Synthesis of pyruvic acid by vapour phase catalytic oxidative dehydrogenation of lactic acid

Lomate, Samadhan; Bonnotte, Thomas; Paul, Sébastien; Dumeignil, Franck; Katryniok, Benjamin

doi:10.1016/j.molcata.2013.05.006

Cited by 37 publications

(27 citation statements)

References 37 publications

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“…The PyA yield of 60% is the highest reported for oxidative dehydrogenation of LA under mild reaction conditions. 21 Based on the results presented above, we propose that the oxidative conversion of LA over the MoO 3 /TiO 2 catalysts follows the reaction paths shown in Scheme 2. The dominant reaction is dehydrogenation of LA to PyA.…”

Section: Supported Moo 3 /Tio 2 Catalystsmentioning

confidence: 86%

MoO₃–TiO₂ synergy in oxidative dehydrogenation of lactic acid to pyruvic acid

et al. 2017

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An efficient catalytic process for the oxidative dehydrogenation of biomass-derived lactic acid by earthabundant MoO 3 /TiO 2 mixed oxide catalysts is presented. A series of MoO 3 /TiO 2 materials with varied MoO 3 loadings were prepared and their performance in the aerobic and anaerobic conversion of lactic acid was evaluated. A strong synergistic effect between MoO 3 and TiO 2 components of the mixed oxide catalyst was observed. Optimum catalysts in terms of activity and pyruvic acid selectivity can be obtained by ensuring a high dispersion of MoO x species on the titania surface. Mo-oxide aggregates catalyze undesired side-reactions. XPS measurements indicate that the redox processes involving supported Mo ions are crucial for the catalytic cycle. A mechanism is proposed, in which lactic acid adsorbs onto basic sites of the titania surface and is dehydrogenated over the MovO acid-base pair of a vicinal tetrahedral Mo site. The catalytic cycle closes by hydrolysis of surface pyruvate and water desorption accompanied by the reduction of the Mo center, which is finally oxidized by O 2 to regenerate the initial active site. Under anaerobic conditions, a less efficient catalytic cycle is established involving a bimolecular hydrogen transfer mechanism, selectively yielding propionic and pyruvic acids as the major products. The optimum catalyst is 2 wt% MoO 3 /TiO 2 predominantly containing tetrahedral Mo species. With this catalyst the oxidative conversion of lactic acid at 200°C proceeds with a selectivity of ca. 80% to pyruvic acid. The pyruvic acid productivity is 0.56 g g −1 h −1 .

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Section: Supported Moo 3 /Tio 2 Catalystsmentioning

confidence: 86%

MoO₃–TiO₂ synergy in oxidative dehydrogenation of lactic acid to pyruvic acid

et al. 2017

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“…Dehydration of LA at the α‐hydroxyl position yields acrylic acid, which is the primary monomer for the synthesis of acrylate polymers . The oxidative dehydrogenation of LA gives pyruvic acid, which finds diverse applications in food, cosmetics, and pharmaceutical industries . Other important LA conversion routes include decarboxylation to acetaldehyde, condensation to 2,3‐pentanedione, and esterification to LA esters …”

Section: Introductionmentioning

confidence: 92%

Hydrogenation of Lactic Acid to 1,2‐Propanediol over Ru‐Based Catalysts

et al. 2018

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The catalytic hydrogenation of lactic acid to 1,2‐propanediol with supported Ru catalysts in water was investigated. The influence of catalyst support (activated carbon, γ‐Al2O3, SiO2, TiO2, and CeO2) and promoters (Pd, Au, Mo, Re, Sn) on the catalytic performance was evaluated. Catalytic tests revealed that TiO2 yields the best Ru catalysts. With a monometallic Ru/TiO2 catalyst, a 1,2‐propanediol yield of 70 % at 79 % lactic acid conversion was achieved at 130 °C after 20 h reaction. Minor byproducts of the hydrogenation reaction were propionic acid, ethanol, 1‐propanol, and 2‐propanol. For the bimetallic catalysts, the addition of Pd and Au slightly enhanced the performance of Ru/TiO2, whereas the addition of common hydrogenation promoters such as Re, Mo, and Sn impaired the activity.

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“…As examples, the synthesis of hydrogen, of liquid fuels and of precursors for plastics from renewable resources, catalysis plays a very important role [4,5]. In this context, lactic acid, which is often referred as a "sleeping giant", has attracted much attention as an alternative resource for the production of important chemicals such as acrylic acid, 1,2-propanediol, 2,3-pentanedione, pyruvic acid, [6] acetaldehyde [7] and mainly the polylactic acid (PLA) polymer [8,9]. Lactic acid can be easily be obtained by fermentation of renewable sources such as sugars and starches or even waste streams (cheesy whey for instance) [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

High yield lactic acid selective oxidation into acetic acid over a Mo-V-Nb mixed oxide catalyst

Lomate

Katryniok

Dumeignil

et al. 2015

sustain chem process

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In this paper, we report for the first time a one-pot reaction enabling total transformation of lactic acid to acetic acid over a Mo-V-Nb mixed oxide catalyst having an optimal atomic ratio 19:5:1. The mechanism of the reaction consists in two parallel ways leading to acetic acid: (i) oxi-dehydrogenation of lactic acid to pyruvic acid followed by decarboxylation and (ii) decarbonylation of lactic acid to acetaldehyde followed by oxidation. In the operating conditions we used, the catalyst is very active (total conversion of lactic acid) and selective towards acetic acid (100% selectivity). A 100% yield into acetic acid is hence obtained.

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Synthesis of pyruvic acid by vapour phase catalytic oxidative dehydrogenation of lactic acid

Cited by 37 publications

References 37 publications

MoO₃–TiO₂ synergy in oxidative dehydrogenation of lactic acid to pyruvic acid

MoO₃–TiO₂ synergy in oxidative dehydrogenation of lactic acid to pyruvic acid

Hydrogenation of Lactic Acid to 1,2‐Propanediol over Ru‐Based Catalysts

High yield lactic acid selective oxidation into acetic acid over a Mo-V-Nb mixed oxide catalyst

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Synthesis of pyruvic acid by vapour phase catalytic oxidative dehydrogenation of lactic acid

Cited by 37 publications

References 37 publications

MoO3–TiO2 synergy in oxidative dehydrogenation of lactic acid to pyruvic acid

MoO3–TiO2 synergy in oxidative dehydrogenation of lactic acid to pyruvic acid

Hydrogenation of Lactic Acid to 1,2‐Propanediol over Ru‐Based Catalysts

High yield lactic acid selective oxidation into acetic acid over a Mo-V-Nb mixed oxide catalyst

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MoO₃–TiO₂ synergy in oxidative dehydrogenation of lactic acid to pyruvic acid

MoO₃–TiO₂ synergy in oxidative dehydrogenation of lactic acid to pyruvic acid