The catalysis of oxygen scavenging reactions can be placed in two categories, 1) those depending on a free radical chain mechanism and 2) those in which a catalytic intermediate redox cycle is involved.

Sulfite scavenging exemplifies the first category as the free radical chain mechanism is the only one effective in this system. This mechanism makes the sulfite system susceptible to a great variety of inhibiting effects. However, mechanistic understanding is available to solve such problems.

Hydrazine can provide examples in each category. Catalysis via the hydroquinone/quinone cycle exemplifies the intermediate redox approach and, at high temperature, hydrazine appears to cleave rapidly enough to provide its own free radical chain initiation.

Subject
Materials, Ions, Hydrazine, Scavenging, Catalysis, Sulfites, Acidity, Metals, Oxygen, Cations, Catalysts, Chemical reactions, Oxidation
© 1986 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
1986
Association for Materials Protection and Performance (AMPP)
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