Hydrogenation of l-Arabinose and d-Galactose Mixtures Over a Heterogeneous Ru/C Catalyst

Herrera, Víctor A. Sifontes; Saleem, Farhan; Kusema, Bright T.; Eränen, Kari; Salmi, Tapio

doi:10.1007/s11244-012-9833-z

Cited by 23 publications

(20 citation statements)

References 12 publications

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“…Moreover, increasing temperature promotes the formation of by-products, as described in the previous section, leading to a reduced selectivity of the process and contamination of the catalyst. As already found during the batch experiments, and reported by Sifontes Herrera et al [11], temperatures above 120°C should be avoided.…”

Section: Reaction Temperaturesupporting

confidence: 63%

“…Due to the combined occurrence of arabinose and galactose in processing arabinogalactan, the behavior of the sugar mixture has attracted special attention. In contrast to the widely applied hydrogenation of glucose, kinetic data for the hydrogenation of arabinose and galactose is scarce . Some studies on the continuous hydrogenation of arabinose in a bench‐scale trickle‐bed reactor have also been performed, together with reactor modeling , .…”

Section: Introductionmentioning

confidence: 99%

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Continuous Hydrogenation of L‐Arabinose and D‐Galactose in a Mini Packed‐Bed Reactor

et al. 2017

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Dedicated to Professor Rüdiger Lange on the occasion of his 65th birthdayThe continuous hydrogenation of a mixture of L-arabinose and D-galactose over a Ru/C catalyst was investigated in a miniaturized packed-bed reactor. The reaction is one important step of the transformation of the naturally occurring hemicellulose arabinogalactan into valuable sugar alcohols. Process intensification was accomplished by reducing the reactor dimensions to a few millimeters; thus leading to better mass and heat transfer performance. The effects of temperature, pressure, and liquid flow rate on the yield and by-product formation are discussed. Based on a kinetic model derived from batch experiments, a model of the continuous reactor was developed and used for scale-up purposes.

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Section: Reaction Temperaturesupporting

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Continuous Hydrogenation of L‐Arabinose and D‐Galactose in a Mini Packed‐Bed Reactor

et al. 2017

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“…The low MW hemicelluloses extracted liquor was analysed by high performance liquid chomatography (HPLC, see below) for monosaccharide contents (glucose, xylose, mannose, galactose and arabinose). The carbohydrate composition was determined after a second acid post-hydrolysis of the liquor to depolymerize all remaining oligomers to monosaccharides using 37% HCl aqueous solution (pH 1) for 24 h at 90 • C in an autoclave, according to the protocol described in [79,80]. Table 2 shows the chemical compositions of the unhydrolyzed and post-hydrolyzed hemicelluloses liquor.…”

Section: Analysis Of Carbohydrates In Hemicellulose Extractmentioning

confidence: 99%

C-O Bond Hydrogenolysis of Aqueous Mixtures of Sugar Polyols and Sugars over ReOx-Rh/ZrO2 Catalyst: Application to an Hemicelluloses Extracted Liquor

et al. 2019

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The recovery and upgrade of hemicelluloses, a family of heteropolysaccharides in wood, is a key step to making lignocellulosic biomass conversion a cost-effective sustainable process in biorefinery. The comparative selective catalytic C-O bond hydrogenolysis of C5-C6 polyols, sugars, and their mixtures for the production of valuable C6 and C5 deoxygenated products was studied at 200 °C under 80 bar H2 over ReOx-Rh/ZrO2 catalysts. The sugars were rapidly converted to the polyols or converted into their hydrogenolysis products. Regardless of the reactants, C-O bond cleavage occurred significantly via multiple consecutive deoxygenation steps and led to the formation of linear deoxygenated C6 or C5 polyols. The distribution of products depended on the nature of the substrate and C-C bond scission was more important from monosaccharides. In addition, we demonstrated effective hydrogenolysis of a hemicellulose-extracted liquor from delignified maritime pine containing monosaccharides and low MW oligomers. Compared with the sugar-derived polyols, the mono- and oligosaccharides in the liquor were more rapidly converted to hexanediols or pentanediols. C-O bond scission was significant, giving a yield of desired deoxygenated products as high as 65%, higher than in the reaction of the synthetic mixture of glucose/xylose of the same C6/C5 sugar ratio (yield of 30%).

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“…The Ru/C catalyst was also effective for the hydrogenation of sugar mixtures. For instance, the high selectivity (>95%) of Ru/C was found in simultaneous hydrogenation of L‐arabinose and D‐galactose mixtures …”

Section: Lactitol Productionmentioning

confidence: 99%

Hydrogenation of lactose for the production of lactitol

Cheng

Martínez‐Monteagudo

2018

Asia-Pacific J Chem Eng

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Because of its chemical structure, low‐cost production, and large‐scale production, lactose is a promising source for the production of sugar alcohols. Lactitol is the primary sugar alcohol derived from lactose through a set of chemical reactions known as catalytic hydrogenation. Reaction products are strongly dependent on the reaction conditions and catalyst type. The purpose of this review is to examine the production of lactitol through hydrogenation of lactose. Technological aspects of hydrogenation of lactose are examined, including primary and secondary reaction products, type of catalyst used, catalyst deactivation and regeneration, kinetic models, selectivity, and reaction mechanisms. Research in this area is not as advanced as enzymatic catalysis, and there are opportunities for further studies in the fields of reaction optimization and detailed characterization of products.

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Hydrogenation of l-Arabinose and d-Galactose Mixtures Over a Heterogeneous Ru/C Catalyst

Cited by 23 publications

References 12 publications

Continuous Hydrogenation of L‐Arabinose and D‐Galactose in a Mini Packed‐Bed Reactor

Continuous Hydrogenation of L‐Arabinose and D‐Galactose in a Mini Packed‐Bed Reactor

C-O Bond Hydrogenolysis of Aqueous Mixtures of Sugar Polyols and Sugars over ReOx-Rh/ZrO2 Catalyst: Application to an Hemicelluloses Extracted Liquor

Hydrogenation of lactose for the production of lactitol

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