Glycerol Oxidation in the Liquid Phase over a Gold-Supported Catalyst: Kinetic Analysis and Modelling

Díaz, José A.; Skrzyńska, Elżbieta; Girardon, Jean‐Sébastien; Capron, Mickäel; Dumeignil, Franck; Fongarland, Pascal

doi:10.3390/chemengineering1010007

Cited by 10 publications

(15 citation statements)

References 28 publications

(43 reference statements)

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“…These models are commonly used realistic approach to derive the rate expression for heterogeneous reactions. The selection of models was based on the analysis of literature data on the kinetic modeling of the conversion of glycerol into PG [37], LA [38,39] and other carboxylic acids [40] in an alkaline media.…”

Section: Proposed Kinetic Modelmentioning

confidence: 99%

Mechanism Analysis and Kinetic Modelling of Cu NPs Catalysed Glycerol Conversion into Lactic Acid

et al. 2019

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Mechanism analysis and kinetic modeling of glycerol conversion into lactic acid in the alkaline media with and without heterogeneous catalyst Cu NPs are reported. The reaction pathways were determined in agreement with the experimental results and comprise several types of reactions, namely dehydrogenation, hydrogenolysis, dehydration and C–C cleavage. Experimental concentration-time profiles were obtained in a slurry batch reactor at different glycerol, NaOH and Cu NPs concentrations in a temperature range of 483–518 K. Power law, Langmuir–Hinshelwood (LH) and Eley–Rideal (ER) models were chosen to fit the experimental data. The proposed reaction pathways and obtained kinetic model adequately describe the experimental data. The reaction over Cu NPs catalyst in the presence of NaOH proceeds with a significantly lower activation barrier (Ea = 81.4 kJ∙mol−1) compared with the only homogeneous catalytic conversion (Ea = 104.0 kJ∙mol−1). The activation energy for glycerol hydrogenolysis into 1,2-propanediol on the catalyst surface without adding hydrogen is estimated of 102.0 kJ∙mol−1. The model parameters obtained in this study would be used to scale an industrial unit in a reactor modeling.

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Section: Proposed Kinetic Modelmentioning

confidence: 99%

Mechanism Analysis and Kinetic Modelling of Cu NPs Catalysed Glycerol Conversion into Lactic Acid

et al. 2019

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“…Elimination of internal mass transfer on the reaction was confirmed by checking using the Weisz− Prater criterion. The Weisz−Prater number, N W−P,i−j , was calculated using the following equation: 54,55…”

Section: Oxidation Of Different Amino Alcoholsmentioning

confidence: 99%

Selective Oxidation of Amino Alcohols to Amino Acids over Au Supported on Monoclinic ZrO₂: Dominant Active Sites and Kinetic Study

Meng

Zhang

et al. 2019

Ind. Eng. Chem. Res.

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Au supported on monoclinic ZrO 2 (Au/m-ZrO 2 ) prepared by deposition−precipitation method showed excellent catalytic performance in the aerobic oxidation of amino alcohols to amino acids, i.e., glycine, alanine, serine, β-alanine, and 2-aminobutyric acid. The Au particle size and valence distribution of the gold species were adjusted by calcination temperature, as demonstrated by XRD, TEM, UV−vis DRS, XPS, and H 2 -TPR, which significantly influenced the catalytic activity but not the selectivity of amino acids. Metallic gold atoms on the surface were shown to be the active sites by the correlation between reaction rate per mole of metallic Au and Au particle size. The kinetics of oxidation of monoethanolamine (MEA) was studied in detail, and the results indicated that MEA oxidation is a first-order reaction with an activation energy of 52.8 kJ•mol −1 .

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“…From the data presented in Table 1 . [28][29][30] However, it is well established that AuPt/TiO2 catalysts are substantially more active than monometallic Au catalysts for this reaction, 31 which could provide explanation for the lower activation energy observed in this study.…”

Section: Synthesis and Characterisation Of The Model Aupt/tio2 Catalystmentioning

confidence: 60%

Enhancing the understanding of the glycerol to lactic acid reaction mechanism over AuPt/TiO2 under alkaline conditions

Evans

Douthwaite

Carter

et al. 2020

The Journal of Chemical Physics

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The oxidation of glycerol under alkaline conditions in the presence of a heterogeneous catalyst can be tailored to the formation of lactic acid; an important commodity chemical. Despite recent advances in this area, the mechanism for its formation is still a subject of contention. In this study, we use a model 1 wt.% AuPt/TiO2 catalyst to probe this mechanism through conducting a series of isotopic labelling experiments with 1,3-13 C glycerol. Optimisation of the reaction conditions was first conducted to ensure high selectivity to lactic acid in the isotopic labelling experiments. Selectivity to lactic acid increased with temperature and concentration of NaOH, but increasing the O2 pressure appeared to only influence rate of reaction. Using 1,3-13 C glycerol we demonstrate that conversion of pyruvaldehyde to lactic acid proceeds via a base-promoted 1,2-hydride shift, to produce lactic acid. There was no evidence to suggest that this occurs via a 2,1-methide shift under the conditions used in this study.

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Glycerol Oxidation in the Liquid Phase over a Gold-Supported Catalyst: Kinetic Analysis and Modelling

Cited by 10 publications

References 28 publications

Mechanism Analysis and Kinetic Modelling of Cu NPs Catalysed Glycerol Conversion into Lactic Acid

Mechanism Analysis and Kinetic Modelling of Cu NPs Catalysed Glycerol Conversion into Lactic Acid

Selective Oxidation of Amino Alcohols to Amino Acids over Au Supported on Monoclinic ZrO₂: Dominant Active Sites and Kinetic Study

Enhancing the understanding of the glycerol to lactic acid reaction mechanism over AuPt/TiO2 under alkaline conditions

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Glycerol Oxidation in the Liquid Phase over a Gold-Supported Catalyst: Kinetic Analysis and Modelling

Cited by 10 publications

References 28 publications

Mechanism Analysis and Kinetic Modelling of Cu NPs Catalysed Glycerol Conversion into Lactic Acid

Mechanism Analysis and Kinetic Modelling of Cu NPs Catalysed Glycerol Conversion into Lactic Acid

Selective Oxidation of Amino Alcohols to Amino Acids over Au Supported on Monoclinic ZrO2: Dominant Active Sites and Kinetic Study

Enhancing the understanding of the glycerol to lactic acid reaction mechanism over AuPt/TiO2 under alkaline conditions

Contact Info

Product

Resources

About

Selective Oxidation of Amino Alcohols to Amino Acids over Au Supported on Monoclinic ZrO₂: Dominant Active Sites and Kinetic Study