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Effect of acidity of ZSM-5 zeolite on conversion of ethanol to propylene

Paper ID Volume ID Publish Year Pages File Format Full-Text
41453 45889 2011 6 PDF Available
Title
Effect of acidity of ZSM-5 zeolite on conversion of ethanol to propylene
Abstract

Protonated ZSM-5 zeolites (HZSM-5(M), M = Al, Ga, and Fe) having different acid strengths were prepared under various synthesis conditions, and the effect of acidity of the ZSM-5 zeolite on the conversion of ethanol to propylene was investigated in detail. HZSM-5(Ga) and HZSM-5(Al) showed high propylene yields. However, HZSM-5(Fe) yielded ethylene instead of propylene, i.e., only dehydration of ethanol occurred on HZSM-5(Fe). These results indicate that the acid strength is a crucial factor for the selective production of propylene. In other words, for successful selective conversion of ethanol to propylene, HZSM-5(M) zeolites must contain acid sites with an acid strength that is more than that of HZSM-5(Ga). It was also found that phosphorous-modified HZSM-5(Ga) zeolite exhibited an improved propylene yield relative to the unmodified zeolite and that the modification considerably enhanced the catalytic stability because of the suppression of both elimination of framework gallium and coke deposition.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (91 K)Download as PowerPoint slideHighlights► HZSM-5(M) (M = Al, Ga, and Fe) zeolites having different acid strengths were prepared. ► High propylene yields were obtained over HZSM-5(Ga) and HZSM-5(Al). ► P-modification was effective for improving the catalytic performance of HZSM-5(Ga).

Keywords
Ethanol; ZSM-5; Propylene; Acidity; Phosphorous
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Effect of acidity of ZSM-5 zeolite on conversion of ethanol to propylene
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 399, Issues 1–2, 31 May 2011, Pages 262–267
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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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