Size dependent kinetics in a homogeneously exposed catalyst

M. Sheintuch

doi:10.1016/0009-2509(82)80122-X

Size dependent kinetics in a homogeneously exposed catalyst

M. Sheintuch^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

Analysis of an oscillatory kinetic mechanism, employing two surface concentrations with widely separated diffusivities as its dynamic variables, reveals that the apparent kinetics of a homogeneously exposed isolated catalyst may vary with its size due to emergence of asymmetric states. The rate curves, predicted by the model, pass through a maximum that is shifted to lower reactant concentrations with increasing catalyst length. The branch of the rate curve of inhomogeneous solutions may bifurcate from the homogeneous branch or may form an isola. The stability of the uniform and asymmetric solutions is considered. The rate curves predicted by the model and the length scales associated with it resemble some of the experimental observations of structure sensitivity, suggesting that the sensitivity of specific reaction rate to crystallite size may be induced by non-linear kinetics.

Original language	English
Pages (from-to)	591-599
Number of pages	9
Journal	Chemical Engineering Science
Volume	37
Issue number	4
DOIs	https://doi.org/10.1016/0009-2509(82)80122-X
State	Published - 1982
Externally published	Yes

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title = "Size dependent kinetics in a homogeneously exposed catalyst",

abstract = "Analysis of an oscillatory kinetic mechanism, employing two surface concentrations with widely separated diffusivities as its dynamic variables, reveals that the apparent kinetics of a homogeneously exposed isolated catalyst may vary with its size due to emergence of asymmetric states. The rate curves, predicted by the model, pass through a maximum that is shifted to lower reactant concentrations with increasing catalyst length. The branch of the rate curve of inhomogeneous solutions may bifurcate from the homogeneous branch or may form an isola. The stability of the uniform and asymmetric solutions is considered. The rate curves predicted by the model and the length scales associated with it resemble some of the experimental observations of structure sensitivity, suggesting that the sensitivity of specific reaction rate to crystallite size may be induced by non-linear kinetics.",

author = "M. Sheintuch",

note = "Funding Information: Acknowledgement-This work was supported by U.S.-Israel Binational Science Foundation (Grant 2586/8 1).",

year = "1982",

doi = "10.1016/0009-2509(82)80122-X",

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T1 - Size dependent kinetics in a homogeneously exposed catalyst

AU - Sheintuch, M.

N1 - Funding Information: Acknowledgement-This work was supported by U.S.-Israel Binational Science Foundation (Grant 2586/8 1).

PY - 1982

Y1 - 1982

N2 - Analysis of an oscillatory kinetic mechanism, employing two surface concentrations with widely separated diffusivities as its dynamic variables, reveals that the apparent kinetics of a homogeneously exposed isolated catalyst may vary with its size due to emergence of asymmetric states. The rate curves, predicted by the model, pass through a maximum that is shifted to lower reactant concentrations with increasing catalyst length. The branch of the rate curve of inhomogeneous solutions may bifurcate from the homogeneous branch or may form an isola. The stability of the uniform and asymmetric solutions is considered. The rate curves predicted by the model and the length scales associated with it resemble some of the experimental observations of structure sensitivity, suggesting that the sensitivity of specific reaction rate to crystallite size may be induced by non-linear kinetics.

AB - Analysis of an oscillatory kinetic mechanism, employing two surface concentrations with widely separated diffusivities as its dynamic variables, reveals that the apparent kinetics of a homogeneously exposed isolated catalyst may vary with its size due to emergence of asymmetric states. The rate curves, predicted by the model, pass through a maximum that is shifted to lower reactant concentrations with increasing catalyst length. The branch of the rate curve of inhomogeneous solutions may bifurcate from the homogeneous branch or may form an isola. The stability of the uniform and asymmetric solutions is considered. The rate curves predicted by the model and the length scales associated with it resemble some of the experimental observations of structure sensitivity, suggesting that the sensitivity of specific reaction rate to crystallite size may be induced by non-linear kinetics.

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U2 - 10.1016/0009-2509(82)80122-X

DO - 10.1016/0009-2509(82)80122-X

M3 - 文章

AN - SCOPUS:0019912573

SN - 0009-2509

VL - 37

SP - 591

EP - 599

JO - Chemical Engineering Science

JF - Chemical Engineering Science

IS - 4

ER -

Size dependent kinetics in a homogeneously exposed catalyst

Abstract

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