Electro-oxidation competency of palladium nanocatalysts over ceria–carbon composite supports during alkaline ethylene glycol oxidation

Ethers can be found in the environment as structural, active or even pollutant molecules, although their degradation is not efficient under environmental conditions. Fungal unspecific heme-peroxygenases (UPO were reported to degrade low-molecular-weight ethers through an H2O2-dependent oxidative cleavage mechanism. Here, we report the oxidation of a series of structurally related aromatic ethers, catalyzed by a laboratory-evolved UPO (PaDa-I) aimed at elucidating the factors influencing this unusual biochemical reaction. Although some of the studied ethers were substrates of the enzyme, they were not efficiently transformed and, as a consequence, secondary reactions (such as the dismutation of H2O2 through catalase-like activity and suicide enzyme inactivation) became significant, affecting the oxidation efficiency. The set of reactions that compete during UPO-catalyzed ether oxidation were identified and quantified, in order to find favorable conditions that promote ether oxidation over the secondary reactions.

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Catalytic influence of underpotentially deposited submonolayers of different metals in ethylene glycol oxidation on various noble metal electrodes in alkaline medium

Journal of Power Sources ◽

10.1016/0378-7753(93)80031-j ◽

1993 ◽

Vol 46 (1) ◽

pp. 17-27 ◽

Cited By ~ 15

Author(s):

A.A. El-Shafei ◽

H.M. Shabanah ◽

M.N.H. Moussa

Keyword(s):

Ethylene Glycol ◽

Noble Metal ◽

Alkaline Medium ◽

Metal Electrodes ◽

Ethylene Glycol Oxidation ◽

Underpotentially Deposited

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Microporous Bio-Membrane Materials Based on High Molecular Weight Polylactide and Low Molecular Weight Poly(ethylene glycol)

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.567.123 ◽

2012 ◽

Vol 567 ◽

pp. 123-126

Author(s):

Teng Fei Shen ◽

Man Geng Lu ◽

Li Yan Liang

Keyword(s):

Molecular Weight ◽

Ethylene Glycol ◽

High Weight ◽

Low Molecular Weight ◽

Poly Ethylene Glycol ◽

Degradation Rates ◽

Degradation Behaviors ◽

The Mean ◽

Poly Ethylene ◽

Lower Glass Transition Temperature

In this work, microporous membrane biomaterials based on high weight molecular polylactide (PLA) and low molecular weight poly(ethylene glycol) (PEG) using rapid solvent evaporation method were prepared and investigated. The effect of PEG segments added on the thermal and degradation behaviors was studied. According to the results, produced PLA/PEG biomaterial has lower glass transition temperature (Tg)in comparison with neat PLA. It was also found that the degradation rates of the PLA/PEG biomaterials were significantly increased with adding of PEG, which explained by increasing hydrophilic groups. For better porous fixation, CL-blocked polyisocyanate (CL-bp), which was synthesized from reaction of isophorone diisocyanate (IPDI) with dimethylol propionic acid (DMPA) and Trimethylolpropane (TMP) followed by addition of caprolactam (CL), were introduced. The microporous forms were observed by the scanning electron microscope (SEM), which showed the mean diameters of prepared PLA/PEG microporous were around 10μm.

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