Structure Sensitivity in Catalytic Hydrogenation of Galactose and Arabinose over Ru/C Catalysts

Simakova, Irina L.; Demidova, Yulia; Murzina, Elena V.; Aho, Atte; Murzin, Dmitry Yu.

doi:10.1007/s10562-016-1752-3

Cited by 21 publications

(24 citation statements)

References 25 publications

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“…Colloidal Ru NPs were synthesized by the polyol method in EG using PVP as a capping agent similar to the method presented in [13][14][15][16]. This method was shown to provide formation of highly concentrated solutions of colloidal Ru NPs with a relatively low amount of the capping agent (Ru/PVP 1/5) demonstrating good stability at least during 24 months.…”

Section: Characterization Of Ru/sibunit and Ru(nps)/sibunitmentioning

confidence: 99%

“…It was shown that a highly concentrated colloidal solution of well-defined Ru NPs (0.1 M) can be obtained by the polyol method using polyvinylpyrrolidone (PVP) as a stabilizing agent under a minor PVP excess (mol Ru/mol PVP monomer 1/5) [13]. High activity of colloidal catalysts was demonstrated in hydrogenation of galactose and arabinose into corresponding commercially valuable sugar alcohols [14,15].…”

Section: Introductionmentioning

confidence: 99%

“…Reaction conditions levulinic acid 0.7 ml, 1,4-dioxane 15 ml, catalyst 240 mg, T=165°C, 20 bar Н Journal of Siberian Federal University. Chemistry 2020 13(1):[5][6][7][8][9][10][11][12][13][14][15][16]…”

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confidence: 99%

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Carbon Supported Size-Controlled Ru Catalysts for Selective Levulinic Acid Hydrogenation into γ-Valerolactone

Irina

Yuliya

Mikhail

et al. 2020

Journal of Siberian Federal University. Chemistry

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Liquid phase levulinic acid hydrogenation into γ-valerolactone in 1,4-dioxane as a solvent (165°C, 20 bar) was studied over a range of Ru monometallic catalysts using mesoporous carbon material Sibunit as a support. In addition to the catalyst prepared by impregnation with RuCl3∙nH2O (0.1 M) followed by reduction in H2, size-controlled Ru(NPs)/Sibunit catalysts were synthesized by immobilization of polyvinylpyrrolidone (PVP) stabilized Ru nanoparticles (NPs) (dRu=2.4 nm). Сarbon supported colloidal Ru NPs were not studied earlier in levulinic acid hydrogenation. Activity of colloidal Ru(NPs)/Sibunit catalysts was found to be lower than that of impregnated Ru/Sibunit which could be attributed to hampering effect of PVP. However, colloidal Ru(NPs)/Sibunit purified by thermal treatment in air (180°C) followed by reduction in H2 (400°C) exhibited the same activity as impregnated one yielding 93% γ-valerolactone at 100% levulinic acid conversion. Applicability of supported PVP-assisted colloidal Ru NPs in hydrogenation of levulinic acid illustrates a potential to prepare more efficient catalysts for this reaction with a desired particle size. The catalysts were characterized by TEM, XRF, and N2 physisorption to compare their physical chemical properties

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Section: Characterization Of Ru/sibunit and Ru(nps)/sibunitmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Carbon Supported Size-Controlled Ru Catalysts for Selective Levulinic Acid Hydrogenation into γ-Valerolactone

Irina

Yuliya

Mikhail

et al. 2020

Journal of Siberian Federal University. Chemistry

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“…First, we evaluated the activity of the Ru/H-ZSM-5 catalyst in the hydrogenation of sugar model mixtures into sugar alcohols. Ruthenium catalysts were chosen as they have demonstrated to be very active for hydrogenation of sugars in numerous works (Barbaro et al, 2016;Faba et al, 2014;Irmak et al, 2017;Murzin et al, 2015aMurzin et al, , 2015bPham et al, 2016;Ribeiro et al, , 2017aRibeiro et al, , 2017bSimakova et al, 2016;. The experiments involved xylose and arabinose, as major components of the purified hydrolysate, but also glucose, as it is present after the purification.…”

Section: Hydrogenation Of Sugar Model Mixturesmentioning

confidence: 99%

“…The conversion of model hemicellulosic compounds, i.e. C5 sugars (Barbaro et al, 2016;Morales et al, 2016Morales et al, , 2017Pham et al, 2016;Simakova et al, 2016; and commercial oligosaccharides Faba et al, 2014;Liu et al, 2016;Murzin et al, 2015aMurzin et al, , 2015bRibeiro et al, , 2017aRibeiro et al, , 2017b into sugar alcohols has been widely studied for many years.…”

Section: Introductionmentioning

confidence: 99%

Wheat bran biorefinery: Valorization of hemicelluloses to sugar alcohols. Fractionation - Hydrolysis - Purification - Hydrogenation

Bastardo¹

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This is related to the type of bond existing between arabinose (linked by α-glycosidic bonds, weak) and xylose (linked by β-glycosidic bonds, strong) molecules. The easier access to the side chains (composed of arabinose) than to the backbone (composed of xylose) also explains the faster release of arabinose than xylose. Prior to the hydrogenation of sugars from wheat bran, a kinetic study with sugar model mixtures was carried out in Chapter 4 using ruthenium catalysts supported on H-ZSM-5 ABSTRACT 6 zeolites with different SiO2/Al2O3 ratio (23 and 80). Reaction temperature was varied from 80 to 120 ºC and time between 5 and 30 minutes. Likewise, the influence of catalyst loading was analyzed in the range 0-0.060 g Ru•g C-1. The acidity of the support (SiO2/Al2O3 ratio) played a crucial role in the reaction mechanism. Ru/H-ZSM-5 (80) resulted in higher conversion and selectivity than Ru/H-ZSM-5 (23), since low acidic supports promoted hydrogenation over secondary reaction pathways, such as isomerization. Experimental results showed that C5 sugars were faster hydrogenated than C6 sugars. Indeed, the optimum temperature for arabinose and xylose hydrogenation was 100 ºC, whereas 120 ºC was the most suitable temperature for glucose hydrogenation. In this sense, operating conditions could be tuned to maximize the yield of pentitols and/or hexitols. Additionally, experimental data was successfully reproduced by a pseudo-first order kinetic model with relatively low absolute deviations (< 11%) and high regression coefficients (> 0.950). The activation energy values were 47.9 kJ•mol-1 , 43.7 kJ•mol-1 and 92.0 kJ•mol-1 for the hydrogenation of arabinose, xylose and glucose, respectively, using Ru/H-ZSM-5 (80) as catalyst. In Chapter 5, the purification of wheat bran hydrolysates and the subsequent catalytic production of sugar alcohols was investigated. This hydrolysate was composed of xylose (5.6 g•L-1), arabinose (2.8 g•L-1), glucose (0.8 g•L-1), furfural (0.3 g•L-1), proteins (0.9 g•L-1), different inorganic elements (Mg, Ca, K, S) and some lignin derivatives. A purification strategy was defined to maximize the sugar content in this hydrolysate. The process was based on the selective recovery of sugars by anionic extraction with a boronic acid (hydroxymethyl phenylboronic acid) which was dissolved in an organic phase composed by a quaternary ammonium salt (Aliquat ® 336) and 1-octanol. The sugars were then back-extracted in an acidic solution which was further purified by means of ion exchange resins (Amberlyst ® 15 and Amberlite ® IRA-96). After this process, an aqueous ABSTRACT 7 phase with a purity in sugars of 90% (based on carbon balance) was obtained. It was free of inorganic salts and proteins and it had a lower content of sugar degradation products and lignin derivatives than the initial hydrolysate. Importantly, the organic phase was successfully recycled. Purified sugars were then hydrogenated over Ru/H-ZSM-5 (80). A high pentitols yield of ~70% with 100% selectivity was achieved at 100 ºC after 10 minutes wi...

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Catalytic Upgrading of Holocellulose‐Derived C ₅ and C ₆ Sugars

Zhang

Tai

Osatiashtiani

et al. 2019

Chemical Catalysts for Biomass Upgrading

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Structure Sensitivity in Catalytic Hydrogenation of Galactose and Arabinose over Ru/C Catalysts

Cited by 21 publications

References 25 publications

Carbon Supported Size-Controlled Ru Catalysts for Selective Levulinic Acid Hydrogenation into γ-Valerolactone

Carbon Supported Size-Controlled Ru Catalysts for Selective Levulinic Acid Hydrogenation into γ-Valerolactone

Wheat bran biorefinery: Valorization of hemicelluloses to sugar alcohols. Fractionation - Hydrolysis - Purification - Hydrogenation

Catalytic Upgrading of Holocellulose‐Derived C ₅ and C ₆ Sugars

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Structure Sensitivity in Catalytic Hydrogenation of Galactose and Arabinose over Ru/C Catalysts

Cited by 21 publications

References 25 publications

Carbon Supported Size-Controlled Ru Catalysts for Selective Levulinic Acid Hydrogenation into γ-Valerolactone

Carbon Supported Size-Controlled Ru Catalysts for Selective Levulinic Acid Hydrogenation into γ-Valerolactone

Wheat bran biorefinery: Valorization of hemicelluloses to sugar alcohols. Fractionation - Hydrolysis - Purification - Hydrogenation

Catalytic Upgrading of Holocellulose‐Derived C 5 and C 6 Sugars

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Catalytic Upgrading of Holocellulose‐Derived C ₅ and C ₆ Sugars