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Catalytic oxidation of reduced sulfur compounds by homogeneous and heterogeneous Co(II) phthalocyanine complexes

Hoffmann, Michael R. and Hong, Andrew P. K. (1987) Catalytic oxidation of reduced sulfur compounds by homogeneous and heterogeneous Co(II) phthalocyanine complexes. Science of the Total Environment, 64 (1-2). pp. 99-115. ISSN 0048-9697. https://resolver.caltech.edu/CaltechAUTHORS:20150817-150959084

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Abstract

An overview of the kinetics and mechanisms of the reactions of reduced sulfur compounds and other reductants with molecular oxygen as catalyzed by homogeneous and heterogeneous metal phthalocyanine complexes is presented. Catalysis of the autoxidation of S(IV) by Co(II) tetrasulfophthalocyanine was characterized in terms of an ordered ternary-complex mechanism in which S(IV) and oxygen are simultaneously bound to the Co(II)/Co(III) metal center. Hydrogen peroxide was identified as an intermediate reduction product of bound dioxygen. The reaction was examined by spectrophotometric and EPR methods and was found to proceed via a sulfito-cobalt(III)-superoxide complex that subsequently combines with a second sulfite molecule to produce sulfate and a sulfito-cobalt(III)-peroxide. The catalytic cycle is closed by the regeneration of the cobalt(II) complex via the production of H_2O_2. Direct evidence for he active sulfito-cobalt(III)-superoxide intermediate was obtained.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/0048-9697(87)90125-2DOIArticle
http://www.sciencedirect.com/science/article/pii/0048969787901252PublisherArticle
ORCID:
AuthorORCID
Hoffmann, Michael R.0000-0001-6495-1946
Additional Information:© 1987 Elsevier.
Issue or Number:1-2
Record Number:CaltechAUTHORS:20150817-150959084
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150817-150959084
Official Citation:Michael R. Hoffmann, Andrew P.K. Hong, Catalytic oxidation of reduced sulfur compounds by homogeneous and heterogeneous Co(II) phthalocyanine complexes, Science of The Total Environment, Volume 64, Issues 1–2, June 1987, Pages 99-115, ISSN 0048-9697, http://dx.doi.org/10.1016/0048-9697(87)90125-2. (http://www.sciencedirect.com/science/article/pii/0048969787901252)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59655
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:19 Aug 2015 17:36
Last Modified:03 Mar 2020 13:01

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