Hydrogenolysis of sorbitol to glycols over carbon nanofiber supported ruthenium catalyst

Zhao, Liang; Zhou, Jinghong; Sui, Zhi‐Jun; Zhou, Xin

doi:10.1016/j.ces.2009.03.026

Cited by 110 publications

(71 citation statements)

References 21 publications

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“…As a result, the product distribution was dramatically changed with 1,2-PG selectivity overwhelming that of EG (30.7 % vs. 16.6 %) in the presence of an optimal catalyst (50 %WO 3 /Al 2 O 3 + C act ) [26]. In addition, and quite different from many previous studies in which hexitols were used as feedstock or reaction intermediates for the hydrogenolysis to form 1,2-PG and EG [55,[126][127][128][129][130][131][132][133], hexitols formation is competing with the glucose degradation in the DLEG process. The hexitols formed are found to be stable under the reaction conditions and cannot be further converted into EG and 1,2-PG [17,115].…”

Section: Catalysts and Reaction Mechanismmentioning

confidence: 63%

“…The reaction mechanism mainly involves hydrolytic hydrogenation of cellulose to hexitols and the subsequent hydrogenolysis of hexitols to 1,2-PG and EG. As shown in many other extensive studies, the basic sites and metallic dehydrogenation and hydrogenation sites play synergistic roles in polyol conversion to 1,2-PG and EG [55,[126][127][128][129][130][131][132][133].…”

Section: Catalysts and Reaction Mechanismmentioning

confidence: 99%

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Mechanism and Kinetic Analysis of the Hydrogenolysis of Cellulose to Polyols

Wang

Pang

et al. 2016

Green Chemistry and Sustainable Technology

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The catalytic hydrogenolysis of cellulose to polyols represents an attractive process for biomass conversion to value-added products with a high atom economy. In the past decade, extensive studies have been conducted and promptly accumulated a rich knowledge in this field. In this chapter, we focus on the review of reaction mechanisms and kinetics after a brief description of the catalyst development for this process. In view of the different polyol products, the present review is mainly composed of two parts: cellulose conversion to sugar alcohols and cellulose hydrogenolysis to ethylene glycol and 1,2-propylene glycol. The reaction mechanisms are discussed and summarized to obtain general rules in terms of the specific performance of various catalysts. The reaction kinetics of cellulose hydrogenolysis are analyzed on the basis of the kinetics of the individual reaction steps and their correlations in the whole route covering in detail the reactions of cellulose hydrolysis, sugar hydrogenation, retro-aldol condensation, and sugar condensations. Finally, the prospective for the reaction mechanism and kinetics study of cellulose hydrogenolysis is presented.

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Section: Catalysts and Reaction Mechanismmentioning

confidence: 63%

Section: Catalysts and Reaction Mechanismmentioning

confidence: 99%

Mechanism and Kinetic Analysis of the Hydrogenolysis of Cellulose to Polyols

Wang

Pang

et al. 2016

Green Chemistry and Sustainable Technology

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“…For this purpose, carbon supports such as activated carbon, carbon nanofibers or carbon nanotubes are considered to be good candidates [35,39,[62][63][64]. Titanium oxide and silica are also highly valued [18,54,65].…”

Section: Other Supportsmentioning

confidence: 99%

“…It should be noted that "neutral" supports are sometimes studied in association with bases [53,62,63,65] …”

Section: Other Supportsmentioning

confidence: 99%

Transformation of Sorbitol to Biofuels by Heterogeneous Catalysis: Chemical and Industrial Considerations

Vilcocq

Cabiac

Especel

et al. 2013

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Résumé -Transformation du sorbitol en biocarburants par catalyse hétérogène : considérations chimiques et industrielles -La raréfaction du pétrole et l'augmentation conjointe de la demande en carburants ont conduit à la recherche de carburants alternatifs. Dans un premier temps, la valorisation de ressources agricoles alimentaires pour la production d'éthanol et de biodiesel a permis de développer les biocarburants de première génération. Aujourd'hui les travaux de recherche s'orientent vers l'utilisation de biomasse lignocellulosique comme source de carbone renouvelable (biocarburants de deuxième génération). Alors que la filière de l'éthanol cellulosique est en plein développement, une nouvelle voie consistant à transformer des sucres et polyols d'origine lignocellulosique en alcanes légers par catalyse hétérogène bifonctionnelle en phase aqueuse a été récemment décrite. Ce procédé s'effectue à basse température et pression modérée (T < 300 °C et P < 50 bar). Il nécessite, d'une part, la formation d'hydrogène par reformage catalytique de carbohydrates en phase aqueuse et, d'autre part, la déshydratation/hydrogénation de polyols conduisant à un alcane par ruptures sélectives des liaisons C-O. Un défi lié à cette thématique réside dans le développement de systèmes catalytiques multifonctionnels stables, actifs et sélectifs dans les conditions de la réaction de transformation. L'objectif de l'article est de présenter les réactions mises en jeu, les systèmes catalytiques décrits dans la littérature pour ce type de transformation ainsi que des exemples d'applications industrielles. Abstract

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“…Sun and Liu [9] reported a selectivity to glycols of 67% in the presence of 4%Ru/C catalyst in the hydrogenolysis of xylitol (Ca(OH) 2 , 10 wt % xylitol in the aqueous phase, 200 • C and 40 bar H 2 ). Zhao et al [16] observed a selectivity of 61% to glycols and glycerol over 3% Ru/carbon nanofibers. More recently, N-containing supports (amine-functionalized carbon nanotubes or covalent triazine framework) improved the performance of Ru-based catalysts in the presence of a base, in terms of activity [17] or yield of glycols and glycerol up to 85% [18].…”

Section: Introductionmentioning

confidence: 99%

Ru-(Mn-M)OX Solid Base Catalysts for the Upgrading of Xylitol to Glycols in Water

et al. 2018

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A series of Ru-(Mn-M)O X catalysts (M: Al, Ti, Zr, Zn) prepared by co-precipitation were investigated in the hydrogenolysis of xylitol in water to ethylene glycol, propylene glycol and glycerol at 200 • C and 60 bar of H 2 . The catalyst promoted with Al, Ru-(Mn-Al)O X , showed superior activity (57 h −1 ) and a high global selectivity to glycols and glycerol of 58% at 80% xylitol conversion. In comparison, the catalyst prepared by loading Ru on (Mn-Al)O X , Ru/(Mn-Al)O X was more active (111 h −1 ) but less selective (37%) than Ru-(Mn-Al)O X . Characterization of these catalysts by XRD, BET, CO 2 -TPD, NH 3 -TPD and TEM showed that Ru/(Mn-Al)O X contained highly dispersed and uniformly distributed Ru particles and fewer basic sites, which favored decarbonylation, epimerization and cascade decarbonylation reactions instead of retro-aldol reactions producing glycols. The hydrothermal stability of Ru-(Mn-Al)O X was improved by decreasing the xylitol/catalyst ratio, which decreased the formation of carboxylic acids and enabled recycling of the catalyst, with a very low deactivation.

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Hydrogenolysis of sorbitol to glycols over carbon nanofiber supported ruthenium catalyst

Cited by 110 publications

References 21 publications

Mechanism and Kinetic Analysis of the Hydrogenolysis of Cellulose to Polyols

Mechanism and Kinetic Analysis of the Hydrogenolysis of Cellulose to Polyols

Transformation of Sorbitol to Biofuels by Heterogeneous Catalysis: Chemical and Industrial Considerations

Ru-(Mn-M)OX Solid Base Catalysts for the Upgrading of Xylitol to Glycols in Water

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