CaltechAUTHORS
  A Caltech Library Service

Kinetics and mechanism of the oxidation of sulfide by oxygen: catalysis by homogeneous metal-phthalocyanine complexes

Hoffmann, Michael R. and Lim, Brian C. (1979) Kinetics and mechanism of the oxidation of sulfide by oxygen: catalysis by homogeneous metal-phthalocyanine complexes. Environmental Science and Technology, 13 (11). pp. 1406-1414. ISSN 0013-936X. http://resolver.caltech.edu/CaltechAUTHORS:20150820-144459940

Full text is not posted in this repository. Consult Related URLs below.

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:20150820-144459940

Abstract

The kinetics of the catalyzed autoxidation of hydrogen sulfide to sulfur, thiosulfate, and sulfate in aqueous solution has been investigated potentiometrically over the pH range 5-12. The catalytic effects of cobalt(II), nickel(II), and copper(I1) 4,4’,4”,4”'- tetrasulfophthalocyanine have been determined, and differences in catalytic ability have been explained in terms of relative capacity of the octahedral complexes to reversibly bind oxygen. Kinetic data have been analyzed in terms of a bisubstrate Michaelis-Menton rate law. The rate law and other data indicate that the catalyzed reaction proceeds via the formation of a tertiary-activated complex in which HS^- and O_2 reversibly bind with CoTSP^(2-). pH variations have been explained in terms of the acid dissociation of H_2S, general base catalysis, and deprotonation of pyrrole nitrogens within the phthalocyanine ring.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/es60159a014DOIArticle
http://pubs.acs.org/doi/abs/10.1021/es60159a014PublisherArticle
ORCID:
AuthorORCID
Hoffmann, Michael R.0000-0002-0432-6564
Additional Information:© 1979 American Chemical Society. Received June 23, 1978. Accepted August 17, 1979. Funds for his research project were provided by the Graduate School and the Sommerfeld Endowment of the Department of Civil and Mineral Engineering of the University of Minnesota. This support is greatly appreciated.
Funders:
Funding AgencyGrant Number
University of MinnesotaUNSPECIFIED
Record Number:CaltechAUTHORS:20150820-144459940
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150820-144459940
Official Citation:Kinetics and mechanism of the oxidation of sulfide by oxygen: catalysis by homogeneous metal-phthalocyanine complexes Michael R. Hoffmann and Brian C. Lim Environmental Science & Technology 1979 13 (11), 1406-1414 DOI: 10.1021/es60159a014
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59798
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:20 Aug 2015 23:18
Last Modified:20 Aug 2015 23:18

Repository Staff Only: item control page