Pt/TiO2 (rutile) catalysts for sulfuric acid decomposition in sulfur-based thermochemical water-splitting cycles

TitlePt/TiO2 (rutile) catalysts for sulfuric acid decomposition in sulfur-based thermochemical water-splitting cycles
Publication TypeJournal Article
AuthorsPetkovic L.M, Ginosar D.M, Rollins H.W, Burch K.C, Pinhero P.J, Farrell H.H
JournalApplied Catalysis A: General
Volume338
Issue1
Pagination27-36
ISSN0926-860X
Abstract

Thermochemical cycles consist of a series of chemical reactions to produce hydrogen from water at lower temperatures than by direct thermal decomposition. All the sulfur-based cycles for water splitting employ the sulfuric acid decomposition reaction. This work reports the studies performed on 1wt% Pt/TiO2 (rutile) catalysts submitted to flowing concentrated sulfuric acid at 1123K and atmospheric pressure for different times on stream between 0 and 548h. Catalyst activity showed an initial decrease that lasted for about 66h, followed by a slight recovery of activity between 66 and 102h TOS, and a period of slower deactivation after 102h TOS. Catalyst sulfation did not seem to be detrimental to catalyst activity. The activity profile suggested that a complex dynamic situation, involving platinum sintering, volatilization, and oxidation, along with TiO2 morphological changes, affected catalyst activity in a non-monotonic way.

Notes

'doi: 10.1021/acsenergylett.0c01132\n - I.Am.Hydrogen'
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URLhttp://www.sciencedirect.com/science/article/pii/S0926860X07007363
DOI10.1016/j.apcata.2007.12.016
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