Steady-state diffusion and reactions in catalytic fractal porous media

Tamar Elias-Kohav; Sheintuch Moshe; David Avnir

doi:10.1016/0009-2509(91)85148-Q

Steady-state diffusion and reactions in catalytic fractal porous media

Tamar Elias-Kohav, Sheintuch Moshe^*, David Avnir

^*Corresponding author for this work

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

96 Scopus citations

Abstract

Diffusion-controlled processes in porous structures are analyzed using planar stochastic fractal objects, which are related to known preparation procedures of porous materials. The fractal objects are cluster-cluster aggregates, the "negative" of cluster-cluster aggregates (i.e. pore fractal), diffusion-limited and reaction-limited aggregates. Random clusters are also constructed for comparison purposes. The processes considered in this study are diffusion driven by an externally imposed concentration gradient and diffusion driven by reaction. The results are presented in the form of concentration contours, effective tortuosities and reaction effectiveness factors. These classes of fractal objects differ in their effective properties (summarized by a tortuosity-porosity relation) and differ from the behavior of fully random objects. This work suggests that tortuosity predictions should be classified according to the manufacturing method of the catalyst.

Original language	English
Pages (from-to)	2787-2798
Number of pages	12
Journal	Chemical Engineering Science
Volume	46
Issue number	11
DOIs	https://doi.org/10.1016/0009-2509(91)85148-Q
State	Published - 1991
Externally published	Yes

Access to Document

10.1016/0009-2509(91)85148-Q

Cite this

@article{43f2fb5696914d9ea642d533bded1f46,

title = "Steady-state diffusion and reactions in catalytic fractal porous media",

abstract = "Diffusion-controlled processes in porous structures are analyzed using planar stochastic fractal objects, which are related to known preparation procedures of porous materials. The fractal objects are cluster-cluster aggregates, the {"}negative{"} of cluster-cluster aggregates (i.e. pore fractal), diffusion-limited and reaction-limited aggregates. Random clusters are also constructed for comparison purposes. The processes considered in this study are diffusion driven by an externally imposed concentration gradient and diffusion driven by reaction. The results are presented in the form of concentration contours, effective tortuosities and reaction effectiveness factors. These classes of fractal objects differ in their effective properties (summarized by a tortuosity-porosity relation) and differ from the behavior of fully random objects. This work suggests that tortuosity predictions should be classified according to the manufacturing method of the catalyst.",

author = "Tamar Elias-Kohav and Sheintuch Moshe and David Avnir",

note = "Funding Information: Acknowledgements-M. S. thanks the Henri Gutwirth Fund for the Promotion of Research for support. D. A. thanks the U.S.-Israel Binational Science Foundation and the Wolfson Foundation for support.",

year = "1991",

doi = "10.1016/0009-2509(91)85148-Q",

language = "英语",

volume = "46",

pages = "2787--2798",

journal = "Chemical Engineering Science",

issn = "0009-2509",

publisher = "Elsevier BV",

number = "11",

}

TY - JOUR

T1 - Steady-state diffusion and reactions in catalytic fractal porous media

AU - Elias-Kohav, Tamar

AU - Moshe, Sheintuch

AU - Avnir, David

N1 - Funding Information: Acknowledgements-M. S. thanks the Henri Gutwirth Fund for the Promotion of Research for support. D. A. thanks the U.S.-Israel Binational Science Foundation and the Wolfson Foundation for support.

PY - 1991

Y1 - 1991

N2 - Diffusion-controlled processes in porous structures are analyzed using planar stochastic fractal objects, which are related to known preparation procedures of porous materials. The fractal objects are cluster-cluster aggregates, the "negative" of cluster-cluster aggregates (i.e. pore fractal), diffusion-limited and reaction-limited aggregates. Random clusters are also constructed for comparison purposes. The processes considered in this study are diffusion driven by an externally imposed concentration gradient and diffusion driven by reaction. The results are presented in the form of concentration contours, effective tortuosities and reaction effectiveness factors. These classes of fractal objects differ in their effective properties (summarized by a tortuosity-porosity relation) and differ from the behavior of fully random objects. This work suggests that tortuosity predictions should be classified according to the manufacturing method of the catalyst.

AB - Diffusion-controlled processes in porous structures are analyzed using planar stochastic fractal objects, which are related to known preparation procedures of porous materials. The fractal objects are cluster-cluster aggregates, the "negative" of cluster-cluster aggregates (i.e. pore fractal), diffusion-limited and reaction-limited aggregates. Random clusters are also constructed for comparison purposes. The processes considered in this study are diffusion driven by an externally imposed concentration gradient and diffusion driven by reaction. The results are presented in the form of concentration contours, effective tortuosities and reaction effectiveness factors. These classes of fractal objects differ in their effective properties (summarized by a tortuosity-porosity relation) and differ from the behavior of fully random objects. This work suggests that tortuosity predictions should be classified according to the manufacturing method of the catalyst.

UR - http://www.scopus.com/inward/record.url?scp=0026395604&partnerID=8YFLogxK

U2 - 10.1016/0009-2509(91)85148-Q

DO - 10.1016/0009-2509(91)85148-Q

M3 - 文章

AN - SCOPUS:0026395604

SN - 0009-2509

VL - 46

SP - 2787

EP - 2798

JO - Chemical Engineering Science

JF - Chemical Engineering Science

IS - 11

ER -

Steady-state diffusion and reactions in catalytic fractal porous media

Abstract

Access to Document

Other files and links

Fingerprint

Cite this