Mechanism of hydrogen sulfide oxidation by manganese(IV) oxide in aqueous solutions

The kinetics of reductive dissolution of Mn(IV) oxides by hydrogen sulfide has been investigated. The concentration of total H2S(aq) in the reaction system ranged between 1.0 and 4.0 mM and was adjusted keeping a constant partial pressure of the gaseous H2S phase above the solution. The reaction pro...

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Autor principal:	Herszage, Julián
Publicado:	2003
Materias:	Inner sphere surface complexes Reductive dissolution Complexation Dissolution Hydrogen sulfide Oxidation Partial pressure pH effects Rate constants Manganese compounds
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07437463_v19_n23_p9684_Herszage http://hdl.handle.net/20.500.12110/paper_07437463_v19_n23_p9684_Herszage
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_07437463_v19_n23_p9684_Herszage
record_format	dspace
spelling	paper:paper_07437463_v19_n23_p9684_Herszage2025-07-30T18:21:19Z Mechanism of hydrogen sulfide oxidation by manganese(IV) oxide in aqueous solutions Herszage, Julián Inner sphere surface complexes Reductive dissolution Complexation Dissolution Hydrogen sulfide Oxidation Partial pressure pH effects Rate constants Manganese compounds The kinetics of reductive dissolution of Mn(IV) oxides by hydrogen sulfide has been investigated. The concentration of total H2S(aq) in the reaction system ranged between 1.0 and 4.0 mM and was adjusted keeping a constant partial pressure of the gaseous H2S phase above the solution. The reaction products were identified as Mn(II), sulfate, elemental sulfur, and small amounts of thiosulfate. The distribution of products changes with pH; sulfate is the main product at low pH values while elemental sulfur is the main product at near neutral pH values. The rate constant decreased with an increase in pH. Experimental data indicate that the rate law is first order on both the surface sites and the H2S concentration. The reaction proceeds via the formation of two different inner-sphere surface complexes ≡MNIVS- and ≡MNIVSH and their further oxidation to products. A mechanism in agreement with the experimental results is proposed. Fil:Herszage, J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2003 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07437463_v19_n23_p9684_Herszage http://hdl.handle.net/20.500.12110/paper_07437463_v19_n23_p9684_Herszage
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Inner sphere surface complexes Reductive dissolution Complexation Dissolution Hydrogen sulfide Oxidation Partial pressure pH effects Rate constants Manganese compounds
spellingShingle	Inner sphere surface complexes Reductive dissolution Complexation Dissolution Hydrogen sulfide Oxidation Partial pressure pH effects Rate constants Manganese compounds Herszage, Julián Mechanism of hydrogen sulfide oxidation by manganese(IV) oxide in aqueous solutions
topic_facet	Inner sphere surface complexes Reductive dissolution Complexation Dissolution Hydrogen sulfide Oxidation Partial pressure pH effects Rate constants Manganese compounds
description	The kinetics of reductive dissolution of Mn(IV) oxides by hydrogen sulfide has been investigated. The concentration of total H2S(aq) in the reaction system ranged between 1.0 and 4.0 mM and was adjusted keeping a constant partial pressure of the gaseous H2S phase above the solution. The reaction products were identified as Mn(II), sulfate, elemental sulfur, and small amounts of thiosulfate. The distribution of products changes with pH; sulfate is the main product at low pH values while elemental sulfur is the main product at near neutral pH values. The rate constant decreased with an increase in pH. Experimental data indicate that the rate law is first order on both the surface sites and the H2S concentration. The reaction proceeds via the formation of two different inner-sphere surface complexes ≡MNIVS- and ≡MNIVSH and their further oxidation to products. A mechanism in agreement with the experimental results is proposed.
author	Herszage, Julián
author_facet	Herszage, Julián
author_sort	Herszage, Julián
title	Mechanism of hydrogen sulfide oxidation by manganese(IV) oxide in aqueous solutions
title_short	Mechanism of hydrogen sulfide oxidation by manganese(IV) oxide in aqueous solutions
title_full	Mechanism of hydrogen sulfide oxidation by manganese(IV) oxide in aqueous solutions
title_fullStr	Mechanism of hydrogen sulfide oxidation by manganese(IV) oxide in aqueous solutions
title_full_unstemmed	Mechanism of hydrogen sulfide oxidation by manganese(IV) oxide in aqueous solutions
title_sort	mechanism of hydrogen sulfide oxidation by manganese(iv) oxide in aqueous solutions
publishDate	2003
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07437463_v19_n23_p9684_Herszage http://hdl.handle.net/20.500.12110/paper_07437463_v19_n23_p9684_Herszage
work_keys_str_mv	AT herszagejulian mechanismofhydrogensulfideoxidationbymanganeseivoxideinaqueoussolutions
_version_	1840321502744936448

Mechanism of hydrogen sulfide oxidation by manganese(IV) oxide in aqueous solutions

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