Direct conversion of methane in formaldehyde at very short residence time

To obtain new kinetic data, a quartz annular flow microreactor was chosen for the experimental investigation of the gas phase partial methane oxidation to formaldehyde under high temperature (1173–1273 K) and short residence time (20–60 ms). High formaldehyde selectivity (up to 80%) is achieved, but...

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Bibliographic Details
Published in:Chemical engineering science 2011-12, Vol.66 (24), p.6331-6340
Main Authors: Zhang, J., Burklé-Vitzthum, V., Marquaire, P.M., Wild, G., Commenge, J.M.
Format: Article
Language:English
Subjects:
Annular flow
Annular microstructure
Applied sciences
Chemical engineering
Chemical Physics
Chemical reactors
Exact sciences and technology
Formaldehyde
Gases
Kinetics
Methane
Methane oxidation
Oxidation
Physics
quartz
Radicals
Reaction kinetics
Reactors
Short residence time
Simulation
temperature
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Summary:To obtain new kinetic data, a quartz annular flow microreactor was chosen for the experimental investigation of the gas phase partial methane oxidation to formaldehyde under high temperature (1173–1273 K) and short residence time (20–60 ms). High formaldehyde selectivity (up to 80%) is achieved, but the yield remains low. For a single pass operation, the best HCHO experimental yield is 2.4%. The kinetic simulation using GRI-Mech 3.0 shows an overall good agreement with the experimental data, though there does exist some discrepancies for some conditions. The general pathways of the reaction show that HCHO is formed mainly from direct oxidation of methyl radical CH 3 by O 2, and partly from dehydrogenation or oxidation of methoxy radical CH 3O.
ISSN:0009-2509
1873-4405
DOI:10.1016/j.ces.2011.03.059