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Issue 2, 2015
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Catalytic oxygen activation versus autoxidation for industrial applications: a physicochemical approach

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Abstract

The activation and use of oxygen for the oxidation and functionalization of organic substrates are among the most important reactions in a chemist's toolbox. Nevertheless, despite the vast literature on catalytic oxidation, the phenomenon of autoxidation, an ever-present background reaction that occurs in virtually every oxidation process, is often neglected. In contrast, autoxidation can affect the selectivity to a desired product, to those dictated by pure free-radical chain pathways, thus affecting the activity of any catalyst used to carry out a reaction. This critical review compares catalytic oxidation routes by transition metals versus autoxidation, particularly focusing on the industrial context, where highly selective and “green” processes are needed. Furthermore, the application of useful tests to discriminate between different oxygen activation routes, especially in the area of hydrocarbon oxidation, with the aim of an enhanced catalyst design, is described and discussed. In fact, one of the major targets of selective oxidation is the use of molecular oxygen as the ultimate oxidant, combined with the development of catalysts capable of performing the catalytic cycle in a real energy and cost effective manner on a large scale. To achieve this goal, insights from metallo-proteins that could find application in some areas of industrial catalysis are presented, as well as considering the physicochemical principles that are fundamental to oxidation and autoxidation processes.

Graphical abstract: Catalytic oxygen activation versus autoxidation for industrial applications: a physicochemical approach

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Article information


Submitted
10 Aug 2014
Accepted
18 Sep 2014
First published
26 Sep 2014

Phys. Chem. Chem. Phys., 2015,17, 715-731
Article type
Perspective
Author version available

Catalytic oxygen activation versus autoxidation for industrial applications: a physicochemical approach

X. Liu, Y. Ryabenkova and M. Conte, Phys. Chem. Chem. Phys., 2015, 17, 715
DOI: 10.1039/C4CP03568B

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