Equilibrium thermodynamic predictions of coking propensity in membrane-based dehydrogenation of hydrocarbons and alcohols

Huayang Zhu; Benjamin L. Kee; Canan Karakaya; Ryan O'Hayre; Robert J. Kee

doi:10.1016/j.cattod.2017.10.036

Equilibrium thermodynamic predictions of coking propensity in membrane-based dehydrogenation of hydrocarbons and alcohols

Huayang Zhu, Benjamin L. Kee, Canan Karakaya, Ryan O'Hayre, Robert J. Kee

Chemical Process Scale Up

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11 Scopus citations

Abstract

This paper uses equilibrium analysis to predict the likelihood of carbon deposits as functions of fuel-steam composition and temperature. The focus is particularly concerned with the effects of dehydrogenation as in catalytic membrane reactors or protonic fuel cells. Results show that if an inlet mixture is under the deposit limit, then even with significant hydrogen removal the dehydrogenated mixture can remain free of carbon deposits. Depending on operating temperature and pressure, the equilibrium predictions offer qualitative and quantitative guidelines that assist establishing initial fuel/steam ratios. The predictions also provide guidelines for assessing the effects of hydrogen removal via membranes. However, it must also be noted that there can be significant departures from equilibrium that are the result of finite-rate kinetic effects with particular catalysts.

Original language	English
Pages (from-to)	7-11
Number of pages	5
Journal	Catalysis Today
DOIs	https://doi.org/10.1016/j.cattod.2017.10.036
State	Published - Jul 1 2019

Funding

This research was supported partially by the Office of Naval Research via grant N00014-08-1-0539 and partially by the Advanced Research Projects Agency–Energy (ARPA-E) under the REBELS program via DE-AR0000493. We gratefully acknowledge insightful discussions with Prof. Robert Braun (CSM) on equilibriun thermodynamics, Dr. Anthony Manerbino (Solid State Energy Group) on ethanol reforming, and Prof. Olaf Deutschmann (Karlsruhe Institute of Technology) on dry reforming. This research was supported partially by the Office of Naval Research via grant N00014-08-1-0539 and partially by the Advanced Research Projects Agency?Energy (ARPA-E) under the REBELS program via DE-AR0000493. We gratefully acknowledge insightful discussions with Prof. Robert Braun (CSM) on equilibriun thermodynamics, Dr. Anthony Manerbino (Solid State Energy Group) on ethanol reforming, and Prof. Olaf Deutschmann (Karlsruhe Institute of Technology) on dry reforming.

Keywords

Carbon deposits
Catalytic dehydrogenation
Dry reforming
Equilibrium thermodynamics
Hydrogen membrane
Steam reforming

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10.1016/j.cattod.2017.10.036

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abstract = "This paper uses equilibrium analysis to predict the likelihood of carbon deposits as functions of fuel-steam composition and temperature. The focus is particularly concerned with the effects of dehydrogenation as in catalytic membrane reactors or protonic fuel cells. Results show that if an inlet mixture is under the deposit limit, then even with significant hydrogen removal the dehydrogenated mixture can remain free of carbon deposits. Depending on operating temperature and pressure, the equilibrium predictions offer qualitative and quantitative guidelines that assist establishing initial fuel/steam ratios. The predictions also provide guidelines for assessing the effects of hydrogen removal via membranes. However, it must also be noted that there can be significant departures from equilibrium that are the result of finite-rate kinetic effects with particular catalysts.",

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AU - Kee, Robert J.

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AB - This paper uses equilibrium analysis to predict the likelihood of carbon deposits as functions of fuel-steam composition and temperature. The focus is particularly concerned with the effects of dehydrogenation as in catalytic membrane reactors or protonic fuel cells. Results show that if an inlet mixture is under the deposit limit, then even with significant hydrogen removal the dehydrogenated mixture can remain free of carbon deposits. Depending on operating temperature and pressure, the equilibrium predictions offer qualitative and quantitative guidelines that assist establishing initial fuel/steam ratios. The predictions also provide guidelines for assessing the effects of hydrogen removal via membranes. However, it must also be noted that there can be significant departures from equilibrium that are the result of finite-rate kinetic effects with particular catalysts.

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Equilibrium thermodynamic predictions of coking propensity in membrane-based dehydrogenation of hydrocarbons and alcohols

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