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Dehydrogenation of ethane to ethylene over a highly efficient Ga2O3/HZSM-5 catalyst in the presence of CO2

Paper ID Volume ID Publish Year Pages File Format Full-Text
42542 45930 2009 6 PDF Available
Title
Dehydrogenation of ethane to ethylene over a highly efficient Ga2O3/HZSM-5 catalyst in the presence of CO2
Abstract

Dehydrogenation of ethane to ethylene in the presence of carbon dioxide was investigated over various gallium-based catalysts. Ga2O3/HZSM-5 catalysts show better stability than β-Ga2O3, and the higher Si/Al ratio HZSM-5 supported gallium oxide catalysts are more resistant to deactivation. The Ga2O3/HZSM-5(97) catalyst exhibits both high activity and stability for dehydrogenation of ethane, with an ethane conversion of 15% and ethylene selectivity of 94% without any observable trend of deactivation in 70 h. The results of NH3-TPD and FT-IR spectra of adsorbed pyridine revealed that the enhancement of the catalyst stability with increasing Si/Al ratio of the support is caused by the decrease of the acidity of the catalysts, resulting in the suppression of the side reactions, such as cracking and oligomerization. The promoting effect of CO2 on the dehydrogenation reaction is attributed to the reverse water gas shift reaction. The catalyst stability is also enhanced by the introduction of CO2.

Graphical abstractDehydrogenation of ethane to ethylene over Ga2O3/HZSM-5 catalysts in the presence of CO2 was investigated. High activity and stability were achieved on the Ga2O3/HZSM-5(97) catalyst with a yield of 14% without any observable trend of deactivation in 70 h. The enhancement of the stability with increasing Si/Al ratio of the support is caused by the decrease of the catalyst acidity.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Dehydrogenation; Ethane; Ga2O3/HZSM-5; Stability; Carbon dioxide
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Dehydrogenation of ethane to ethylene over a highly efficient Ga2O3/HZSM-5 catalyst in the presence of CO2
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 356, Issue 2, 15 March 2009, Pages 148–153
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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Price after discount Only $4.95
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