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A structural model for gas—solid reactions with a moving boundary
J. Szekely,James Evans +1 more
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In this paper, an alternative representation is proposed by describing the progress of the reaction in terms of the porosity, grain size, gas phase and solid state diffusivities and a heterogeneous reaction rate constant, which is now independent of structure.About:
This article is published in Chemical Engineering Science.The article was published on 1970-01-01. It has received 428 citations till now. The article focuses on the topics: Reaction rate constant.read more
Citations
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A random pore model for fluid‐solid reactions: I. Isothermal, kinetic control
TL;DR: In this paper, a random pore model is developed for fluid-solid reactions, which allows for arbitrary pore size distributions in the reacting solid. But the model is not suitable for the case of gasification, and it cannot represent the behavior of a system that shows a maximum in reaction rate as well as one that does not.
Journal ArticleDOI
Hydrogen Sulfide Capture: From Absorption in Polar Liquids to Oxide, Zeolite, and Metal-Organic Framework Adsorbents and Membranes.
TL;DR: This Review attempts to exhaustively compile the existing literature on sour gas sweetening and to identify promising areas for future developments in the field.
Journal ArticleDOI
Statistical and continuum models of fluid-solid reactions in porous media
TL;DR: In this article, the authors discuss past theoretical works on fluid-solid reactions in a porous medium and discuss the fundamental role of connectivity of the porous medium in such phenomena, and compare two different modelling approaches to reactions accompanied by structural changes.
Journal ArticleDOI
A structural model for gas-solid reactions with a moving boundary—III: A general dimensionless representation of the irreversible reaction between a porous solid and a reactant gas
Hong Yong Sohn,J. Szekely +1 more
TL;DR: In this paper, a general structural model is developed for the description of non-catalytic gas-solid reactions; which allows for spherical and flat plate like pellets, made up of spherical or flat plate-like grains.
References
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Journal ArticleDOI
Flow and Diffusion of Gases in Porous Media
TL;DR: A generalized treatment of gas transport in porous media is presented as developed on the basis of the ''dusty gas'' model, a model in which a porous medium is described as consisting of uniformly distributed, giant molecules (dust) held stationary in space as mentioned in this paper.
Journal ArticleDOI
Gaseous Diffusion in Porous Media at Uniform Pressure
TL;DR: In this article, a model for the diffusion of gases in porous media in the absence of pressure gradients is presented, in which the porous medium is visualized as a collection of uniformly distributed ''dust'' particles which are constrained to be stationary.
Journal ArticleDOI
Comparison of kinetic and diffusional models for solid-gas reactions.
M. Ishida,C. Y. Wen +1 more
TL;DR: Kinetic and diffusion models for gas-solid reactions in spherical particle, comparing core shrinking mechanism and activation energies are presented in this article, where the core is assumed to be a spherical sphere.
Journal ArticleDOI
A structural model for gas-solid reactions with a moving boundary-II: The effect of grain size, porosity and temperature on the reaction of porous pellets
J. Szekely,James Evans +1 more
TL;DR: In this article, a structural model is presented for the non-catalytic reaction between a porous solid and a gas stream, which incoporates parameters such as solid grain size, porosity, effective pore diffusion coefficient and allows the quantitative assessment of the role played by these in determining the overall reaction rate.
Journal ArticleDOI
Accuracy of the pseudo steady state approximation for moving boundary diffusion problems
TL;DR: In this article, a better approximation to the exact solution has been derived in order to estimate the accuracy of the pseudo-steady state method for heterogeneous solid-fluid chemical reactions with a moving boundary.
Related Papers (5)
A random pore model for fluid‐solid reactions: I. Isothermal, kinetic control
A structural model for gas-solid reactions with a moving boundary—III: A general dimensionless representation of the irreversible reaction between a porous solid and a reactant gas
Hong Yong Sohn,J. Szekely +1 more