Oxidation of oxymethylene ether (OME0−5): An experimental systematic study by mass spectrometry and photoelectron photoion coincidence spectroscopy

Investigation of the combustion chemistry in laminar, low-pressure oxymethylene ether flames (OME0–4)

“…Longer OMEs are therefore decompose at lower temperatures and therefore closer to the burner surface. A comparable behavior for long-chain OMEs was observed in atmospheric laminar flow reactor experiments demonstrating that shorter chain lengths correlates with higher temperatures [55] needed for total oxidation. This finding is in line with the cetane numbers (CN) of OME1-3, which increase from 26 for OME1 up to 78 for OME3 [56].…”

“…For the neat OME4, the best fit shows a ratio of 66 % ethanol to 33 % DME. Having a higher mole fraction for Acetaldehyde + Ethenol-Sim ethanol compared to DME was already observed in atmospheric, laminar reactor measurements for pure OME1-5 [55]. For the OME1/H2, the ratio of DME account for 98 % compared to ethanol.…”

“…6. [55]. This is likely due to the increased importance of the formation route CH3OCH2 + H2 = CH3OCH3 + H at the H2 rich base flame.…”

Gaseous emissions of a heavy-duty engine fueled with polyoxymethylene dimethyl ethers (OME) in transient cold-start operation and methods for after-treatment system heating

“…Gaiser et al observed high concentrations of ethanol during OME combustion, as well as acetaldehyde and methyl formate. 56 The FT-IR used in this work did not include this species in the specific method, so further investigations regarding the products of incomplete OME combustion in addition to CH 4 , CH 3 OH, CH 2 O, CH 2 O 2 , and OME 0–6 will be necessary.…”

Dimethyl ether (DME) and dimethoxymethane (DMM) as reaction enhancers for methane: Combining flame experiments with model-assisted exploration of a polygeneration process

“…(methoxyethane), and the two radicals CH3 (methyl) and C3H3 (propargyl) for both the DME and DMM flame series, as well as C2H6O (calibrated as DME, although some presence of its isomer ethanol may not be ruled out [88]) and an unspecified species C4H9O2 that were additionally detected as intermediates in the DMM flames. Assignment of these species are consistent with previous measurements and/or pertinent modeling studies on DME and DMM flames [37-40, 83-85, 87, 89, 90].…”