The reaction kinetics of dimethyl ether. I: High-temperature pyrolysis andoxidation in flow reactors

Citation
Sl. Fischer et al., The reaction kinetics of dimethyl ether. I: High-temperature pyrolysis andoxidation in flow reactors, INT J CH K, 32(12), 2000, pp. 713-740
Citations number
132
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
INTERNATIONAL JOURNAL OF CHEMICAL KINETICS
ISSN journal
05388066 → ACNP
Volume
32
Issue
12
Year of publication
2000
Pages
713 - 740
Database
ISI
SICI code
0538-8066(200012)32:12<713:TRKODE>2.0.ZU;2-C
Abstract
Dimethyl ether reaction kinetics at high temperature were studied in two di fferent flow reactors under highly dilute conditions. Pyrolysis of dimethyl ether was studied in a variable-pressure now reactor at 2.5 atm and 1118 K . Studies were also conducted in an atmospheric pressure flow reactor at ab out 1085 K. These experiments included trace-oxygen-assisted pyrolysis, as well as full oxidation experiments, with the equivalence ratio (phi) varyin g From 0.32 less than or equal to phi less than or equal to 3.4. On-line, c ontinuous, extractive sampling in conjunction with Fourier Transform infra- Red, Non-Dispersive Infra-Red (for CO and CO2) and electrochemical (for O-2 ) analyses were performed to quantify species at specific locations along t he axis of the turbulent flow reactors. Species concentrations were correla ted against residence time in the reactor and species evolution profiles we re compared to the predictions of a previously published detailed kinetic m echanism. Some changes were made to the model in order to improve agreement with the present experimental data. However, the revised model continues t o reproduce previously reported high-temperature jet-stirred reactor and sh ock tube results. (C) 2000 John Wiley & Sons, Inc.