Study of the stability of Pt/SiO2–Al2O3 catalysts in aqueous medium: Application for sorbitol transformation

Vilcocq, Léa; Cabiac, Amandine; Especel, Catherine; Lacombe, Sylvie; Duprez, Daniel

doi:10.1016/j.catcom.2011.08.002

Cited by 31 publications

(46 citation statements)

References 12 publications

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“…The development of procedures for in-situ determination of leaching might be is preferablerequired. In line with thisThus, Granados and coworkers developed an in-situ method to indirectly estimate the amount of leaching in the case of transesterification of triglycerides to produce biodiesel with CaO 35 by using conductivity measurements. Another important factor to take into account is that the 40 detection limit of the analytical techniques employed has to be very low to provide significant results.…”

Section: Detection Of the Leaching Process And Activity Ofmentioning

confidence: 99%

“…In the presence of water, some oxides can form the corresponding hydroxide, with increased solubility. 41 In the case of oxidation reactions with immobilized metals, leaching is generally due to the 35 solvolysis of the metal-oxygen bonds, through which the active site is attached to the support. 26 Leaching is particularly increased in the case of oxometal species (e.g.…”

Section: Mechanisms Of Deactivation By Leachingmentioning

confidence: 99%

“…2 Water is the preferred option for a solvent, 3 but organic polar solvents, 4 as well asor even ionic liquids [5][6][7] have been employed in a great number of recent research studieses. Some examples of these liquid-phase reactions can be found in the catalytic 35 transformation of the lignocellulosic biomass to chemicals and fuels, [8][9][10] including the hydrolysis of cellulose, 11,12 dehydration of carbohydrates 13,14 and the subsequent transformation of the platform molecules to value-added chemicals and fuels 15,16 or lignin depolymerization. 17,18 Also, the transesterification reaction 40 of vegetable oils to produce biodiesel (fatty acid methyl esters, FAME) is carried out in the presence of very polar methanol, 19 and the valorization of the sub-product glycerol proceeds in liquid medium.…”

Section: Introductionmentioning

confidence: 99%

“…The present review shows some examples of deactivation of catalysts studied in literature related to biomass conversion 35 reactions. Nonetheless, the aim of the authors is not to make a thoroughrough study of all the published work articleswithin this field, but to offer the reader the main guidelines and some representative and illustrative examples.…”

Section: Introductionmentioning

confidence: 99%

“…This is the case in some reactions of oxidation of alcohols in liquid medium. 43,44 Occasionally, a change of phase 35 of the support during the reaction can have a beneficial effect, as in the case of alumina-supported Ptplatinum catalyst in APRthe aqueous phase reforming of glycerol. Here, the initial alumina forms bohemite, which is active in the reaction of dehydration of glycerol.…”

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confidence: 99%

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Deactivation of solid catalysts in liquid media: the case of leaching of active sites in biomass conversion reactions

et al. 2015

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Section: Detection Of the Leaching Process And Activity Ofmentioning

confidence: 99%

Section: Mechanisms Of Deactivation By Leachingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Deactivation of solid catalysts in liquid media: the case of leaching of active sites in biomass conversion reactions

et al. 2015

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Stability of Amorphous Silica–Alumina in Hot Liquid Water

et al. 2013

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Herein, the hydrothermal stability of amorphous silica-alumina (ASA) is investigated under conditions relevant for the catalytic conversion of biomass, namely in liquid water at 200 °C. The hydrothermal stability of ASA is much higher than that of pure silica or alumina. Interestingly, the synthetic procedure used plays a major role in its resultant stability: ASA prepared by cogelation (CG) lost its microporous structure, owing to hydrolysis of the siloxane bonds, but the resulting mesoporous material still had a considerable surface area. ASA prepared by deposition precipitation (DP) contained a silicon-rich core and an aluminum-rich shell. In hot liquid water, the latter structure was transformed into a layer of amorphous boehmite, which protected the particle from further hydrolysis. The surface area showed relatively minor changes during the transformation. Independent of the synthetic method used, the ASAs retained a considerable concentration of acid sites. The concentration of acid sites qualitatively followed the changes in surface area, but the changes were less pronounced. The performance of different ASAs for the hydrolysis of cellobiose into glucose is compared.

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Catalytic Total Hydrodeoxygenation of Biomass‐Derived Polyfunctionalized Substrates to Alkanes

et al. 2015

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The total hydrodeoxygenation of carbohydrate-derived molecules to alkanes, a key reaction in the production of biofuel, was reviewed from the aspect of catalysis. Noble metals (or Ni) and acid are the main components of the catalysts, and group 6 or 7 metals such as Re are sometimes added as modifiers of the noble metal. The main reaction route is acid-catalyzed dehydration plus metal-catalyzed hydrogenation, and in some systems metal-catalyzed direct CO dissociation is involved. The appropriate active metal, acid strength, and reaction conditions depend strongly on the reactivity of the substrate. Reactions that use Pt or Pd catalysts supported on Nb-based acids or relatively weak acids are suitable for furanic substrates. Carbohydrates themselves and sugar alcohols undergo CC dissociation easily. The systems that use metal-catalyzed direct CO dissociations can give a higher yield of the corresponding alkane from carbohydrates and sugar alcohols.

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Study of the stability of Pt/SiO2–Al2O3 catalysts in aqueous medium: Application for sorbitol transformation

Cited by 31 publications

References 12 publications

Deactivation of solid catalysts in liquid media: the case of leaching of active sites in biomass conversion reactions

Deactivation of solid catalysts in liquid media: the case of leaching of active sites in biomass conversion reactions

Stability of Amorphous Silica–Alumina in Hot Liquid Water

Catalytic Total Hydrodeoxygenation of Biomass‐Derived Polyfunctionalized Substrates to Alkanes

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