The gaseous oxidation of diethyl ether

doi:10.1098/rspa.1959.0151

“…Effective heating times used at 900, 1000, 1100, 1200, 1300, 1400, 1500, 1600, and 1700 K were 1.8, 1.73, 1.65, 1.58, 1.5, 1.43, 1.35, 1.2, and 1.2 ms, respectively. Symbols, experiment from ref ; dashed line, original mechanism; dotted line, improved mechanism; and solid lines, reduced mechanism.…”

Section: Construction and Validation Of The Reduced Mechanismmentioning

confidence: 99%

“…Constructing a wide range of applicable reaction mechanisms of DEE to understand its combustion behavior is therefore of high practical interest. Waddington studied the gaseous oxidation of DEE in the low-temperature region in detail and discussed the principal products generated during the induction period . Griffiths and Inomata investigated the oscillatory cool flames of DEE/air in a jet-stirred flow reactor and developed a mechanism with 92 reactions .…”

Section: Introductionmentioning

confidence: 99%

Improved Kinetic Mechanism for Diethyl Ether Oxidation with a Reduced Model

Tang

¹

,

Zhang

²

,

Chen

³

et al. 2017

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An improved diethyl ether (DEE) reaction mechanism consisting of 174 species and 973 reactions has been proposed. The present model is derived from an original model of Yasunaga et al. [A multiple shock tube and chemical kinetic modeling study of diethyl ether pyrolysis and oxidationYasunagaK.GillespieF.SimmieJ. M.CurranH. J.KuraguchiY.HoshikawaH.YamaneM.HidakaY. Yasunaga, K. Gillespie, F. Simmie, J. M. Curran, H. J. Kuraguchi, Y. Hoshikawa, H. Yamane, M. Hidaka, Y. J. Phys. Chem. A201011490989109]. On the basis of shock tube results in the temperature range of 900–1900 K, pressure range of 1–40 bar, and equivalence ratios of 0.5–2 as well as rapid compression machine (RCM) measurements of a stoichiometric DEE/O2/inert gas mixture at temperatures of 500–900 K and pressures of 3–4 bar, the ignition delay times (IDTs) were validated. Two-stage ignition at temperatures below 650 K and negative temperature coefficient (NTC) behavior at temperatures between 621 and 746 K are observed. In addition, the freely propagating flame velocities of a stoichiometric DEE/air mixture were validated at various temperatures as well. Using directed relation graph (DRG)-based methods for the improved mechanism reduction, a reduced mechanism composed of 80 species and 329 reactions has been achieved. Calculations for IDTs, laminar flame velocities, and temperature and species profiles using the reduced mechanism show very close agreement with those obtained using the improved mechanism. Meanwhile, sensitivity analyses of the burning velocity and IDT for the improved and reduced mechanisms were performed. Competing reactions related to DEE + OH and consumption of C2H5OC2H4s and HO2 were identified as being important for IDTs at various temperatures.

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“…2) The Achilles heel of most organic electrolytes is their long-term stability as they are prone to autoxidation under oxygenated radicals (formed during cell operation), being converted into unstable peroxide species. [5][6][7][8][9][10][11] 3) Low surface tension between the carbon surface of the air cathode and most organic electrolytes results in flooding of the air electrode and hence, only dissolved [11] O 2 participates in the actual oxygen reduction reaction (ORR) and the associated charge-transfer reaction, occurring in the two-phase boundary reaction zone. [12] One approach to tackle all of the above problems is to design a liquid-free Li-O 2 cell which is safer and is based on a solid polymer electrolyte (Scheme 1).…”

mentioning

confidence: 99%

Liquid‐Free Lithium–Oxygen Batteries

Balaish

¹

,

Peled

²

,

Golodnitsky

³

et al. 2014

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Non-aqueous lithium-oxygen batteries are considered as most advanced power sources, albeit they are facing numerous challenges concerning almost each cell component. Herein, we diverge from the conventional and traditional liquid-based non-aqueous Li-O 2 batteries to a Li-O 2 system based on a solid polymer electrolyte (SPE-) and operated at a temperature higher than the melting point of the polymer electrolyte, where useful and most applicable conductivity values are easily achieved. The proposed SPE-based Li-O 2 cell is compared to Li-O 2 cells based on ethylene glycol dimethyl ether (glyme) through potentiodynamic and galvanostatic studies, showing a higher cell discharge voltage by 80 mV and most significantly, a charge voltage lower by 400 mV. The solid-state battery demonstrated a comparable dischargespecific capacity to glyme-based Li-O 2 cells when discharged at the same current density. The results shown here demonstrate that the safer PEO-based Li-O 2 battery is highly advantageous and can potentially replace the contingent of liquid-based cells upon further investigation.Rechargeable Li-O 2 batteries based on non-aqueous electrolytes attracted much attention in recent years due to their outstanding theoretical energy density of about 3500 W h kg À1 . [1][2][3][4] However, there are some critical challenges regarding the electrolyte, hindering the actualization of a Li-O 2 battery as a high-energy storage device: 1) Most common organic liquid electrolytes are volatile and hence, are less suited for the Li-O 2 battery, which is in essence an open system. 2) The Achilles heel of most organic electrolytes is their long-term stability as they are prone to autoxidation under oxygenated radicals (formed during cell operation), being converted into unstable peroxide species. [5][6][7][8][9][10][11] 3) Low surface tension between the carbon surface of the air cathode and most organic electrolytes results in flooding of the air electrode and hence, only dissolved [11] O 2 participates in the actual oxygen reduction reaction (ORR) and the associated charge-transfer reaction, occurring in the two-phase boundary reaction zone. [12] One approach to tackle all of the above problems is to design a liquid-free Li-O 2 cell which is safer and is based on a solid polymer electrolyte (Scheme 1). Polymers are expected to exhibit higher chemical, thermal, and electrochemical stabilities (see Figure S1 in the Supporting Information). Moreover, not only that the polymer can ensure safe cell operation, but it would also minimize oxygen crossover towards the anode and would totally eliminate the use of a separator in the cell. Despite the advantages pointed out, SPE has high internal resistance at room temperature, resulting from a low ionic mobility, high degree of polymer matrix crystallinity, and low degree of charge separation in addition to ion association, preventing their practical use as electrolyte in Li-O 2 batteries, unless inorganic fillers such as ZrO 2 , Al 2 O 3 , SiO 2 , TiO 2 , and/or anion traps are used. [13][...

show abstract

Liquid‐Free Lithium–Oxygen Batteries

Balaish

¹

,

Peled

²

,

Golodnitsky

³

et al. 2014

View full text Add to dashboard Cite

Non-aqueous lithium-oxygen batteries are considered as most advanced power sources, albeit they are facing numerous challenges concerning almost each cell component. Herein, we diverge from the conventional and traditional liquid-based non-aqueous Li-O2 batteries to a Li-O2 system based on a solid polymer electrolyte (SPE-) and operated at a temperature higher than the melting point of the polymer electrolyte, where useful and most applicable conductivity values are easily achieved. The proposed SPE-based Li-O2 cell is compared to Li-O2 cells based on ethylene glycol dimethyl ether (glyme) through potentiodynamic and galvanostatic studies, showing a higher cell discharge voltage by 80 mV and most significantly, a charge voltage lower by 400 mV. The solid-state battery demonstrated a comparable discharge-specific capacity to glyme-based Li-O2 cells when discharged at the same current density. The results shown here demonstrate that the safer PEO-based Li-O2 battery is highly advantageous and can potentially replace the contingent of liquid-based cells upon further investigation.

show abstract

The gaseous oxidation of diethyl ether

Cited by 14 publications

References 18 publications

Improved Kinetic Mechanism for Diethyl Ether Oxidation with a Reduced Model

Improved Kinetic Mechanism for Diethyl Ether Oxidation with a Reduced Model

Liquid‐Free Lithium–Oxygen Batteries

Liquid‐Free Lithium–Oxygen Batteries

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