Near-limit oscillatory behaviors on wick flames of dimethyl carbonate with trimethyl phosphate additions

Identification of electrochemical reaction products in lithium–oxygen cells with 7Li nutation spectroscopy

Canadian Journal of Chemistry ◽

10.1139/cjc-2014-0577 ◽

2015 ◽

Vol 93 (9) ◽

pp. 976-982 ◽

Cited By ~ 3

Author(s):

Zoë E.M. Reeve ◽

Gillian R. Goward ◽

Alex D. Bain

Keyword(s):

Dimethyl Carbonate ◽

Tetraethylene Glycol ◽

The Novel ◽

Trimethyl Phosphate ◽

Reaction Products ◽

Battery System ◽

Nutation Frequency ◽

Main Discharge ◽

Discharge Product ◽

Phosphate Electrolyte

In the Li–O2 battery system, it is has been shown to be challenging to differentiate the discharge products or determine the electrolyte stability with direct 7Li NMR. Defined 7Li quadrupole lineshapes are not observed for cycled cathodes. Here, 7Li nutation NMR is demonstrated to be an effective method for the identification of Li2O2 in cycled cathodes. The 7Li quadrupole interaction of Li2O2 (35 kHz) and Li2CO3 (120 kHz) are of similar magnitude to typically radiofrequency fields (ranging from 40 to 60 kHz). The 7Li nutation frequency will therefore be influenced by both interactions. The discharge products of the cycled cathodes were determined by comparing the 7Li nutation frequencies of the cycled cathodes to the 7Li nutation frequency of the pristine materials when the applied radiofrequency field was 30 kHz. Li2CO3 was determined to be the main discharge product in the propylene carbonate/dimethyl carbonate and trimethyl phosphate electrolyte systems, since the 7Li nutation frequencies of the cathodes corresponded to the 7Li nutation frequency of pristine Li2CO3. The 7Li nutation frequency of the tetraethylene glycol dimethyl ether cathode was between the 7Li nutation frequencies of both pristine Li2O2 and pristine Li2CO3, indicating that both Li2O2 and Li2CO3 were discharge products influencing the observed nutation frequency. From 7Li nutation NMR the novel trimethyl phosphate electrolyte was determined to be an unsuitable Li–O2 electrolyte, as the fast 7Li nutation frequency indicated that Li2O2 was not a primary discharge species. With 17O NMR, Li2CO3 was confirmed to be a main discharge product formed with the trimethyl phosphate electrolyte.

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Conformational analysis of liquid dimethyl carbonate by molecular dynamics calculations

Molecular Physics ◽

10.1080/00268979809482199 ◽

1998 ◽

Vol 93 (1) ◽

pp. 153-158 ◽

Cited By ~ 7

Author(s):

OKIMASA OKADA

Keyword(s):

Molecular Dynamics ◽

Conformational Analysis ◽

Dimethyl Carbonate ◽

Molecular Dynamics Calculations

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SYNTHESIS OF 3-METHOXYCATECHOL FROM PYROGALLOL AND DIMETHYL CARBONATE IN LIQUID PHASE SLURRY REACTOR

Catalysis in Green Chemistry and Engineering ◽

10.1615/.2018020980 ◽

2018 ◽

Vol 1 (1) ◽

pp. 91-103

Author(s):

Pooja R. Tambe ◽

Riitta Keiski ◽

Ganapati D. Yadav

Keyword(s):

Liquid Phase ◽

Dimethyl Carbonate ◽

Slurry Reactor

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Synthesis of carbonate esters by carboxymethylation using NaAlO2 as a highly active heterogeneous catalyst

10.26434/chemrxiv.6204173 ◽

2018 ◽

Author(s):

Sreerangappa Ramesh ◽

Kiran Indukuri ◽

Olivier Riant ◽

Damien Debecker

Keyword(s):

Heterogeneous Catalyst ◽

Dimethyl Carbonate ◽

Sodium Aluminate ◽

High Yield ◽

Solid Catalyst ◽

Highly Active ◽

Aromatic Alcohols ◽

Green Conditions ◽

Mixed Carbonate

<p>Sodium aluminate is presented as a highly active heterogeneous catalyst able to convert a range of alcohols into the corresponding mixed carbonate esters, in high yield and under green conditions. The reaction is carried out using dimethyl carbonate both as a reactant and solvent, at 90°C. Allylic, aliphatic and aromatic alcohols are converted in good yields. The solid catalyst is shown to be truly heterogeneous, resistant to leaching, and recyclable. </p>

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