Unexpected reactivity related to support effects during xylose hydrogenation over ruthenium catalysts

Vilcocq, Léa; Paez, Ana; Freitas, Victoria Dias da Silva; Veyre, Laurent; Fongarland, Pascal; Philippe, Régis

doi:10.1039/d1ra08193d

Cited by 11 publications

(9 citation statements)

References 55 publications

(83 reference statements)

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“…For deeper characterization of the ruthenium species on the surface of MCF, the H 2 chemisorption analyses were performed [ 31 , 32 ]. Based on these measurements, the ruthenium dispersion, particle size distribution and metal surface area were estimated.…”

Section: Resultsmentioning

confidence: 99%

Impact of Cerium Oxide on the State and Hydrogenation Activity of Ruthenium Species Incorporated on Mesocellular Foam Silica

2022

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Herein, the impact of cerium species loaded on mesoporous silica of MCF type on the state and catalytic activity of ruthenium species was studied. Up to 20 wt.% of cerium was incorporated on the silica surface, whereas the same 1 wt.% of Ru loading was applied. The samples prepared were examined by low temperature N2 adsorption/desorption, XRD, XRF, ICP-OES, XPS and H2 chemisorption. The catalytic activity of the materials obtained was investigated in the transformation of levulinic acid to γ-valerolactone. It was documented that the presence of Ce favored an increase in the dispersion of ruthenium species, which had a positive impact on the hydrogenation activity for up to 10 wt.% of Ce. Nevertheless, the highest cerium loading had a negative influence on the textural parameters of the support.

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Section: Resultsmentioning

confidence: 99%

Impact of Cerium Oxide on the State and Hydrogenation Activity of Ruthenium Species Incorporated on Mesocellular Foam Silica

2022

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“…Ru/TiO 2 catalyst was prepared by incipient wetness impregnation followed by calcination under N 2 and reduction under H 2 and characterised by several techniques (Table S1 in ESI). The preparation and characterisation of Ru/TiO 2 catalysts was detailed in another publication from our group [35] . Briefly, characterisation results show that the catalyst is composed of nanoparticles of Ru°, weakly dispersed on a TiO 2 rutile support with a very low surface area (non‐porous material).…”

Section: Resultsmentioning

confidence: 99%

“…The preparation and characterisation of Ru/TiO 2 catalysts was detailed in another publication from our group. [35] Briefly, characterisation results show that the catalyst is composed of nanoparticles of Ru°, weakly dispersed on a TiO 2 rutile support with a very low surface area (non-porous material). Our previous results have shown that despite of the low dispersion of ruthenium, this catalytic formulation is suitable for highly selective hydrogenation.…”

Section: Catalyst Preparation and Characterisationmentioning

confidence: 99%

Catalytic Hydrogenation of Hemicellulosic Sugars: Reaction Kinetics and Influence of Sugar Structure on Reaction Rate**

et al. 2023

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Hemicelluloses are a major component of lignocellulosic biomass. Different sugars can be obtained from hemicelluloses: xylose, arabinose, galactose, mannose, glucose. Their catalytic hydrogenation produces polyols: xylitol, arabinitol, dulcitol, mannitol, sorbitol, which are valuable chemicals and platform molecules. In this paper, the hydrogenation of sugars was investigated with a Ru/TiO 2 catalyst. The influence of temper-ature, pressure, xylose concentration and catalyst amount was studied for xylose hydrogenation and a Langmuir-Hinshelwood kinetic model was designed. The comparative study of five hemicellulose sugars showed a strong impact of sugar structure on hydrogenation rate: hexoses (glucose, mannose, galactose) react slower than pentoses (xylose, arabinose).

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“…The preparation and characterisation of Ru/TiO2 catalysts was detailed in another publication from our group. [35] Briefly, characterisation results show that the catalyst is composed of nanoparticles of Ru°, weakly dispersed on a TiO2 rutile support with a very low surface area (non-porous material). Our previous results have shown that despite of the low dispersion of ruthenium, this catalytic formulation is suitable for highly selective hydrogenation.…”

Section: Resultsmentioning

confidence: 99%

Catalytic hydrogenation of hemicellulosic sugars: reaction kinetics and influence of sugar structure on reaction rate

Freitas¹,

Paez²,

Fongarland³

et al. 2023

Preprint

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Hemicelluloses are a major part of lignocellulosic biomass. Different sugars can be obtained from hemicelluloses: xylose, arabinose, galactose, mannose, glucose. Their catalytic hydrogenation produces polyols: xylitol, arabinitol, dulcitol, mannitol, sorbitol, which are valuable chemicals and platform molecules. In this paper, the hydrogenation of sugars was investigated with a Ru/TiO2 catalyst. The influence of temperature, pressure, xylose concentration and catalyst amount was studied for xylose hydrogenation and a Langmuir-Hinshelwood kinetic model was designed. The comparative study of five hemicellulose sugars showed a strong impact of sugar structure on hydrogenation rate: hexoses (glucose, mannose, galactose) react slower than pentoses (xylose, arabinose).

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Unexpected reactivity related to support effects during xylose hydrogenation over ruthenium catalysts

Abstract: Xylose was hydrogenated over Ru on two different supports.

Cited by 11 publications

References 55 publications

Impact of Cerium Oxide on the State and Hydrogenation Activity of Ruthenium Species Incorporated on Mesocellular Foam Silica

Impact of Cerium Oxide on the State and Hydrogenation Activity of Ruthenium Species Incorporated on Mesocellular Foam Silica

Catalytic Hydrogenation of Hemicellulosic Sugars: Reaction Kinetics and Influence of Sugar Structure on Reaction Rate**

Catalytic hydrogenation of hemicellulosic sugars: reaction kinetics and influence of sugar structure on reaction rate

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