Selective hydrolysis of wheat straw hemicellulose using high-pressure CO2 as catalyst
Autor(a) principal: | |
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Data de Publicação: | 2015 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.9/2882 |
Resumo: | The processing of wheat straw using high-pressure CO2–H2O technology was studied with the objective to evaluate the effect of CO2 as catalyst on the hydrothermal production of hemicellulose-derived sugars either as oligomers or as monomers. Also, the reduction of the crystallinity of the cellulose-rich fraction was assessed. Over a range of reaction conditions (0 to 50 bar of initial CO2 pressure and 0 to 45 minutes of holding time, at T ¼ 180 C), the addition of CO2 to water-based processes led to the in situ formation of carbonic acid, which allowed us to obtain a higher dissolution of wheat straw hemicellulose. Furthermore, this approach led to a xylo-oligosaccharide (XOS) rich fraction, yielding 79.6 g of XOS per 100 g of the initial xylan content (at 50 bar of initial CO2 pressure and 12 min of residence time) while the water-only process gave only 70.8 g of XOS per 100 g of initial xylan content. Furthermore, for higher pressures of CO2, a decrease in oligosaccharide content was found and was counterbalanced by production of monomer sugars, achieving a maximum of 5.7 g L1 at the severest condition. |
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Selective hydrolysis of wheat straw hemicellulose using high-pressure CO2 as catalyst HydrolysisLignocellulosic residuesHemicelluloseWheat StrawThe processing of wheat straw using high-pressure CO2–H2O technology was studied with the objective to evaluate the effect of CO2 as catalyst on the hydrothermal production of hemicellulose-derived sugars either as oligomers or as monomers. Also, the reduction of the crystallinity of the cellulose-rich fraction was assessed. Over a range of reaction conditions (0 to 50 bar of initial CO2 pressure and 0 to 45 minutes of holding time, at T ¼ 180 C), the addition of CO2 to water-based processes led to the in situ formation of carbonic acid, which allowed us to obtain a higher dissolution of wheat straw hemicellulose. Furthermore, this approach led to a xylo-oligosaccharide (XOS) rich fraction, yielding 79.6 g of XOS per 100 g of the initial xylan content (at 50 bar of initial CO2 pressure and 12 min of residence time) while the water-only process gave only 70.8 g of XOS per 100 g of initial xylan content. Furthermore, for higher pressures of CO2, a decrease in oligosaccharide content was found and was counterbalanced by production of monomer sugars, achieving a maximum of 5.7 g L1 at the severest condition.The Royal Society of ChemistryRepositório do LNEGRelvas, F.Morais, Ana Rita C.Lukasik, Rafal M.2016-03-14T16:52:22Z20152015-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.9/2882engRelvas, F.; Morais, A.R.; Bogel-Lukasik, R. - Selective hydrolysis of wheat straw hemicellulose using high-pressure CO2 as catalyst. In: RSC Advances, 2015, Vol. 5, p. 73935-739442046-206910.1039/c5ra14632ainfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2022-12-11T04:55:16Zoai:repositorio.lneg.pt:10400.9/2882Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T15:35:55.485521Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Selective hydrolysis of wheat straw hemicellulose using high-pressure CO2 as catalyst |
title |
Selective hydrolysis of wheat straw hemicellulose using high-pressure CO2 as catalyst |
spellingShingle |
Selective hydrolysis of wheat straw hemicellulose using high-pressure CO2 as catalyst Relvas, F. Hydrolysis Lignocellulosic residues Hemicellulose Wheat Straw |
title_short |
Selective hydrolysis of wheat straw hemicellulose using high-pressure CO2 as catalyst |
title_full |
Selective hydrolysis of wheat straw hemicellulose using high-pressure CO2 as catalyst |
title_fullStr |
Selective hydrolysis of wheat straw hemicellulose using high-pressure CO2 as catalyst |
title_full_unstemmed |
Selective hydrolysis of wheat straw hemicellulose using high-pressure CO2 as catalyst |
title_sort |
Selective hydrolysis of wheat straw hemicellulose using high-pressure CO2 as catalyst |
author |
Relvas, F. |
author_facet |
Relvas, F. Morais, Ana Rita C. Lukasik, Rafal M. |
author_role |
author |
author2 |
Morais, Ana Rita C. Lukasik, Rafal M. |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
Repositório do LNEG |
dc.contributor.author.fl_str_mv |
Relvas, F. Morais, Ana Rita C. Lukasik, Rafal M. |
dc.subject.por.fl_str_mv |
Hydrolysis Lignocellulosic residues Hemicellulose Wheat Straw |
topic |
Hydrolysis Lignocellulosic residues Hemicellulose Wheat Straw |
description |
The processing of wheat straw using high-pressure CO2–H2O technology was studied with the objective to evaluate the effect of CO2 as catalyst on the hydrothermal production of hemicellulose-derived sugars either as oligomers or as monomers. Also, the reduction of the crystallinity of the cellulose-rich fraction was assessed. Over a range of reaction conditions (0 to 50 bar of initial CO2 pressure and 0 to 45 minutes of holding time, at T ¼ 180 C), the addition of CO2 to water-based processes led to the in situ formation of carbonic acid, which allowed us to obtain a higher dissolution of wheat straw hemicellulose. Furthermore, this approach led to a xylo-oligosaccharide (XOS) rich fraction, yielding 79.6 g of XOS per 100 g of the initial xylan content (at 50 bar of initial CO2 pressure and 12 min of residence time) while the water-only process gave only 70.8 g of XOS per 100 g of initial xylan content. Furthermore, for higher pressures of CO2, a decrease in oligosaccharide content was found and was counterbalanced by production of monomer sugars, achieving a maximum of 5.7 g L1 at the severest condition. |
publishDate |
2015 |
dc.date.none.fl_str_mv |
2015 2015-01-01T00:00:00Z 2016-03-14T16:52:22Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10400.9/2882 |
url |
http://hdl.handle.net/10400.9/2882 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Relvas, F.; Morais, A.R.; Bogel-Lukasik, R. - Selective hydrolysis of wheat straw hemicellulose using high-pressure CO2 as catalyst. In: RSC Advances, 2015, Vol. 5, p. 73935-73944 2046-2069 10.1039/c5ra14632a |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
The Royal Society of Chemistry |
publisher.none.fl_str_mv |
The Royal Society of Chemistry |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
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1799130225176477696 |