Strategies towards thermochemical valorisation of spent coffee grounds (SCG): Kinetic analysis of the thermal and thermo-oxidative decomposition

[EN] The thermochemical conversion of spent coffee grounds (SCG) under inert and oxidative atmospheres was comprehensively assessed as a feasible valorisation route for this biomass. Dynamic thermogravimetric analyses were performed at different heating rates. The individual contributions of the pse...

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Authors: Primaz, C., Gil-Castell, O., Ribes-Greus, A.|||0000-0003-2460-8291
Format: article
Publication Date:2023
Country:España
Institution:Universitat Politècnica de València (UPV)
Repository:RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia
Language:English
OAI Identifier:oai:riunet.upv.es:10251/207440
Online Access:https://riunet.upv.es/handle/10251/207440
Access Level:Open access
Keyword:Biomass
Spent coffee ground
Kinetic analysis
Pyrolysis
Combustion
MAQUINAS Y MOTORES TERMICOS
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spelling Strategies towards thermochemical valorisation of spent coffee grounds (SCG): Kinetic analysis of the thermal and thermo-oxidative decompositionPrimaz, C.Gil-Castell, O.Ribes-Greus, A.|||0000-0003-2460-8291BiomassSpent coffee groundKinetic analysisPyrolysisCombustionMAQUINAS Y MOTORES TERMICOS[EN] The thermochemical conversion of spent coffee grounds (SCG) under inert and oxidative atmospheres was comprehensively assessed as a feasible valorisation route for this biomass. Dynamic thermogravimetric analyses were performed at different heating rates. The individual contributions of the pseudo-components (hemicellulose, cellulose, and lignin) were determined by deconvolution using Lorentzian functions. For each pseudo-component, the kinetic triplet—apparent activation energy (Ea), pre-exponential factor (A), and reaction model (g(α))—was established by combining isoconversional methods, master-curve analysis, and the Pérez-Maqueda criterion. Under inert conditions, distinct mass-loss steps were identified corresponding to moisture release, decomposition of hemicellulose and cellulose and partial lignin degradation, followed by completion of lignin decomposition, leaving ~20% biochar. The Ea values were 217 kJ·mol⁻¹ (hemicellulose), 214 kJ·mol⁻¹ (cellulose), and 151 kJ·mol⁻¹ (lignin). Under oxidative conditions, similar stages were observed; however, the biochar was further oxidised, yielding only ash as residue (~2%). These results support the use of SCG as a solid biofuel, given its high LHV and HHV (≈20 MJ·kg⁻¹). The Ea values under oxidative conditions were 194 kJ·mol⁻¹ (hemicellulose), 147 kJ·mol⁻¹ (cellulose), and 173 kJ·mol⁻¹ (lignin). Similar decomposition behaviours were obtained regardless of atmosphere for hemicellulose (F4), cellulose (D3), and lignin (F2/4), suggesting that temperature, reactant concentration, particle morphology, and product diffusion govern SCG decomposition during non-isothermal pyrolytic and combustive thermochemical processes.The authors would like to thank the Chilean Economic Development Agency (CORFO) for the financial support through project 13CEI2-21839 and the contract for C.T. Primaz. Generalitat Valenciana is also acknowledged for the APOSTD/2020/155 grant for O. Gil-Castell.ElsevierDepartamento de Máquinas y Motores TérmicosEscuela Técnica Superior de Ingeniería Industrial Instituto Universitario de Investigación de Tecnología de los Materiales de la UPVGeneralitat ValencianaCORPORACION DE FOMENTO DE LA PRODUCCION, CORFORepositorio Institucional de la Universitat Politècnica de València Riunet20232023-07-01journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfapplication/pdfhttps://riunet.upv.es/handle/10251/207440reponame:RiuNet. Repositorio Institucional de la Universitat Politécnica de Valénciainstname:Universitat Politècnica de València (UPV)InglésengCorporación de Fomento de la Producción, Chile https://doi.org/10.13039/100009465 LEITAT. 13CEI2-21839 CENTRO DE EXCELENCIA EN NANOFIBRAS LEITAT CHILE (CEN LEITAT-CHILE)Generalitat Valenciana https://doi.org/10.13039/501100003359 APOSTD%2F2020%2F155open accesshttp://purl.org/coar/access_right/c_abf2Reconocimiento - No comercial - Sin obra derivada (by-nc-nd) http://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:riunet.upv.es:10251/2074402026-06-13T07:49:27Z
dc.title.none.fl_str_mv Strategies towards thermochemical valorisation of spent coffee grounds (SCG): Kinetic analysis of the thermal and thermo-oxidative decomposition
title Strategies towards thermochemical valorisation of spent coffee grounds (SCG): Kinetic analysis of the thermal and thermo-oxidative decomposition
spellingShingle Strategies towards thermochemical valorisation of spent coffee grounds (SCG): Kinetic analysis of the thermal and thermo-oxidative decomposition
Primaz, C.
Biomass
Spent coffee ground
Kinetic analysis
Pyrolysis
Combustion
MAQUINAS Y MOTORES TERMICOS
title_short Strategies towards thermochemical valorisation of spent coffee grounds (SCG): Kinetic analysis of the thermal and thermo-oxidative decomposition
title_full Strategies towards thermochemical valorisation of spent coffee grounds (SCG): Kinetic analysis of the thermal and thermo-oxidative decomposition
title_fullStr Strategies towards thermochemical valorisation of spent coffee grounds (SCG): Kinetic analysis of the thermal and thermo-oxidative decomposition
title_full_unstemmed Strategies towards thermochemical valorisation of spent coffee grounds (SCG): Kinetic analysis of the thermal and thermo-oxidative decomposition
title_sort Strategies towards thermochemical valorisation of spent coffee grounds (SCG): Kinetic analysis of the thermal and thermo-oxidative decomposition
dc.creator.none.fl_str_mv Primaz, C.
Gil-Castell, O.
Ribes-Greus, A.|||0000-0003-2460-8291
author Primaz, C.
author_facet Primaz, C.
Gil-Castell, O.
Ribes-Greus, A.|||0000-0003-2460-8291
author_role author
author2 Gil-Castell, O.
Ribes-Greus, A.|||0000-0003-2460-8291
author2_role author
author
dc.contributor.none.fl_str_mv Departamento de Máquinas y Motores Térmicos
Escuela Técnica Superior de Ingeniería Industrial
 Instituto Universitario de Investigación de Tecnología de los Materiales de la UPV
Generalitat Valenciana
CORPORACION DE FOMENTO DE LA PRODUCCION, CORFO
Repositorio Institucional de la Universitat Politècnica de València Riunet
dc.subject.none.fl_str_mv Biomass
Spent coffee ground
Kinetic analysis
Pyrolysis
Combustion
MAQUINAS Y MOTORES TERMICOS
topic Biomass
Spent coffee ground
Kinetic analysis
Pyrolysis
Combustion
MAQUINAS Y MOTORES TERMICOS
description [EN] The thermochemical conversion of spent coffee grounds (SCG) under inert and oxidative atmospheres was comprehensively assessed as a feasible valorisation route for this biomass. Dynamic thermogravimetric analyses were performed at different heating rates. The individual contributions of the pseudo-components (hemicellulose, cellulose, and lignin) were determined by deconvolution using Lorentzian functions. For each pseudo-component, the kinetic triplet—apparent activation energy (Ea), pre-exponential factor (A), and reaction model (g(α))—was established by combining isoconversional methods, master-curve analysis, and the Pérez-Maqueda criterion. Under inert conditions, distinct mass-loss steps were identified corresponding to moisture release, decomposition of hemicellulose and cellulose and partial lignin degradation, followed by completion of lignin decomposition, leaving ~20% biochar. The Ea values were 217 kJ·mol⁻¹ (hemicellulose), 214 kJ·mol⁻¹ (cellulose), and 151 kJ·mol⁻¹ (lignin). Under oxidative conditions, similar stages were observed; however, the biochar was further oxidised, yielding only ash as residue (~2%). These results support the use of SCG as a solid biofuel, given its high LHV and HHV (≈20 MJ·kg⁻¹). The Ea values under oxidative conditions were 194 kJ·mol⁻¹ (hemicellulose), 147 kJ·mol⁻¹ (cellulose), and 173 kJ·mol⁻¹ (lignin). Similar decomposition behaviours were obtained regardless of atmosphere for hemicellulose (F4), cellulose (D3), and lignin (F2/4), suggesting that temperature, reactant concentration, particle morphology, and product diffusion govern SCG decomposition during non-isothermal pyrolytic and combustive thermochemical processes.
publishDate 2023
dc.date.none.fl_str_mv 2023
2023-07-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://riunet.upv.es/handle/10251/207440
url https://riunet.upv.es/handle/10251/207440
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.relation.none.fl_str_mv Corporación de Fomento de la Producción, Chile https://doi.org/10.13039/100009465 LEITAT. 13CEI2-21839 CENTRO DE EXCELENCIA EN NANOFIBRAS LEITAT CHILE (CEN LEITAT-CHILE)
Generalitat Valenciana https://doi.org/10.13039/501100003359 APOSTD%2F2020%2F155
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Reconocimiento - No comercial - Sin obra derivada (by-nc-nd)
http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Reconocimiento - No comercial - Sin obra derivada (by-nc-nd)
http://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia
instname:Universitat Politècnica de València (UPV)
instname_str Universitat Politècnica de València (UPV)
reponame_str RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia
collection RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,812455

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