Selective hydrolysis of wheat straw hemicellulose using high-pressure CO2 as catalyst
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-r...
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Online Access: | http://hdl.handle.net/10400.9/2882 https://doi.org/10.1039/c5ra14632a |
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ftlneg:oai:repositorio.lneg.pt:10400.9/2882 2023-05-15T15:52:44+02:00 Selective hydrolysis of wheat straw hemicellulose using high-pressure CO2 as catalyst Relvas, F. Morais, Ana Rita C. Lukasik, Rafal M. 2016-03-14T16:52:22Z http://hdl.handle.net/10400.9/2882 https://doi.org/10.1039/c5ra14632a eng eng The Royal Society of Chemistry http://dx.doi.org/10.1039/c5ra14632a 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 http://hdl.handle.net/10400.9/2882 doi:10.1039/c5ra14632a openAccess Hydrolysis Lignocellulosic residues Hemicellulose Wheat Straw article 2016 ftlneg https://doi.org/10.1039/c5ra14632a 2022-12-07T01:06:14Z 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. Article in Journal/Newspaper Carbonic acid Laboratório Nacional de Energia e Geologia: Repositório Científico do LNEG RSC Advances 5 90 73935 73944 |
institution |
Open Polar |
collection |
Laboratório Nacional de Energia e Geologia: Repositório Científico do LNEG |
op_collection_id |
ftlneg |
language |
English |
topic |
Hydrolysis Lignocellulosic residues Hemicellulose Wheat Straw |
spellingShingle |
Hydrolysis Lignocellulosic residues Hemicellulose Wheat Straw Relvas, F. Morais, Ana Rita C. Lukasik, Rafal M. Selective hydrolysis of wheat straw hemicellulose using high-pressure CO2 as catalyst |
topic_facet |
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. |
format |
Article in Journal/Newspaper |
author |
Relvas, F. Morais, Ana Rita C. Lukasik, Rafal M. |
author_facet |
Relvas, F. Morais, Ana Rita C. Lukasik, Rafal M. |
author_sort |
Relvas, F. |
title |
Selective hydrolysis of wheat straw hemicellulose using high-pressure CO2 as catalyst |
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 |
publisher |
The Royal Society of Chemistry |
publishDate |
2016 |
url |
http://hdl.handle.net/10400.9/2882 https://doi.org/10.1039/c5ra14632a |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_relation |
http://dx.doi.org/10.1039/c5ra14632a 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 http://hdl.handle.net/10400.9/2882 doi:10.1039/c5ra14632a |
op_rights |
openAccess |
op_doi |
https://doi.org/10.1039/c5ra14632a |
container_title |
RSC Advances |
container_volume |
5 |
container_issue |
90 |
container_start_page |
73935 |
op_container_end_page |
73944 |
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1766387843185246208 |