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Selective catalytic oxidation of geraniol to citral with molecular oxygen in supercritical carbon dioxide ☆

Paper ID Volume ID Publish Year Pages File Format Full-Text
41482 45890 2011 6 PDF Available
Title
Selective catalytic oxidation of geraniol to citral with molecular oxygen in supercritical carbon dioxide ☆
Abstract

Selective catalytic oxidation of geraniol to citral with molecular oxygen in supercritical carbon dioxide (scCO2) has been investigated. The catalyst used was a chromium containing mesoporous molecular sieve catalyst viz. CrMCM-41. Comparison studies were performed with CoMCM-41, PtMCM-41 and PdMCM-41 catalysts. Among the various catalysts studied, CrMCM-41 showed a high conversion of geraniol and an excellent selectivity for citral. In contrast CoMCM-41, PtMCM-41 and PdMCM-41 catalysts exhibited low conversion of geraniol. However all three catalysts compared showed similar citral selectivity to CrMCM-41. The effect of CO2 pressure and reaction temperature geraniol oxidation was studied with CrMCM-41. Supercritical CO2 medium was found to enhance the conversion of geraniol and/or yield of citral. It was noticed that the catalyst can be recycled with negligible loss of conversion.

Graphical abstractCrMCM-41 catalyst gave a good conversion of geraniol (X = 53%) and high selectivity of citral (S = 98%) in scCO2 media at 80 °C for 6 h.Figure optionsDownload full-size imageDownload high-quality image (111 K)Download as PowerPoint slideResearch highlights▶ CrMCM-41 gave high selectivity (98%) and good yield (52%) of citral in scCO2. ▶ Conversion of geraniol is enhanced in scCO2. ▶ Activity of CrMCM-41 is higher than PtMCM-41 and PdMCM-41.

Keywords
Selective oxidation; Geraniol; Citral; Molecular oxygen; Supercritical carbon dioxide; Heterogeneous catalyst
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Selective catalytic oxidation of geraniol to citral with molecular oxygen in supercritical carbon dioxide ☆
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 394, Issues 1–2, 28 February 2011, Pages 209–214
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