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Transformation of α-limonene into p-cymene over oxide catalysts: A green chemistry approach

Paper ID Volume ID Publish Year Pages File Format Full-Text
39943 45840 2014 6 PDF Available
Title
Transformation of α-limonene into p-cymene over oxide catalysts: A green chemistry approach
Abstract

•Anatase is very active for selective transformation of α-limonene to p-cymene.•Its high performance is due to a good “surface acidity/reducibility” balance.•This high surface area oxide is also a very stable catalyst.•90% yield of p-cymene is obtained over TiO2 catalyst at 300 °C and inert atmosphere.

The transformation of α-limonene into p-cymene over oxide catalysts (γ-Al2O3, TiO2, SiO2, MCM-41) has been studied under H2 and He atmosphere in the temperature range 200–300 °C using a fixed bed micro-reactor working under atmospheric pressure. The catalysts were characterized using various physicochemical techniques (N2 adsorption–desorption, NH3-TPD, XRD, TPR, HR-TEM).We demonstrated that an almost complete transformation of α-limonene into p-cymene can be obtained at 300 °C over a high surface area anatase (Alfa Aesar) in helium atmosphere. The high surface area titania was also proved a very stable catalyst. The high catalytic performance of this oxide could be attributed to a good balance between the acidity and surface reducibility exhibited by this material. The aforementioned properties are, respectively, relevant to the isomerization and disproportionation/dehydrogenation steps involved in the mechanism of title reaction. Based on the yields obtained for p-cymene and by-products we proposed a mechanistic scheme for the title reaction over the high surface area titania.

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Keywords
p-Cymene; α-Limonene; High surface area titania; Oxide catalysts; Acidity; Reducibility
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Transformation of α-limonene into p-cymene over oxide catalysts: A green chemistry approach
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 474, 22 March 2014, Pages 224–229
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
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Full-text PDF Download
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