Synthesis of lactic acid from glycerol using a Pd/C catalyst

Marques, Fernanda Ribeiro Baptista; Oliveira, Alcinéia C.; Filho, J. Mendes; Rodríguez‐Castellón, Enrique; Cavalcante, Célio L.; Vieira, Rodrigo Silveira

doi:10.1016/j.fuproc.2015.05.032

Cited by 36 publications

(45 citation statements)

References 40 publications

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“…The peak corresponds to the first‐order scattering from the Raman‐active B 1g phonon mode, which involves only O motion along the c ‐axis . Metallic palladium is not visible by Raman spectroscopy . These results indicate that although XRD evidence fails to confirm the expected tetragonal close‐packed structure of PdO, it is surmised that PdO could be efficiently attached to the surface of HAP.…”

Section: Resultssupporting

confidence: 61%

“…For example, the significant reflection at 2 θ = 25.9°, 31.8°, 33.0°, 34.0° and 49.0° are commonly characteristic peaks of HAP. It is not possible to identify any crystalline phase associated with Pd species . This demonstrates that the dispersion of Pd species on the HAP carrier has been efficiently promoted, as further confirmed by TEM and XPS measurements.…”

Section: Resultssupporting

confidence: 53%

“…Fresh Pd 3 /HAP exhibits vibrational modes in the 645–651 cm −1 region, which is the main Raman mode of palladium oxide (PdO). However, this characteristic peak is absent in those catalysts with lower Pd loading . The peak corresponds to the first‐order scattering from the Raman‐active B 1g phonon mode, which involves only O motion along the c ‐axis .…”

Section: Resultsmentioning

confidence: 97%

“…Glycerol, with three functional hydroxyl groups, allows various selective catalytic transformations to chemicals (e.g. acrolein, acrylic acid, propanediol and lactic acid). Notably, glycerol selective oxidation to lactic acid has received growing attention, because it supports a new chemical route for large‐scale lactic acid production.…”

Section: Introductionmentioning

confidence: 99%

“…In order to solve this issue, glycerol catalytic conversion to lactic acid using heterogeneous catalysts has been investigated under both reductive and oxidative conditions. The catalytic performance of various supported noble and non‐noble metal catalysts has been explored in glycerol conversion to lactic acid, such as Cu catalysts (Cu/MgO, Cu/hydroxyapatite, Cu/ZrO 2 , Cu/SiO 2 , CuO/Al 2 O 3 ), Pt catalysts (Pt/C, Pt/TiO 2 , Pt/ZrO 2 , Pt/CaCO 3 , Pt/ZnO, Pt/SnO 2 , Pt/CeO 2 ), Au catalysts (Au/C , Au/CeO 2 , Au/TiO 2 ), Ru catalyst (Ru/C), Pd catalysts (Pd/C, Pd/TiO 2 ), Ir catalysts (Ir/CaCO 3 , Ir/C) and bimetallic supported catalysts (AuPd/TiO 2 , PtAu/CeO 2 , PtRu/C, AuRu/C, AuPt/TiO 2 , CuPd/graphene, PtSn/MFI, PtSn/BEA, AuPt/zeolites). Previous reports indicate that catalytic behavior depends mainly on alkali media and reaction temperature, as well as active components including the metal centera .…”

Section: Introductionmentioning

confidence: 99%

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Glycerol valorization to lactic acid catalyzed by hydroxyapatite‐supported palladium particles

Shen

Zhang

et al. 2018

J of Chemical Tech & Biotech

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BACKGROUND Catalytic formation of lactic acid from biomass glycerol is a sustainable alternative to the conventional fermentation process starting from carbohydrate and the chemical route using HCN and acetaldehyde. Highly concentrated glycerol can be effectively converted to lactic acid using hydroxyapatite‐supported palladium particles in the presence of NaOH. RESULTS The 3% hydroxyapatite‐supported palladium catalyst (Pd3/HAP) demonstrates excellent activity (TOF = 1274 h−1 for a batch time of 90 min) with a high selectivity (95%) towards lactic acid at 99% glycerol conversion (230 °C, NaOH:glycerol molar ratio = 1.1, and glycerol/total Pd intake = 1926). Under the same reaction conditions, the selectivities of lactic acid were 82% and 90% on Pd0.75/HAP and Pd1.5/HAP catalysts, respectively. The Pd3/HAP catalyst was recycled five times in a batch set‐up without a significant drop in activity and lactic acid selectivity, which is indicative of good catalyst stability. CONCLUSIONS Pd‐based catalysts on available hydroxyapatite supports are efficient catalysts for glycerol selective oxidation. The catalysts possess active PdO and Pd0 species well dispersed on the functionalized hydroxyapatite support. Pd0 nanoparticles and NaOH synergistically catalyze the reaction process. © 2018 Society of Chemical Industry

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Section: Resultssupporting

confidence: 61%

Section: Resultssupporting

confidence: 53%

Section: Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Glycerol valorization to lactic acid catalyzed by hydroxyapatite‐supported palladium particles

Shen

Zhang

et al. 2018

J of Chemical Tech & Biotech

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Glycerol valorization: conversion to lactic acid by heterogeneous catalysis and separation by ion exchange chromatography

Arcanjo

Silva

Cavalcante

et al. 2019

Biofuels Bioprod Bioref

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The consumption and production of biodiesel has grown dramatically in recent decades, motivated by a strong interest in renewable energy. This has generated a surplus of its main by‐product, glycerol. Several catalytic processes have been proposed to generate alternatives for using this excess glycerol, mainly focusing on its transformation into high value‐added chemical products. Various products, ranging from syngas to organic acids, such as acrylic or lactic acid, along with 1,2‐propanediol, 1,3‐propanediol, glycerol ethers or even polymers, have been produced starting from glycerol. Among this multitude of possibilities, the production of lactic acid is one of the most interesting alternatives to valorize glycerol, because of the wide range of applications described for this organic acid. This review focuses on recent studies dealing with the catalytic conversion of glycerol to lactic acid, using different heterogeneous catalysts, and evaluates the factors influencing the oxidation catalytic process and the proposed reaction mechanisms. Finally, recent studies on the separation and purification of lactic acid using ion exchange chromatography resins are also reported. © 2019 Society of Chemical Industry and John Wiley & Sons, Ltd

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Recent advances in the utilization of glycerol for the production of lactic acid by catalysis

Wang

Yang

et al. 2022

Biofuels Bioprod Bioref

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In this review, the research progress on catalytic conversion of glycerol to lactic acid or lactate esters and the reaction mechanisms with different catalysis systems are summarized. Both homogeneous catalysts, including inorganic bases and metal complexes, and heterogeneous catalysts, including metal oxides, molecular sieves, polyoxometalates and noble and non‐noble metals, are discussed. In particular, the influence of catalyst components, the physical and chemical properties of the catalysts and additives and solvents on the catalytic performances are highlighted. In comparison, nano‐metal particles or bimetal catalysts could achieve good catalytic performance, in which the alloy and synergistic effects might form under certain conditions. For further improvement of the sustainable transformation of glycerol to lactic acid or lactate esters, attention should still be paid to rational design of novel cost‐effective, high‐efficiency and green catalytic systems. © 2022 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Synthesis of lactic acid from glycerol using a Pd/C catalyst

Cited by 36 publications

References 40 publications

Glycerol valorization to lactic acid catalyzed by hydroxyapatite‐supported palladium particles

Glycerol valorization to lactic acid catalyzed by hydroxyapatite‐supported palladium particles

Glycerol valorization: conversion to lactic acid by heterogeneous catalysis and separation by ion exchange chromatography

Recent advances in the utilization of glycerol for the production of lactic acid by catalysis

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