Pt supported TiO2-nanofibers and TiO2-nanopowder as catalysts for glycerol oxidation

Chornaja, Svetlana; Sīle, Elīna; Drunka, Reinis; Grabis, Jānis; Jankoviča, Dzidra; Kunakovs, J.; Dubencovs, Konstantīns; Zhizhkuna, Svetlana; Serga, Vera

doi:10.1007/s11144-016-1067-9

Cited by 14 publications

(12 citation statements)

References 53 publications

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“…Although supported Pt NPs were one of the first noble-metal catalysts investigated for glycerol oxidation initiated by Kimura et al in 1993, , there are still great efforts committed by several research groups in order to improve this system. − Unlike for Au catalysts, Pt catalysts can be used under acidic conditions. Generally, the main challenges lie in the achievement of higher resistances against oxygen poisoning and an improved selectivity toward dihydroxyacetone.…”

Section: Glycerol Oxidation Over Noble Metalsmentioning

confidence: 99%

Recent Advances in Thermo-, Photo-, and Electrocatalytic Glycerol Oxidation

2018

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Glycerol is a highly versatile molecule because of its three hydroxyl groups and can be transformed to a plethora of different value-added fine chemicals and products. It is an important byproduct in biodiesel production and, hence, produced in high amounts, which resulted in a high surplus flooding the market over the last decades. Thus, glycerol is regarded as a potential platform chemical, and many research efforts were devoted to find active catalysts to transform glycerol to various products via different catalytic processes. The selective oxidation reaction is one of the most promising reaction pathways to produce valuable fine chemicals used in the chemical and pharmaceutical industry. This Review describes the recent developments in selective glycerol oxidation to value-added products over heterogeneous catalysts. Particular emphasis is placed not only on newly developed catalysts based on supported noble-metal nanoparticles but also on catalysts containing nonprecious metals. The idea of using cost-efficient non-noble metals for glycerol oxidation is appealing from an economic point of view. Numerous parameters can influence the catalytic performance of the materials, which can be tuned by various synthetic approaches. The reasons for enhancements in activity are critically examined and put into perspective among the various studies. Moreover, during the past decade, many research groups also reported photocatalytic and, more scarcely, electrocatalytic pathways for glycerol oxidation, which are also described in detail herein and have otherwise found little attention in other reviews.

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Section: Glycerol Oxidation Over Noble Metalsmentioning

confidence: 99%

Recent Advances in Thermo-, Photo-, and Electrocatalytic Glycerol Oxidation

2018

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“…Among a variety of bio-derived carboxylic acids, glyceric acid (GLYA) and lactic acid (LA) are two mostly studied carboxylic derivatives for glycerol oxidation. Noble-metal catalysts based on Au [5][6][7][8], Pt [9][10][11][12][13][14], and Pd [15][16][17] and alloys have been widely investigated for oxidation of glycerol due to their high activity. Recent review papers have suggested that, existing studies have been primarily focused on the compositional dependence of those metal catalysts on the formation of GLYA and LA [1][2][3][4]18].…”

Section: Introductionmentioning

confidence: 99%

Electronically Coupled PtCo/MgAl Hydrotalcite Catalysts Display Tunable Selectivity Toward Glyceric Acid and Lactic Acid for Glycerol Conversion

Liu

Yan

et al. 2020

Catal Lett

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Selective oxidation of glycerol is one of the most promising routes to produce value-added fine chemicals from biomass. However, achieving good selectivity towards glyceric and lactic acids still remains a grand challenge in this field. A series of unique electronically coupled PtCo catalysts, supported on layered double hydroxides via co-precipitation method, was reported in this work, as they display tunable selectivity toward glyceric acid and lactic acid during glycerol conversion. It is found that the unusual electronic transfer from MgAl hydrotalcite support to cobalt species, leading to high electron binding energy of PtCo sites on catalyst surface. The presence of cobalt components contributes to synergistic enhancement of oxidation activity at electron deficient Pt sites and more critically, weakened Pt-O strength during glycerol conversion. Such unique electronic reconfiguration, as characterized by XRD and XPS spectroscopy, induces two alternative reaction pathways under different reaction temperatures. While Pt-O bonding strength is significantly weakened by strong Co-O affinity at relatively higher reaction temperature (100 °C), such effect is almost negligible at 50 °C. As a result, lactic acid selectivity of 67% was obtained at 100 °C, while glyceric acid selectivity of 65% was achieved at 50 °C, over the bifunctional PtCo/MgAl hydrotalcite catalysts. The design principles reported in this work offer alternative approaches for manufacturing cost-effective catalytic materials for glycerol conversion to various value-added carboxylic acids and derivatives.

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“…There is thus an increasing surplus of glycerol, creating a need to develop alternative ways to use residual glycerol. 2 Due to its high functionalization, glycerol can be transformed into several value-added products ( Table 1), such as lactic acid, [3][4][5] glyceric acid, 6-8 glycolic acid, [9][10][11] oxalic acid, 9,12 dihydroxyacetone, [13][14][15] glyceraldehyde, [16][17][18] 1,2-propanediol, [19][20][21] 1,3-propanediol, 22-24 1-propanol, 25,26 acrylic acid, [27][28][29] acrolein, [30][31][32] syngas, [33][34][35] mono-, di-, tri-glycerides, [36][37][38] triacetin, [39][40][41] glycerol oligomers, 42,43 and polymers. 44 Lactic acid is conventionally used as an acidulant and preservative in the food industry, in the chemical industry 45,46 as raw material for the production of pharmaceuticals, 47 cosmetics, 48 textiles, 49 leather,…”

Section: Reactionmentioning

confidence: 99%

“…Due to its high functionalization, glycerol can be transformed into several value‐added products (Table ), such as lactic acid, glyceric acid, glycolic acid, oxalic acid, dihydroxyacetone, glyceraldehyde, 1,2‐propanediol, 1,3‐propanediol, 1‐propanol, acrylic acid, acrolein, syngas, mono‐, di‐, tri‐glycerides, triacetin, glycerol oligomers, and polymers . Lactic acid is conventionally used as an acidulant and preservative in the food industry, in the chemical industry as raw material for the production of pharmaceuticals, cosmetics, textiles, leather, and, in a fast‐growing niche market, as monomer for the biodegradable polymer poly‐(lactic acid) or PLA .…”

Section: Introductionmentioning

confidence: 99%

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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Pt supported TiO2-nanofibers and TiO2-nanopowder as catalysts for glycerol oxidation

Cited by 14 publications

References 53 publications

Recent Advances in Thermo-, Photo-, and Electrocatalytic Glycerol Oxidation

Recent Advances in Thermo-, Photo-, and Electrocatalytic Glycerol Oxidation

Electronically Coupled PtCo/MgAl Hydrotalcite Catalysts Display Tunable Selectivity Toward Glyceric Acid and Lactic Acid for Glycerol Conversion

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

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