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Zn(II)–Cr(III) mixed oxide as efficient bifunctional catalyst for dehydroisomerisation of α-pinene to p-cymene

Paper ID Volume ID Publish Year Pages File Format Full-Text
42320 45920 2009 4 PDF Available
Title
Zn(II)–Cr(III) mixed oxide as efficient bifunctional catalyst for dehydroisomerisation of α-pinene to p-cymene
Abstract

Zn(II)–Cr(III) mixed oxide possessing acid and dehydrogenation functions is an efficient, noble-metal-free catalyst for the one-step dehydroisomerisation of α-pinene to p-cymene. This reaction is a good example of the use of heterogeneous multifunctional catalysis for the conversion of renewable feedstock into value-added chemicals. It involves acid-catalysed α-pinene isomerisation followed by dehydrogenation of p-cymene precursor(s). The reaction is carried out over a fixed catalyst bed in the gas phase at 350 °C. Amongst Zn–Cr oxides studied (Zn/Cr = 20:1–1:30), the preferred catalyst is Zn–Cr (1:1) oxide which produces p-cymene with a 78% yield at 100% α-pinene conversion. This catalyst shows stable performance for over 30 h without co-feeding hydrogen to the reactor.

Graphical abstractZn(II)–Cr(III) mixed oxide possessing acid and dehydrogenation functions catalyses one-step dehydroisomerisation of α-pinene to yield 78% of p-cymene in the gas phase process. The catalyst shows stable performance for over 30 h without co-feeding hydrogen.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
α-Pinene; p-Cymene; Zn–Cr mixed oxide; Bifunctional catalysis
First Page Preview
Zn(II)–Cr(III) mixed oxide as efficient bifunctional catalyst for dehydroisomerisation of α-pinene to p-cymene
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 363, Issues 1–2, 1 July 2009, Pages 153–156
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis