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Catalytic conversion of limonene over acid activated Serra de Dentro (SD) bentonite

Paper ID Volume ID Publish Year Pages File Format Full-Text
44073 46002 2007 13 PDF Available
Title
Catalytic conversion of limonene over acid activated Serra de Dentro (SD) bentonite
Abstract

A series of acid-activated clay catalysts were prepared from a purified bentonite, rich in structural iron, collected at Serra de Dentro on the island of Porto Santo. The purified bentonite exhibited a surface area of 130 m2 g−1 which increased to values as high as 500 m2 g−1 following activation with 4M HCl at 95 °C for 30 min (SD-4M-95-30). The ability of the activated samples to convert limonene to p-cymene was evaluated using a reaction time of 15 min at 80 °C. The sample prepared using 3M HCl at 95 °C for 30 min (SD-3M-95-30) offered the optimum combination of surface area (470 m2 g−1) and acidity (0.26 mmol g−1) and 95% of the limonene was converted to product. About 15% of the product mixture was p-cymene whilst non-volatile products and polymeric species made up 54% of the product mixture. The presence of iron in the octahedral sheet of the SD bentonite appears responsible for the dehydrogenation activity. TG–MS analysis of acid activated samples, saturated with cyclohexylamine, reflected the dehydrogenation capabilities of the catalysts in that SD-3M-95-30 produced the most benzene and aniline as decomposition/transformation products.

Graphical abstractA series of acid-activated clay catalysts were prepared from a purified bentonite, rich in structural iron, collected at Serra de Dentro on the island of Porto Santo. The ability of the activated samples to convert limonene to p-cymene was evaluated. TG–MS analysis of acid activated samples, saturated with cyclohexylamine, reflected the dehydrogenation capabilities of the catalysts. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Acid activated clays; Acidity; Catalysis; Limonene; p-Cymene
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Catalytic conversion of limonene over acid activated Serra de Dentro (SD) bentonite
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 318, 20 February 2007, Pages 108–120
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
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Any Questions? feel free to contact us