Polyol Conversion by Liquid Phase Heterogeneous Catalysis Over Metals

Montassier, C.; Giraud, Denis; Barbier, Jean‐Pierre

doi:10.1016/s0167-2991(09)60811-9

Cited by 111 publications

(107 citation statements)

References 5 publications

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“…Analysis of the products from the APR reaction on sorbitol and 1-propanol on Pt/Al 2 O 3 also supports this mechanism [36,45]. The dismutation is carried out by a Cannizzaro reaction (basic catalysis) [18,46] or a Tischenko reaction (Lewis acid catalysis). The carboxylic acid formed then undergoes decarboxylation and produces a CO 2 molecule.…”

Section: Figurementioning

confidence: 62%

“…In 1989, Montassier et al [18,25] proposed the first mechanism for the sorbitol transformation in aqueous phase on a Raney Cu catalyst, then applied to a Ru/C catalyst and then Ru/C modified by sulphur, in the presence of hydrogen. This work showed that a first dehydrogenation of glycerol leads to glyceraldehyde, followed by a dehydration catalysed by an electrophilic site (M d+ metal site or acid site) (Fig.…”

Section: Dehydrogenation-dehydration-hydrogenation Of An Alcohol Groupmentioning

confidence: 99%

“…Under experimental conditions, the formation of several intermediate products has been observed: alcohols, ketones, alkenes. Figure 1 Mechanism of dehydrogenation-dehydration-hydrogenation of glycerol (from Montassier et al [18,25] Dehydration/hydrogenation of glycerol into propanediol.…”

Section: Dehydrogenation-dehydration-hydrogenation Of An Alcohol Groupmentioning

confidence: 99%

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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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Section: Figurementioning

confidence: 62%

Section: Dehydrogenation-dehydration-hydrogenation Of An Alcohol Groupmentioning

confidence: 99%

See 1 more Smart Citation

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

View full text Add to dashboard Cite

show abstract

“…This indicates that the type of support and its acidity influence the mechanism of the glycerol hydrogenolysis reaction. Another mechanism of glycerol hydrogenolysis, proposed in literature by Montassier et al [19], suggests glycerol dehydrogenation to glyceraldehyde followed by dehydration to 2-hydroxyacrolein. In this mechanism, 2-hydroxyacrolein is hydrogenated to 1,2-propanediol.…”

Section: Results Of Catalytic Activity Measurements In Hydrogenolysismentioning

confidence: 96%

Influence of the carrier and composition of active phase on physicochemical and catalytic properties of CuAg/oxide catalysts for selective hydrogenolysis of glycerol

et al. 2015

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The aim of the present study is to investigate the influence of the support and composition of the active bimetallic phase on both the physicochemical and catalytic properties of catalysts for use in glycerol hydrogenolysis reaction. Two series of catalysts with different amounts of copper oxide and/or silver supported on Al 2 O 3 or TiO 2 oxides were prepared. To determine the physicochemical properties of the catalysts, the following techniques were used: Brunauer-Emmett-Teller, reactive N 2 O adsorption, X-ray diffraction, and temperature-programmed reduction TPR-H 2 . Physicochemical characterization revealed that addition of silver modifies the redox properties of the catalysts containing copper oxide and influences their specific surface area. It was found that the type of carrier determines the catalytic activity and selectivities for desired products, strongly influencing their distribution. The Al 2 O 3 -supported catalysts were much more selective for 1,2-propanediol, whereas 1-propanol was the main reaction product for the titania-supported catalysts. The best catalysts (6Cu/Al and 2Cu/Ti) achieved 38 % glycerol conversion with 71 % selectivity for 1,2-propanediol and 44 % conversion with 62 % selectivity for 1-propanol, respectively.

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“…Copper containing catalysts of different composition are good catalysts for this purpose because of their poor hydrogenolytic activity toward C-C bonds and their efficient activity for hydrogenation or dehydrogenation of the C-O bond. 2,3 Most of literature works indicate that the system efficiency is highly determined by the catalyst type, temperature, hydrogen pressure, residence time and glycerol content of the aqueous solution used as feed.…”

Section: Introductionmentioning

confidence: 99%

Selective hydrogenolysis of glycerol to propylene glycol in a continuous flow trickle bed reactor using copper chromite and Cu/Al2O3 catalysts

Sepúlveda¹,

Manuale²,

Santiago³

et al. 2017

Quim. Nova

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CATALYSTS. The glycerol hydrogenolysis reaction was performed in a continuous flow trickle bed reactor using a water glycerol feed and both copper chromite and Cu/Al 2 O 3 catalysts. The commercial copper chromite had a higher activity than the laboratory prepared Cu/Al 2 O 3 and was used for most of the tests. Propylene glycol was the main product with both catalysts, acetol being the main by-product. It was found that temperature is the main variable influencing the conversion of glycerol. When the state of the glycerol-water reactant mixture was completely liquid, at temperatures lower than 190 °C, conversion was low and deactivation was observed. At reaction temperatures of 210-230 °C the conversion of glycerol was complete and the selectivity to propylene glycol was stable at about 60-80% all throughout the reaction time span of 10 h, regardless of the hydrogen pressure level (1 to 20 atm). These optimal values could not be improved significantly by using other different reaction conditions or increasing the catalyst acidity. At higher temperatures (245-250 °C) the conversion was also 100%. Under reaction conditions at which copper chromite suffered deactivation, light by-products and surface deposits were formed. The deposits could be completely burned at 250 °C and the catalyst activity fully recovered.

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Polyol Conversion by Liquid Phase Heterogeneous Catalysis Over Metals

Cited by 111 publications

References 5 publications

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

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

Influence of the carrier and composition of active phase on physicochemical and catalytic properties of CuAg/oxide catalysts for selective hydrogenolysis of glycerol

Selective hydrogenolysis of glycerol to propylene glycol in a continuous flow trickle bed reactor using copper chromite and Cu/Al2O3 catalysts

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