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In situ Fourier transform infrared spectroscopic studies of limonene epoxidation over PW-Amberlite

Paper ID Volume ID Publish Year Pages File Format Full-Text
42605 45933 2009 6 PDF Available
Title
In situ Fourier transform infrared spectroscopic studies of limonene epoxidation over PW-Amberlite
Abstract

In situ attenuated total reflection infrared spectroscopy (ATR-IR) in the liquid phase and in situ transmission IR spectroscopy in the gas phase were used to validate a previously proposed mechanism for limonene epoxidation with aqueous hydrogen peroxide on PW-Amberlite. Catalyst activation by the oxidant was evidenced by ATR-IR through the presence of multiple bands in the 1220–910 cm−1 range, which are attributed to metal-oxygen interactions on the catalytic surface. The presence of reaction intermediates is linked to bands in the 840–820 cm−1 region. Gas phase experiments indicate that acetonitrile is easily adsorbed and desorbed from the catalyst, while limonene is adsorbed on the solvent or oxidant saturated PW-Amberlite and not on the fresh catalyst, as proposed in the mechanistic pathway.

Graphical abstractIn situ attenuated total reflection infrared spectroscopy (ATR-IR) in the liquid phase and in situ transmission IR spectroscopy in the gas phase were used to validate a previously proposed mechanism for limonene epoxidation with aqueous hydrogen peroxide over PW-Amberlite. Catalyst activation by the oxidant and the presence of reaction intermediates was evidenced by ATR-IR. Acetonitrile and limonene adsorption was determined by gas phase experiments.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
In situ IR; ATR infrared spectroscopy; Limonene epoxidation; PW-Amberlite
First Page Preview
In situ Fourier transform infrared spectroscopic studies of limonene epoxidation over PW-Amberlite
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 365, Issue 1, 15 August 2009, Pages 42–47
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis