Influence of the Water Phase State on the Thermodynamics of Aqueous Phase Reforming for Hydrogen Production

Renée M. Ripken, Jan Meuldijk, Johannes G.E. Gardeniers, Severine le Gac

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Abstract

Hydrogen is a promising renewable energy source that can be produced from biomass using aqueous-phase reforming (APR). Here, using data obtained from AspenPlus and the literature, we evaluated the phase state, temperature-dependent enthalpy, and Gibbs free energy for the APR of small biomass model substrates. Phase equilibrium studies reveal that, under typical APR reaction conditions, the reaction mixture is in the liquid phase. Therefore, we show for the first time that the water-gas shift reaction (WGSR), which is the second main reaction of APR, must be modeled in the liquid phase, resulting in an endothermic instead of an exothermic enthalpy of reaction. A significant implication of this finding is that, although APR has been introduced as more energy saving than conventional reforming methods, the WGSR in APR has a comparable energy demand to the WGSR in steam reforming (SR).
Original languageEnglish
Pages (from-to)4909-4913
JournalChemSusChem
Volume10
Issue number24
DOIs
Publication statusPublished - 2017

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Reforming reactions
Hydrogen production
thermodynamics
Thermodynamics
hydrogen
enthalpy
Water
Water gas shift
gas
liquid
Gibbs free energy
biomass
phase equilibrium
water
Enthalpy
Biomass
substrate
Steam reforming
Liquids
Phase equilibria

Cite this

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title = "Influence of the Water Phase State on the Thermodynamics of Aqueous Phase Reforming for Hydrogen Production",
abstract = "Hydrogen is a promising renewable energy source that can be produced from biomass using aqueous-phase reforming (APR). Here, using data obtained from AspenPlus and the literature, we evaluated the phase state, temperature-dependent enthalpy, and Gibbs free energy for the APR of small biomass model substrates. Phase equilibrium studies reveal that, under typical APR reaction conditions, the reaction mixture is in the liquid phase. Therefore, we show for the first time that the water-gas shift reaction (WGSR), which is the second main reaction of APR, must be modeled in the liquid phase, resulting in an endothermic instead of an exothermic enthalpy of reaction. A significant implication of this finding is that, although APR has been introduced as more energy saving than conventional reforming methods, the WGSR in APR has a comparable energy demand to the WGSR in steam reforming (SR).",
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Influence of the Water Phase State on the Thermodynamics of Aqueous Phase Reforming for Hydrogen Production. / Ripken, Renée M.; Meuldijk, Jan; Gardeniers, Johannes G.E.; le Gac, Severine .

In: ChemSusChem, Vol. 10, No. 24, 2017, p. 4909-4913.

Research output: Contribution to journalArticleAcademicpeer-review

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T1 - Influence of the Water Phase State on the Thermodynamics of Aqueous Phase Reforming for Hydrogen Production

AU - Ripken, Renée M.

AU - Meuldijk, Jan

AU - Gardeniers, Johannes G.E.

AU - le Gac, Severine

PY - 2017

Y1 - 2017

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AB - Hydrogen is a promising renewable energy source that can be produced from biomass using aqueous-phase reforming (APR). Here, using data obtained from AspenPlus and the literature, we evaluated the phase state, temperature-dependent enthalpy, and Gibbs free energy for the APR of small biomass model substrates. Phase equilibrium studies reveal that, under typical APR reaction conditions, the reaction mixture is in the liquid phase. Therefore, we show for the first time that the water-gas shift reaction (WGSR), which is the second main reaction of APR, must be modeled in the liquid phase, resulting in an endothermic instead of an exothermic enthalpy of reaction. A significant implication of this finding is that, although APR has been introduced as more energy saving than conventional reforming methods, the WGSR in APR has a comparable energy demand to the WGSR in steam reforming (SR).

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