Reaction Rates in Fractal vs. Uniform Catalysts with Linear and Nonlinear Kinetics

C. Gavrilov; M. Sheintuch

doi:10.1002/aic.690430706

Reaction Rates in Fractal vs. Uniform Catalysts with Linear and Nonlinear Kinetics

C. Gavrilov^*, M. Sheintuch

^*Corresponding author for this work

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

26 Scopus citations

Abstract

Pore fractal objects are expected to be optimal catalysts, since material is supplied to the narrower pores, which are also shorter through the larger pores where diffusion resistance is smaller. To demonstrate this, diffusion and reaction were simulated on Sierpinski-gasket-type fractal objects and on the corresponding nonfractal uniform-pore structures of the same size, porosity and reactive area. Positive order reactions limited by Knudsen diffusion were shown to exhibit larger rates in fractal than in uniform-pore objects. Fractal catalysts also exhibited a new intermediate domain in which the rate depends only weakly on the kinetics parameters. In nonmonotonic kinetics the branching point (bifurcation point) was extremely sensitive to the pore structure.

Original language	English
Pages (from-to)	1691-1699
Number of pages	9
Journal	AICHE Journal
Volume	43
Issue number	7
DOIs	https://doi.org/10.1002/aic.690430706
State	Published - Jul 1997
Externally published	Yes

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abstract = "Pore fractal objects are expected to be optimal catalysts, since material is supplied to the narrower pores, which are also shorter through the larger pores where diffusion resistance is smaller. To demonstrate this, diffusion and reaction were simulated on Sierpinski-gasket-type fractal objects and on the corresponding nonfractal uniform-pore structures of the same size, porosity and reactive area. Positive order reactions limited by Knudsen diffusion were shown to exhibit larger rates in fractal than in uniform-pore objects. Fractal catalysts also exhibited a new intermediate domain in which the rate depends only weakly on the kinetics parameters. In nonmonotonic kinetics the branching point (bifurcation point) was extremely sensitive to the pore structure.",

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N2 - Pore fractal objects are expected to be optimal catalysts, since material is supplied to the narrower pores, which are also shorter through the larger pores where diffusion resistance is smaller. To demonstrate this, diffusion and reaction were simulated on Sierpinski-gasket-type fractal objects and on the corresponding nonfractal uniform-pore structures of the same size, porosity and reactive area. Positive order reactions limited by Knudsen diffusion were shown to exhibit larger rates in fractal than in uniform-pore objects. Fractal catalysts also exhibited a new intermediate domain in which the rate depends only weakly on the kinetics parameters. In nonmonotonic kinetics the branching point (bifurcation point) was extremely sensitive to the pore structure.

AB - Pore fractal objects are expected to be optimal catalysts, since material is supplied to the narrower pores, which are also shorter through the larger pores where diffusion resistance is smaller. To demonstrate this, diffusion and reaction were simulated on Sierpinski-gasket-type fractal objects and on the corresponding nonfractal uniform-pore structures of the same size, porosity and reactive area. Positive order reactions limited by Knudsen diffusion were shown to exhibit larger rates in fractal than in uniform-pore objects. Fractal catalysts also exhibited a new intermediate domain in which the rate depends only weakly on the kinetics parameters. In nonmonotonic kinetics the branching point (bifurcation point) was extremely sensitive to the pore structure.

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Reaction Rates in Fractal vs. Uniform Catalysts with Linear and Nonlinear Kinetics

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