the self-inhibited rate, (m3/kmol)P s-l k2 = parameter in the self-inhibited rate form, m3/kmol K = self-inhibition constant (k2Cb), dimensionless

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“…The computed char conversion for the nth order kinetics is modeled by the volumetric reaction expression [39,40] shown by Eq. (20).…”

Section: Intrinsic Reaction Ratesmentioning

confidence: 99%

A study of high pressure pinewood char gasification with CO2

Sircar¹,

Sane²,

Weichao³

et al. 2014

Fuel

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Theory of Noncatalytic Gas-Solid Reactions

Cited by 34 publications

References 1 publication

Gasification: Part I. Isothermal, kinetic control model for a solid with a pore size distribution

Gasification: Part I. Isothermal, kinetic control model for a solid with a pore size distribution

Self-inhibited rate in gas-solid noncatalytic reactions: the "rotten apple" phenomenon and multiple reaction pathways

A study of high pressure pinewood char gasification with CO2

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