Measurements of H2O2 in low temperature dimethyl ether oxidation

Guo, Huijun; Sun, Wenting; Haas, Francis M.; Farouk, Tanvir; Dryer, Frederick L.; Ju, Yiguang

doi:10.1016/j.proci.2012.05.056

Cited by 71 publications

(54 citation statements)

References 17 publications

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“…Flame speciation using electron-ionization molecular-beam mass spectrometry was measured. Guo et al [39] measured low temperature species profiles in an atmospheric flow reactor with electron-ionization molecular-beam mass spectrometry used as the detection system. Herrmann et al [40] used an atmospheric flow reactor to measure mole fractions of species related to DME oxidation at low temperatures (400−1200 K) by time-of-flight mass spectrometry.…”

Section: Introductionmentioning

confidence: 99%

An ignition delay and kinetic modeling study of methane, dimethyl ether, and their mixtures at high pressures

Burke

Somers

O’Toole

et al. 2015

Combustion and Flame

384

279

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The development of accurate chemical kinetic models capable of predicting the combustion of methane and dimethyl ether in common combustion environments such as compression ignition engines and gas turbines is important as it provides valuable data and understanding of these fuels under conditions that are difficult and expensive to study in the real combustors. In this work, both experimental and chemical kinetic model-predicted ignition delay time data are provided covering a range of conditions relevant to gas turbine environments (T = 600 − 1600 K, p = 7 − 41 atm, φ = 0.3, 0.5, 1.0, and 2.0 in 'air' mixtures). The detailed chemical kinetic model (Mech 56.54) is capable of accurately predicting this wide range of data, and it is the first mechanism to incorporate high-level rate constant measurements and calculations where available for the reactions of DME. This mechanism is also the first to apply a pressure-dependent treatment to the low-temperature reactions of DME. It has been validated using available literature data including flow reactor, jet-stirred reactor, shock-tube ignition delay times, shock-tube speciation, flame speed, and flame speciation data. New ignition delay time measurements are presented for methane, dimethyl ether, and their mixtures; these data were obtained using three different shock tubes and a rapid compression machine. In addition to the DME/CH 4 blends, high-pressure data for pure DME and pure methane were also obtained. Where possible, the new * address:

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Section: Introductionmentioning

confidence: 99%

An ignition delay and kinetic modeling study of methane, dimethyl ether, and their mixtures at high pressures

Burke

Somers

O’Toole

et al. 2015

Combustion and Flame

384

279

View full text Add to dashboard Cite

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“…DME represents the simplest molecular structure (CH 3 OCH 3 ) with rich lowtemperature chemistry and the recent experiments with advanced diagnostics clearly showed that the description of DME's low-temperature chemistry has a large uncertainty in the decomposition pathways and/or the branching ratio of the keto-hydroperoxide species. 18,22,25 Given its great application potential and the simplicity in molecular structure, the hightemperature combustion chemistry of DME has also been extensively studied. [31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47] Because of the importance of low-temperature chemistry in determining fuel effects in autoignition, the present paper focuses on the key reactions and intermediates of the low-temperature regime, and the results of the high-temperature chemistry studies will not be reviewed here.…”

Section: Introductionmentioning

confidence: 99%

Detection and Identification of the Keto-Hydroperoxide (HOOCH₂OCHO) and Other Intermediates during Low-Temperature Oxidation of Dimethyl Ether

et al. 2015

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In this paper we report the detection and identification of the keto-hydroperoxide (hydroperoxymethyl formate, HPMF, HOOCH 2 OCHO) and other partially oxidized intermediate species arising from the low-temperature (540 K) oxidation of dimethyl ether (DME). These observations were made possible by coupling a jet-stirred reactor with molecular-beam sampling capabilities, operated near atmospheric pressure, to a reflectron time-of-flight mass spectrometer that employs single-photon ionization via tunable synchrotron-generated vacuum-ultraviolet radiation. Based on experimentally observed ionization thresholds and fragmentation appearance energies, interpreted with the aid of ab initio calculations, we have identified HPMF and its

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“…Raw CNTs were refluxed in HNO 3 (68 wt. %) for 14 h at 140˝C in an oil bath; then the mixture was filtered and washed with deionized water, followed by drying at 60˝C for 12 h.) at 298 K for 6 h, then dried overnight at 393 K, and calcined at 673 K for 4 h. An aqueous solution of ammonium perrhenate (NH 4 …”

Section: Catalyst Preparationmentioning

confidence: 99%

“…The reaction products were analyzed by gas chromatography GC-2014CPF/SPL (Shimadzu Co., Kyoto, Japan) equipped with a flame ionization detector (60 mˆ0.25 mm, DB-1 column, Agilent Technologies Inc., Palo Alto, IA, USA) and GC-2014 (Shimadzu Co., Kyoto, Japan) with a thermal conductivity detector (Porapak T column, Waters Corporation, Milford, MA, USA). GC-4000A (TDX-01 column, East & West Analytical Instruments, Inc., Beijing, China) with thermal conductivity detectors was used to analyze H 2 , CO, CO 2 and CH 4 .…”

Section: Catalytic Oxidation Of Dmementioning

confidence: 99%

“…Utilizing oxidation of DME to synthesize DMM x is one of the most attractive green routes for the synthesis of clean fuel additives with a short process, low CO 2 emissions and high energy efficiency. DME oxidation has been paid more and more attention due to the advantages of simplicity and feasibility [3][4][5][6][7][8]. Yagita Hirosh et al examined DME oxidation to 1,2-dimethoxyethane (DMET) over a SnO 2 /MgO catalyst [9].…”

Section: Introductionmentioning

confidence: 99%

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Low-Temperature Oxidation of Dimethyl Ether to Polyoxymethylene Dimethyl Ethers over CNT-Supported Rhenium Catalyst

et al. 2016

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Due to its excellent conductivity, good thermal stability and large specific surface area, carbon nano-tubes (CNTs) were selected as support to prepare a Re-based catalyst for dimethyl ether (DME) direct oxidation to polyoxymethylene dimethyl ethers (DMM x ). The catalyst performance was tested in a continuous flow type fixed-bed reactor. H 3 PW 12 O 40 (PW 12 ) was used to modify Re/CNTs to improve its activity and selectivity. The effects of PW 12 content, reaction temperature, gas hourly space velocity (GHSV) and reaction time on DME oxidation to DMM x were investigated. The results showed that modification of CNT-supported Re with 30% PW 12 significantly increased the selectivity of DMM and DMM 2 up to 59.0% from 6.6% with a DME conversion of 8.9%; besides that, there was no CO x production observed in the reaction under the optimum conditions of 513 K and 1800 h´1. The techniques of XRD, BET, NH 3 -TPD, H 2 -TPR, XPS, TEM and SEM were used to characterize the structure, surface properties and morphology of the catalysts. The optimum amount of weak acid sites and redox sites promotes the synthesis of DMM and DMM 2 from DME direct oxidation.

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Measurements of H2O2 in low temperature dimethyl ether oxidation

Cited by 71 publications

References 17 publications

An ignition delay and kinetic modeling study of methane, dimethyl ether, and their mixtures at high pressures

An ignition delay and kinetic modeling study of methane, dimethyl ether, and their mixtures at high pressures

Detection and Identification of the Keto-Hydroperoxide (HOOCH₂OCHO) and Other Intermediates during Low-Temperature Oxidation of Dimethyl Ether

Low-Temperature Oxidation of Dimethyl Ether to Polyoxymethylene Dimethyl Ethers over CNT-Supported Rhenium Catalyst

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Measurements of H2O2 in low temperature dimethyl ether oxidation

Cited by 71 publications

References 17 publications

An ignition delay and kinetic modeling study of methane, dimethyl ether, and their mixtures at high pressures

An ignition delay and kinetic modeling study of methane, dimethyl ether, and their mixtures at high pressures

Detection and Identification of the Keto-Hydroperoxide (HOOCH2OCHO) and Other Intermediates during Low-Temperature Oxidation of Dimethyl Ether

Low-Temperature Oxidation of Dimethyl Ether to Polyoxymethylene Dimethyl Ethers over CNT-Supported Rhenium Catalyst

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Detection and Identification of the Keto-Hydroperoxide (HOOCH₂OCHO) and Other Intermediates during Low-Temperature Oxidation of Dimethyl Ether