Bromine mediated partial oxidation of ethane over nanostructured zirconia supported metal oxide/bromide

Yilmaz, Aysen, Zhou, Xiao-Ping, Lorkovic, Ivan M., Yilmaz, Gurkan A., Laverman, Leroy, Weiss, Mike, Sun, Shouli, Schaefer, Dieter, Sherman, Jeffrey H., McFarland, Eric W., Ford, Peter C. and Stucky, Galen D. (2005) Bromine mediated partial oxidation of ethane over nanostructured zirconia supported metal oxide/bromide. Microporous and Mesoporous Materials, 79 1-3: 205-214. doi:10.1016/j.micromeso.2004.11.003


Author Yilmaz, Aysen
Zhou, Xiao-Ping
Lorkovic, Ivan M.
Yilmaz, Gurkan A.
Laverman, Leroy
Weiss, Mike
Sun, Shouli
Schaefer, Dieter
Sherman, Jeffrey H.
McFarland, Eric W.
Ford, Peter C.
Stucky, Galen D.
Title Bromine mediated partial oxidation of ethane over nanostructured zirconia supported metal oxide/bromide
Journal name Microporous and Mesoporous Materials   Check publisher's open access policy
ISSN 1387-1811
1873-3093
Publication date 2005-04-01
Sub-type Article (original research)
DOI 10.1016/j.micromeso.2004.11.003
Open Access Status Not yet assessed
Volume 79
Issue 1-3
Start page 205
End page 214
Total pages 10
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Language eng
Abstract Partial oxidation of ethane to an array of products was achieved through use of bromine/supported metal bromide as redox mediator for oxygen activation. In a two stage flowing fixed bed reactor, ethane bromination (350-450 °C) to EtBr and HBr was followed by metathesis of these intermediates with supported cobalt or copper oxides (200-250 °C) to produce ethanol (up to 64% selectivity at 45% EtBr conversion), diethyl ether (64% selectivity at 44% conversion), and ethylene (26% selectivity at 68% conversion at 200 °C, but conversions and selectivities approaching 100% at temperatures >300 °C) as major products, and butadiene, vinyl bromide, acetaldehyde, ethyl acetate, and acetone as minor products. The supported cobalt and copper bromides thus formed were reoxidized with flowing O2 to liberate bromine and this cycle was repeated at least three (and as many as fifty) times to establish the reproducibility of both the metathesis product distribution and of the oxide delivery and bromide sequestration capacity of the metal oxide/metal bromide mediators. Different formulations of the supported and unsupported metal oxide/metal bromide were investigated; zirconia or titania-supported Cu and Co oxides prepared from oxalic acid gels showed higher and more reproducible oxide/bromide exchange activity and capacity. These materials' performance is discussed in terms of their morphology, crystallinity, and porosity at different states of bromination in the partial oxidation cycle.
Keyword Bromine mediated
Ethane
Ethanol derivatives
Partial oxidation
Solid reactant
Supported metal oxide
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Chemical Engineering Publications
 
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