NaOH alone can be a homogeneous catalyst for selective aerobic oxidation of alcohols in water

Yuan, Zi-Fei; Zhao, Weina; Liu, Zhi-Pan; Xu, Bin

doi:10.1016/j.jcat.2017.05.006

Cited by 26 publications

(14 citation statements)

References 34 publications

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“…As mentioned in the beginning, the pH value of the reaction solution influences the glycerol conversion and selectivity significantly. At this point, it should also be mentioned that it was recently found that NaOH alone (i.e., in absence of a heterogeneous catalyst) acts as a homogeneous catalyst for the selective glycerol oxidation at prolonged reaction times and low conversions. , The addition of a base is crucial for Au catalysts to be able to effectively oxidize glycerol. On the other hand, the drawback of using a base is that the products are present as salts, and further processing is required afterward.…”

Section: Glycerol Oxidation Over Noble Metalsmentioning

confidence: 99%

“…Nonetheless, it remains of great concern to reduce the use of noble metals for various kinds of reactions and be able to perform such organic transformations with fewer noble and more earth-abundant metals. Although some efforts have been devoted to employ nonprecious homogeneous catalysts for the selective oxidation of glycerol, ,,− the reports presented in this section will focus on heterogeneous catalysts. A comprehensive overview over the use of non-noble metals as catalysts for the selective oxidation of glycerol is given.…”

Section: Glycerol Oxidation Over Nonprecious Metalsmentioning

confidence: 99%

“…Any cost assessment of the promising materials has then to be conducted individually based on the catalyst stability and the target product, but, by simple comparison of the metal prices, nonprecious-metal-containing catalysts already seem to be advantageous. In this context, it is worthy to mention that also studies demonstrating that the use of any metal catalyst can be avoided emerged, , which is a further step in the direction of a cost-efficient reaction process.…”

Section: Concluding Remarks and Prospectsmentioning

confidence: 99%

See 2 more Smart Citations

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%

Section: Glycerol Oxidation Over Nonprecious Metalsmentioning

confidence: 99%

Section: Concluding Remarks and Prospectsmentioning

confidence: 99%

See 1 more Smart Citation

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

2018

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“…In addition, they demonstrated that the oxygen atoms from the aqueous alkaline media, rather than from the molecular oxygen, preferentially react with the alcohol to promote the oxidation. Yuan et al 31 have recently disclosed the homogeneous catalytic effect of NaOH in the aqueous-phase oxidation of ethanol. Base-free conditions yielded lower alcohol oxidation rates than basic media.…”

Section: Clean Catalytic Oxidation Of Alcoholsmentioning

confidence: 99%

Clean Catalytic Oxidation for Derivatization of Key Biobased Platform Chemicals: Ethanol, Glycerol, and Hydroxymethyl Furfural

Ayude

Doumic

Cassanello

et al. 2019

Ind. Eng. Chem. Res.

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There has been a growing interest in the last decades in technologies that transform biomass-derived feedstock into renewable chemicals. A group of target molecules derived from biomass as key intermediates between raw materials and final products have been designed as "platform chemicals". Sustainable processes involve the use of renewable feedstock, but also pursue low energy consumption, the use of less hazardous materials, and diminished generation of waste. This review aims to present recent advances on environmentally friendly catalytic oxidation routes for transforming three platform chemicals, ethanol, glycerol, and 5-hydroxymethylfurfural, to value added intermediates and final products using air or oxygen as oxidants and water without additives (base-free) as solvent, and preferably under moderate operating conditions. Works carried out under continuous flow have been particularly reviewed.

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“…Among these aldehydes, benzaldehyde is the most widely investigated, which is conventionally produced by hydrolysis of benzyl chloride or by vapor-phase partial oxidation of toluene, whereas these processes yield traces of chlorine impurities and a substantial quantity of waste or result in sintering of catalysts, owing to high reaction temperatures (350 • C-450 • C) [6][7][8]. Some chlorine-free catalytic processes have been developed, but a large amount of waste has to be disposed of due to use of more than stoichiometric quantities of strong acid or bases, inorganic oxidants or complexes, such as dichromate, hypochlorite, permanganate, chromium(VI) oxide, and manganese(IV) oxide [9,10].…”

Section: Introductionmentioning

confidence: 99%

Steric Effects of Mesoporous Silica Supported Bimetallic Au-Pt Catalysts on the Selective Aerobic Oxidation of Aromatic Alcohols

Yan

Shan

et al. 2020

Catalysts

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Three series of catalysts consisting of gold (Au), platinum (Pt), or gold-platinum bimetallic nanoparticles (NPs) with controlled sizes (Au NPs 10 ± 2 nm, Pt NPs 6 ± 2 nm) anchored on hierarchical micro-/meso-/macroporous silica were successfully developed and systematically evaluated for the selective oxidation of aromatic alcohols to their corresponding aldehydes. The catalysts were prepared by the sol-immobilization method using as-made Au NPs and/or Pt NPs colloids; the silica supports were prepared with controlled pore structures and the hierarchical porous structures of catalysts were created by controllable desilication via the alkaline solution of the metal colloids. The catalysts were characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), X-ray Photoelectron Spectroscopy (XPS), and Inductively Coupled Plasma-Mass Spectrometry (ICP-MS), and these results showed no synergistic effect between Au and Pt on boosting the catalytic performance, whereas they demonstrated a clear dependence of catalytic conversions and reaction rates on the structural porosity of Au-Pt bimetallic catalysts. Our findings could potentially inspire peer researchers and scientists to develop designer porous catalysts and processes in the selective organic conversions.

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NaOH alone can be a homogeneous catalyst for selective aerobic oxidation of alcohols in water

Cited by 26 publications

References 34 publications

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

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

Clean Catalytic Oxidation for Derivatization of Key Biobased Platform Chemicals: Ethanol, Glycerol, and Hydroxymethyl Furfural

Steric Effects of Mesoporous Silica Supported Bimetallic Au-Pt Catalysts on the Selective Aerobic Oxidation of Aromatic Alcohols

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