Observable multiplicity features of inhomogeneous solutions measured by the thermochemic method: Theory and experiments

M. Sheintuch; J. Schmidt

doi:10.1080/00986448608911345

Observable multiplicity features of inhomogeneous solutions measured by the thermochemic method: Theory and experiments

M. Sheintuch, J. Schmidt

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

21 Scopus citations

Abstract

The thermochemic method, where the catalyst temperature is manipulated by Joule-heating, may falsify the underlying kinetics by inducing inhomogeneous solutions. This work analyzes the multiplicity and stability of these states in a wire with uniform activity with or without gaps in heat conduction. Measurements of integral properties may indicate the existence of inhomogeneities either by the existence of characteristic multiplicity patterns and bifurcation maps or by unique quantitative features. These tests are employed to show that the two intermediate branches, out of four observed in ammonia oxidation, are inhomogeneous solutions induced by lack of communication. The measured bifurcation set, separating the domains of existence of the four states, is mapped in the three dimensional soace of reactants concentrations and temoerature.

Original language	English
Pages (from-to)	33-52
Number of pages	20
Journal	Chemical Engineering Communications
Volume	44
Issue number	1-6
DOIs	https://doi.org/10.1080/00986448608911345
State	Published - Jun 1986
Externally published	Yes

Keywords

Ammonia oxidation
Steady state multiplicity

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10.1080/00986448608911345

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abstract = "The thermochemic method, where the catalyst temperature is manipulated by Joule-heating, may falsify the underlying kinetics by inducing inhomogeneous solutions. This work analyzes the multiplicity and stability of these states in a wire with uniform activity with or without gaps in heat conduction. Measurements of integral properties may indicate the existence of inhomogeneities either by the existence of characteristic multiplicity patterns and bifurcation maps or by unique quantitative features. These tests are employed to show that the two intermediate branches, out of four observed in ammonia oxidation, are inhomogeneous solutions induced by lack of communication. The measured bifurcation set, separating the domains of existence of the four states, is mapped in the three dimensional soace of reactants concentrations and temoerature.",

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AB - The thermochemic method, where the catalyst temperature is manipulated by Joule-heating, may falsify the underlying kinetics by inducing inhomogeneous solutions. This work analyzes the multiplicity and stability of these states in a wire with uniform activity with or without gaps in heat conduction. Measurements of integral properties may indicate the existence of inhomogeneities either by the existence of characteristic multiplicity patterns and bifurcation maps or by unique quantitative features. These tests are employed to show that the two intermediate branches, out of four observed in ammonia oxidation, are inhomogeneous solutions induced by lack of communication. The measured bifurcation set, separating the domains of existence of the four states, is mapped in the three dimensional soace of reactants concentrations and temoerature.

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Observable multiplicity features of inhomogeneous solutions measured by the thermochemic method: Theory and experiments

Abstract

Keywords

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