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Towards autothermal hydrogen production by sorption-enhanced water gas shift and methanol reforming: a thermodynamic analysis

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Title: Towards autothermal hydrogen production by sorption-enhanced water gas shift and methanol reforming: a thermodynamic analysis
Authors: Iruretagoyena Ferrer, D
Hellgardt, K
Chadwick, D
Item Type: Journal Article
Abstract: Hydrogen production by the water gas shift reaction (WGS) is equilibrium limited. In the current study, we demonstrate that the overall efficiency of the WGS can be improved by co-feeding methanol and removing CO2 in situ. The thermodynamics of the water gas shift and methanol reforming/WGS (methanol-to-shift, MtoS) reactions for H2 production alone and with simultaneous CO2 adsorption (sorption-enhanced, SEWGS and SEMtoS) were studied using a non-stoichiometric approach based on the minimisation of the Gibbs free energy. A typical composition of the effluent from a steam methane reformer was used for the shift section. The effects of temperature (450–750 K), pressure (5–30 barg), steam and methanol addition, fraction of CO2 adsorption (0–95%) and energy efficiency of the shift systems have been investigated. Adding methanol to the feed facilitates autothermal operation of the shift unit, with and without CO2 removal, and enhances significantly the amount of H2 produced. For a set methanol and CO input, the MtoS and SEMtoS systems show a maximum productivity of H2 between 523 and 593 K due to the increasing limitation of the exothermic shift reaction while the endothermic methanol steam reforming is no longer limited above 593 K. The heat of adsorption of CO2 was found to make only a small difference to the H2 production or the autothermal conditions.
Issue Date: 1-Mar-2018
Date of Acceptance: 8-Jan-2018
URI: http://hdl.handle.net/10044/1/56948
DOI: https://dx.doi.org/10.1016/j.ijhydene.2018.01.043
ISSN: 0360-3199
Publisher: Elsevier
Start Page: 4211
End Page: 4222
Journal / Book Title: International Journal of Hydrogen Energy
Volume: 43
Issue: 9
Copyright Statement: © 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (E
Funder's Grant Number: EP/K014749/1
CCR10900 - IRIS 130635/54
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Electrochemistry
Energy & Fuels
Chemistry
Hydrogen
Water gas shift reaction
Methanol steam reforming
Sorption-enhancement
CO2 adsorption
Thermodynamic analysis
LAYERED DOUBLE OXIDES
PACKED-BED REACTOR
CARBON-DIOXIDE
MEMBRANE REACTOR
GRAPHENE OXIDE
CO2 ADSORPTION
H-2 PRODUCTION
STEAM
CAPTURE
OIL
09 Engineering
03 Chemical Sciences
Energy
Publication Status: Published
Online Publication Date: 2018-02-09
Appears in Collections:Chemical Engineering
Faculty of Engineering