Dehydrogenation of ethane to ethylene via radical pathways enhanced by alkali metal based catalyst in oxysteam condition
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ArticleAuthors
Takanabe, Kazuhiro
Shahid, Salman
KAUST Department
Catalysis for Energy Conversion (CatEC)Chemical Science Program
KAUST Catalysis Center (KCC)
Physical Science and Engineering (PSE) Division
Date
2016-08-21Online Publication Date
2016-08-21Print Publication Date
2017-01Permanent link to this record
http://hdl.handle.net/10754/622060
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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.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.Sponsors
The research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST).Publisher
WileyJournal
AIChE JournalAdditional Links
http://onlinelibrary.wiley.com/doi/10.1002/aic.15447/fullae974a485f413a2113503eed53cd6c53
10.1002/aic.15447