Selectively catalytic oxidation of 1,2-propanediol to lactic, formic, and acetic acids over Ag nanoparticles under mild reaction conditions

Feng, Yonghai; Yin, Hengbo; Wang, Aili; Xue, Wei

doi:10.1016/j.jcat.2015.03.009

Cited by 24 publications

(14 citation statements)

References 31 publications

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“…The effect of reaction temperature and substrate concentration was similar to that for monometallic silver NPs [98]. The effect of the O 2 amount in the catalytic system was explored by variation of O 2 pressure in the case of Ag x Pd y /HAP samples and by variation of O 2 flow rate in the case of unsupported Ag x Pd y catalyst.…”

Section: Propylene Glycolmentioning

confidence: 90%

“…Partial oxidation of propylene glycol (PG) under gas-phase conditions is studied in a lesser extent than EG, while a large number of valuable chemicals can be produced on the basis thereof (e.g., hydroxyacetone (HA), methyl glyoxal (MeGO), lactaldehyde (LAld), acetol (Ac), lactic acid (LA), etc. [98,99]). Various catalytic systems were proposed for partial oxidation of PG, including bimetallic NPs on the basis of Au and Pt subgroup metals [100,101], oxide Fe-Mo catalysts [102], supported FePO 4 /SiO 2 catalysts [103], etc.…”

Section: Propylene Glycolmentioning

confidence: 99%

“…Various catalytic materials were proposed for the selective oxidation of PG [101,138]. Xue et al [98,139,140] Kolobova et al [136] studied several silver-promoted titania catalysts with or without the addition of Ce, Fe and Mg oxides in selective oxidation of n-octanol and betulin. The highest conversion value of n-octanol of 12% after 6 h experiment was reached over the Ag/CeO 2 /TiO 2 system.…”

Section: Propylene Glycolmentioning

confidence: 99%

“…Xue et al [98,139,140] explored the PG oxidation over unsupported and hydroxyapatite-supported silver and silver-palladium NPs as catalysts and molecular oxygen as an oxidant. According to the literature, the PG oxidation proceeds through two parallel mechanisms: (1) oxidation of the primary hydroxyl group of PG to LAld, which further rapidly transforms into LA; (2) oxidation of the secondary hydroxyl group of PG to yield HA, which can be further oxidized into MeGO or converted into LAld through tautomeric equilibration in alkaline media.…”

Section: Propylene Glycolmentioning

confidence: 99%

“…The enhancement of PG concentration from 0.14 M to 0.56 M reduced the substrate conversion, but led to the selective LA formation. The increase of The first example of PG oxidation over Ag catalysts to produce LA, FA and AcA was published by Feng and coworkers [98]. Generally, all catalysts were prepared by wet chemical reduction method in the presence of different organic modifiers such as tween-80 (Tween), polyvinylpyrrolidone (PVP, K90), sodiumdodecyl-benaenesulfonate (SDBS), d-sorbitol (DS) and citric acid (CA).…”

Section: Propylene Glycolmentioning

confidence: 99%

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Ag-Based Catalysts in Heterogeneous Selective Oxidation of Alcohols: A Review

et al. 2018

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Alcohols (bioalcohols) is a class of chemicals that are used as a feedstock for the manufacturing of a large number of valuable intermediates in industrially important processes. Currently, sustainable technologies for selective conversion of alcohols utilize “green” oxidants, mainly, ambient air or oxygen. Due to the high affinity of oxygen towards silver, the latter serves as an active component of supported heterogeneous catalysts. In this review, we consider Ag-based catalysts that participate in gas- or liquid-phase oxidation of alcohols. Oxidation of methanol, ethanol, ethylene glycol, propylene glycol, glycerol, benzyl and allyl alcohols is mostly considered. A particular attention is paid to selective photooxidation of alcohols over Ag-based catalysts. We discuss the catalyst composition in terms of (1) the state of the active component, (2) the nature of the substrate, (3) support nature, and (4) the strength of the metal–support interactions.

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Section: Propylene Glycolmentioning

confidence: 90%

Section: Propylene Glycolmentioning

confidence: 99%

Section: Propylene Glycolmentioning

confidence: 99%

Section: Propylene Glycolmentioning

confidence: 99%

Section: Propylene Glycolmentioning

confidence: 99%

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Ag-Based Catalysts in Heterogeneous Selective Oxidation of Alcohols: A Review

et al. 2018

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Selectivity Switch in the Aerobic 1,2‐Propandiol Oxidation Catalyzed by Diamine‐Stabilized Palladium Nanoparticles

et al. 2021

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Palladium nanoparticles stabilized by a sterically demanding secondary diamine ligand have been synthesized by hydrogen reduction of a palladium acetate complex bearing the corresponding diimine ligand. The obtained nanoparticles were used to catalyze the aerobic oxidation of 1,2‐propandiol in n‐hexane, and after their heterogenization onto a high surface area carbon, in water. In n‐hexane (2,4‐dimethyl‐1,3‐dioxolan‐2‐yl) methanol has been obtained as major product, whereas in water acetic acid with a selectivity of >85 % has been achieved. The selectivity switch observed was a clear induced by water. The robustness of diamine‐stabilized palladium nanoparticles under real aerobic oxidation conditions has been proved by recycling experiments, TEM measurements of the recovered catalysts and by comparison of its performance with that of palladium nanoparticles generated by the metal vapor synthesis technique and supported onto the same carbon in the absence of the stabilizing diamine ligand.

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