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One-pot synthesis of olefins from aromatic ketones via tandem consecutive hydrogenation–dehydration reactions

Paper ID Volume ID Publish Year Pages File Format Full-Text
55702 47062 2011 6 PDF Available
Title
One-pot synthesis of olefins from aromatic ketones via tandem consecutive hydrogenation–dehydration reactions
Abstract

In this work, the synthesis of aromatic olefins from the corresponding ketones via tandem consecutive hydrogenation–dehydration reactions was studied. The conversion of acetophenone (AP) to styrene (STY) was used as model reaction. Initially, the liquid-phase hydrogenation of AP to 1-phenylethanol (PHE), using cyclohexane as solvent, was investigated at 363 K and 10 bar over Ni, Co, Cu, Pd and Pt supported on SiO2. Cu/SiO2 was the most selective catalyst yielding 100% PHE. Then, the consecutive dehydration of PHE to STY was studied at 363 K and 2 bar over mesoporous solid acids (Al2O3, SiO2–Al2O3, Al-MCM-41, HPA/SiO2) and acid zeolites (HY, HBEA, HZSM-5). Zeolite HZSM-5 was the most selective catalyst, yielding 96% STY. On the basis of the former results, a mixture of Cu/SiO2 and HZSM-5 was used to investigate the feasibility of performing the one-pot synthesis of STY from AP, by promoting tandem consecutive AP hydrogenation–PHE dehydration reactions. A maximum STY selectivity of about 72% was achieved in a two-step catalytic run: the first step was carried out at 323 K and 20 bar and the second step at 353 K and 1 bar.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (356 K)Download as PowerPoint slideHighlights► The one-pot conversion of aromatic ketones to olefins is promoted on solid catalysts. ► Selective synthesis of styrene from acetophenone is achieved via tandem reactions. ► Consecutive hydrogenation–dehydration is catalyzed using a Cu/SiO2–HZSM-5 mixture. ► High styrene yields are obtained by changing the operative conditions of two-step run. ► Proper catalysts and conditions are selected by studying each step separately.

Keywords
One-pot synthesis; Tandem reactions; Hydrogenation–dehydration; Ketones; Aromatic olefins
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One-pot synthesis of olefins from aromatic ketones via tandem consecutive hydrogenation–dehydration reactions
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 172, Issue 1, 25 August 2011, Pages 171–176
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
Online Support
Any Questions? feel free to contact us