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

Paper ID Volume ID Publish Year Pages File Format Full-Text
43034 45952 2008 10 PDF Available
Title
Pt/TiO2 (rutile) catalysts for sulfuric acid decomposition in sulfur-based thermochemical water-splitting cycles
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 1 wt% Pt/TiO2 (rutile) catalysts submitted to flowing concentrated sulfuric acid at 1123 K and atmospheric pressure for different times on stream between 0 and 548 h. Catalyst activity showed an initial decrease that lasted for about 66 h, followed by a slight recovery of activity between 66 and 102 h TOS, and a period of slower deactivation after 102 h 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.

Graphical abstractSplitting of water into hydrogen and oxygen can be accomplished by thermochemical cycles at lower temperatures than by direct thermal decomposition. Sulfur-based thermochemical cycles employ a high temperature sulfuric acid decomposition reaction as the oxygen producing reaction. This work reports activity and post-operation analyses of 1 wt% Pt/TiO2 (rutile) catalysts for decomposing concentrated sulfuric acid at 1123 K.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Sulfuric acid decomposition catalysts; Thermochemical water splitting; Sulfur–iodine cycle; Platinum titania catalysts
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Pt/TiO2 (rutile) catalysts for sulfuric acid decomposition in sulfur-based thermochemical water-splitting cycles
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 338, Issues 1–2, 1 April 2008, Pages 27–36
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us