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Hydrogen production through microheterogeneous photocatalysis of hydrogen sulfide cleavage. The thiosulfate cycle

Abstract

Cleavage of hydrogen sulfide into hydrogen and sulfur occurs in alkaline aqueous CdS dispersions under visible light illumination. Small quantities of a noble metal catalyst (RuO/sub 2/) loaded onto 'naked' CdS particles markedly improve the yield of hydrogen formation. The effect of RuO/sub 2/ is ascribed to catalysis of electron transfer to proton. Simultaneous and efficient photogeneration of hydrogen and thiosulfate occurs in CdS dispersions containing both sulfite and bisulfide (or sulfide) ions. Electron transfer from the conduction band of CdS to that of TiO/sub 2/ particles occurs in alkaline suspensions containing these HS/sup -/ ions and has been exploited to improve the performance of a system achieving decomposition of H/sub 2/S by visible light. Equally important is a recent finding that the performance of a system containing 'naked' CdS in combination with RuO/sub 2/-loaded TiO/sub 2/ particles is far better than that of CdS/RuO/sub 2/ alone. Additionally, conduction band electrons produced by bandgap excitation of TiO/sub 2/ particles efficiently reduce thiosulfate to sulfide and sulfite. The valence band process in alklaine TiO/sub 2/ dispersions is thought to involve oxidation of S/sub 2/O/sub 3//sup 2 -/ to tetrathionate, S/sub 4/O/sub 6//sup 2 -/, which quantitatively dismutates into sulfite and thiosulfate.  More>>
Publication Date:
Jan 01, 1985
Product Type:
Journal Article
Reference Number:
GB-86-000211; EDB-86-077366
Resource Relation:
Journal Name: Int. J. Hydrogen Energy; (United States); Journal Volume: 10:11
Subject:
08 HYDROGEN; HYDROGEN PRODUCTION; PHOTOCHEMICAL REACTIONS; HYDROGEN SULFIDES; CATALYSIS; THIOSULFATES; VISIBLE RADIATION; CHALCOGENIDES; CHEMICAL REACTIONS; ELECTROMAGNETIC RADIATION; HYDROGEN COMPOUNDS; RADIATIONS; SULFIDES; SULFUR COMPOUNDS; 080106* - Hydrogen- Production- Biosynthesis & Photochemical Processes
OSTI ID:
5965903
Research Organizations:
Concordia Univ., Montreal, Canada. Dept. of Chemistry; Ecole Polytechnique Federale, Lausanne, Switzerland. Inst. de Chimie Physique; Turin Univ., Italy. Dip. di Chimica Analitica
Country of Origin:
United States
Language:
English
Other Identifying Numbers:
Journal ID: CODEN: IJHED
Submitting Site:
GB
Size:
Pages: 737-741
Announcement Date:
Apr 01, 1986

Citation Formats

Borgarello, E, Serpone, N, Graetzel, M, and Pelizzetti, E. Hydrogen production through microheterogeneous photocatalysis of hydrogen sulfide cleavage. The thiosulfate cycle. United States: N. p., 1985. Web. doi:10.1016/0360-3199(85)90109-0.
Borgarello, E, Serpone, N, Graetzel, M, & Pelizzetti, E. Hydrogen production through microheterogeneous photocatalysis of hydrogen sulfide cleavage. The thiosulfate cycle. United States. doi:10.1016/0360-3199(85)90109-0.
Borgarello, E, Serpone, N, Graetzel, M, and Pelizzetti, E. 1985. "Hydrogen production through microheterogeneous photocatalysis of hydrogen sulfide cleavage. The thiosulfate cycle." United States. doi:10.1016/0360-3199(85)90109-0. https://www.osti.gov/servlets/purl/10.1016/0360-3199(85)90109-0.
@misc{etde_5965903,
title = {Hydrogen production through microheterogeneous photocatalysis of hydrogen sulfide cleavage. The thiosulfate cycle}
author = {Borgarello, E, Serpone, N, Graetzel, M, and Pelizzetti, E}
abstractNote = {Cleavage of hydrogen sulfide into hydrogen and sulfur occurs in alkaline aqueous CdS dispersions under visible light illumination. Small quantities of a noble metal catalyst (RuO/sub 2/) loaded onto 'naked' CdS particles markedly improve the yield of hydrogen formation. The effect of RuO/sub 2/ is ascribed to catalysis of electron transfer to proton. Simultaneous and efficient photogeneration of hydrogen and thiosulfate occurs in CdS dispersions containing both sulfite and bisulfide (or sulfide) ions. Electron transfer from the conduction band of CdS to that of TiO/sub 2/ particles occurs in alkaline suspensions containing these HS/sup -/ ions and has been exploited to improve the performance of a system achieving decomposition of H/sub 2/S by visible light. Equally important is a recent finding that the performance of a system containing 'naked' CdS in combination with RuO/sub 2/-loaded TiO/sub 2/ particles is far better than that of CdS/RuO/sub 2/ alone. Additionally, conduction band electrons produced by bandgap excitation of TiO/sub 2/ particles efficiently reduce thiosulfate to sulfide and sulfite. The valence band process in alklaine TiO/sub 2/ dispersions is thought to involve oxidation of S/sub 2/O/sub 3//sup 2 -/ to tetrathionate, S/sub 4/O/sub 6//sup 2 -/, which quantitatively dismutates into sulfite and thiosulfate. The photodriven disproportionation of thiosulfate into sulfide and sulfate is of great interest in systems that photochemically cleave hydrogen sulfide into hydrogen and sulfur. (author).}
doi = {10.1016/0360-3199(85)90109-0}
journal = {Int. J. Hydrogen Energy; (United States)}
volume = {10:11}
journal type = {AC}
place = {United States}
year = {1985}
month = {Jan}
}