Electrochemical production of syngas from CO2 at pressures up to 30 bar in electrolytes containing ionic liquid

Messias, Sofia; Sousa, Miguel M.; Ponte, Manuel Nunes; Rangel, C. M.; Pardal, T.; Machado, Ana

Publication

Electrochemical production of syngas from CO2 at pressures up to 30 bar in electrolytes containing ionic liquid

2019Journal article

dc.contributor.author	Messias, Sofia
dc.contributor.author	Sousa, Miguel M.
dc.contributor.author	Ponte, Manuel Nunes
dc.contributor.author	Rangel, C. M.
dc.contributor.author	Pardal, T.
dc.contributor.author	Machado, Ana
dc.date.accessioned	2020-03-25T09:07:09Z
dc.date.available	2020-03-25T09:07:09Z
dc.date.issued	2019
dc.description.abstract	ABSTRACT: Electrochemical CO2 reduction in a reactor that can operate up to 100 bar and 80 degrees C, with a configuration similar to that of an alkaline electrolyser, for hydrogen production suitable to be used industrially is reported for the first time. The effect of pressure on the co-electrolysis of CO2 and water was studied. The successful scale-up from a previously reported batch process to electrodes of ca. 30 cm(2) geometrical area (30-fold factor) that combines the use of pressure and an ionic liquid-based electrolyte is presented. Also for the first time, the potential of the system under study to achieve high conversions of CO2 to avoid a purification step of syngas from unreacted CO2 is shown. An inexpensive commercial foil of the common metal zinc was employed. A semi-continuous operation yielded syngas productivities in the range of 0.02-0.04 mmol cm(-2) h(-1) at ca. -1.2 V vs. QRE Ag/Ag+. When an electrolyte consisting of 90 wt% H2O and 10 wt% 1-ethyl-3-methylimidazolium trifluoromethanesulfonate was used, selectivities for CO in the range of 62% to 72% were obtained at 10 bar pressure, whereas selectivities of 82% were obtained at 30 bar pressure. H-2/CO ratios in the range of 1/1 to 4/1 at 10 bar pressure suitable for the synthesis of a variety of fuels, such as hydrocarbons, methanol, methane and chemical building blocks, were observed. An energy efficiency of 44.6% was calculated for a H-2/CO ratio of 2.2 suitable for the synthesis of methanol.	pt_PT
dc.description.version	info:eu-repo/semantics/publishedVersion	pt_PT
dc.identifier.citation	Messias, Sofia ... [et.al.] - Electrochemical production of syngas from CO2 at pressures up to 30 bar in electrolytes containing ionic liquid. In: Reaction Chemistry & Engineering, 2019, Vol. 4, p. 1982-1990	pt_PT
dc.identifier.doi	10.1039/c9re00271e	pt_PT
dc.identifier.issn	2058-9883
dc.identifier.uri	http://hdl.handle.net/10400.9/3200
dc.language.iso	eng	pt_PT
dc.peerreviewed	yes	pt_PT
dc.publisher	Royal Society of Chemistry	pt_PT
dc.relation	POCI-01-0145-FEDER-016387	pt_PT
dc.relation.publisherversion	https://doi.org/10.1039/c9re00271e	pt_PT
dc.rights.uri	http://creativecommons.org/licenses/by/4.0/	pt_PT
dc.subject	Carbon dioxide	pt_PT
dc.subject	Electrochemical reduction	pt_PT
dc.subject	Energy conversion	pt_PT
dc.subject	Ionic liquids	pt_PT
dc.subject	Electrolytes	pt_PT
dc.title	Electrochemical production of syngas from CO2 at pressures up to 30 bar in electrolytes containing ionic liquid	pt_PT
dc.type	journal article
dspace.entity.type	Publication
oaire.citation.endPage	1990	pt_PT
oaire.citation.startPage	1982	pt_PT
oaire.citation.title	Reaction Chemistry and Engineering	pt_PT
oaire.citation.volume	4	pt_PT
person.familyName	Rangel
person.familyName	Machado
person.givenName	Carmen M.
person.givenName	Ana
person.identifier	1702931
person.identifier.ciencia-id	AA13-FF7C-9E29
person.identifier.ciencia-id	7E1F-6E0F-F3B6
person.identifier.orcid	0000-0001-7996-8142
person.identifier.orcid	0000-0002-7432-8725
person.identifier.rid	D-5477-2011
person.identifier.scopus-author-id	7006108156
rcaap.rights	openAccess	pt_PT
rcaap.type	article	pt_PT
relation.isAuthorOfPublication	804e595a-d539-46a2-ae78-6cadc8ca9457
relation.isAuthorOfPublication	c37d4a90-59f0-4d44-bee9-9f022529e003
relation.isAuthorOfPublication.latestForDiscovery	804e595a-d539-46a2-ae78-6cadc8ca9457