Dehydrogenation of ethane to ethylene via radical pathways enhanced by alkali metal based catalyst in oxysteam condition

Handle URI:
http://hdl.handle.net/10754/622060
Title:
Dehydrogenation of ethane to ethylene via radical pathways enhanced by alkali metal based catalyst in oxysteam condition
Authors:
Takanabe, Kazuhiro ( 0000-0001-5374-9451 ) ; Shahid, Salman
Abstract:
The dehydrogenation of ethane to ethylene in the presence of oxygen and water was conducted using Na2WO4/SiO2 catalyst at high temperatures. At 923 K, the conversion rate without water was proportional to ethane pressure and a half order of oxygen pressure, consistent with a kinetically relevant step where an ethane molecule is activated with dissociated oxygen on the surface. When water was present, the ethane conversion rate was drastically enhanced. An additional term in the rate expression was proportional to a quarter of the oxygen pressure and a half order of the water pressure. This mechanism is consistent with the quasi-equilibrated OH radical formation with subsequent ethane activation. The attainable yield can be accurately described by taking the water contribution into consideration. At high conversion levels at 1073 K, the C2H4 yield exceeded 60% in a single-pass conversion. The C2H4 selectivity was almost insensitive to the C2H6 and O2 pressures. © 2016 American Institute of Chemical Engineers.
KAUST Department:
KAUST Catalysis Center (KCC); Physical Sciences and Engineering (PSE) Division
Citation:
Takanabe K, Shahid S (2016) Dehydrogenation of ethane to ethylene via radical pathways enhanced by alkali metal based catalyst in oxysteam condition. AIChE Journal 63: 105–110. Available: http://dx.doi.org/10.1002/aic.15447.
Publisher:
Wiley-Blackwell
Journal:
AIChE Journal
Issue Date:
21-Aug-2016
DOI:
10.1002/aic.15447
Type:
Article
ISSN:
0001-1541
Sponsors:
The research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST).
Additional Links:
http://onlinelibrary.wiley.com/doi/10.1002/aic.15447/full
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; KAUST Catalysis Center (KCC)

Full metadata record

DC FieldValue Language
dc.contributor.authorTakanabe, Kazuhiroen
dc.contributor.authorShahid, Salmanen
dc.date.accessioned2016-12-22T13:34:56Z-
dc.date.available2016-12-22T13:34:56Z-
dc.date.issued2016-08-21en
dc.identifier.citationTakanabe K, Shahid S (2016) Dehydrogenation of ethane to ethylene via radical pathways enhanced by alkali metal based catalyst in oxysteam condition. AIChE Journal 63: 105–110. Available: http://dx.doi.org/10.1002/aic.15447.en
dc.identifier.issn0001-1541en
dc.identifier.doi10.1002/aic.15447en
dc.identifier.urihttp://hdl.handle.net/10754/622060-
dc.description.abstractThe dehydrogenation of ethane to ethylene in the presence of oxygen and water was conducted using Na2WO4/SiO2 catalyst at high temperatures. At 923 K, the conversion rate without water was proportional to ethane pressure and a half order of oxygen pressure, consistent with a kinetically relevant step where an ethane molecule is activated with dissociated oxygen on the surface. When water was present, the ethane conversion rate was drastically enhanced. An additional term in the rate expression was proportional to a quarter of the oxygen pressure and a half order of the water pressure. This mechanism is consistent with the quasi-equilibrated OH radical formation with subsequent ethane activation. The attainable yield can be accurately described by taking the water contribution into consideration. At high conversion levels at 1073 K, the C2H4 yield exceeded 60% in a single-pass conversion. The C2H4 selectivity was almost insensitive to the C2H6 and O2 pressures. © 2016 American Institute of Chemical Engineers.en
dc.description.sponsorshipThe research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST).en
dc.publisherWiley-Blackwellen
dc.relation.urlhttp://onlinelibrary.wiley.com/doi/10.1002/aic.15447/fullen
dc.rightsThis is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.en
dc.subjectCatalysisen
dc.subjectHydrocarbon processingen
dc.subjectReaction kineticsen
dc.titleDehydrogenation of ethane to ethylene via radical pathways enhanced by alkali metal based catalyst in oxysteam conditionen
dc.typeArticleen
dc.contributor.departmentKAUST Catalysis Center (KCC)en
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalAIChE Journalen
dc.eprint.versionPublisher's Version/PDFen
kaust.authorTakanabe, Kazuhiroen
kaust.authorShahid, Salmanen
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