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Molybdenum oxide modified HZSM-5 catalyst: Surface acidity and catalytic performance for the dehydration of aqueous ethanol

Paper ID Volume ID Publish Year Pages File Format Full-Text
41674 45896 2011 6 PDF Available
Title
Molybdenum oxide modified HZSM-5 catalyst: Surface acidity and catalytic performance for the dehydration of aqueous ethanol
Abstract

The catalytic dehydration of ethanol into ethylene was studied over 5 wt% Mo/HZSM-5 prepared by impregnation. The effect of calcination temperature on the structure, acidity and catalytic performance of the catalysts was investigated by XRD, N2 adsorption, NH3-TPD and TG. A correlation between the catalytic performance of Mo modified catalysts and the amount of weak and medium acidity was observed. It was found that 5 wt% Mo/HZSM-5 catalyst calcined at 500 °C exhibited the highest weak and medium acidity and much better catalytic performance in ethanol dehydration reaction compared with HZSM-5. TPR characterization showed that the Mo species on the external surface of HZSM-5 was easier to be reduced during the reaction. Combining quantitative analyses of NH3-TPD and H2-TPR profiles of fresh and used catalysts revealed that the decrease of weak and medium acidity could be correlated with the reduction of Mo species. It is proposed that reduction of Mo species caused the decrease of weak and medium acidity, which contributed to activity drop at the initial reaction stage.

Graphical abstract.Figure optionsDownload full-size imageDownload high-quality image (179 K)Download as PowerPoint slideResearch highlights► 5 wt% Mo modified HZSM-5 calcined at 500 °C exhibited much better catalytic performance and anti-coking ability in ethanol dehydration reaction compared with HZSM-5. ► A correlation between the catalytic performance of Mo modified catalysts and the amount of weak and medium acidity was observed. ► The decrease of weak and medium acidity could be correlated with the reduction of Mo species.

Keywords
Ethanol dehydration; Mo/HZSM-5; Calcination temperature; Acidity; Reduction
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Molybdenum oxide modified HZSM-5 catalyst: Surface acidity and catalytic performance for the dehydration of aqueous ethanol
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 396, Issues 1–2, 15 April 2011, Pages 8–13
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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Any Questions? feel free to contact us