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Ethanol partial photoxidation on Pt/TiO2 catalysts as green route for acetaldehyde synthesis

Paper ID Volume ID Publish Year Pages File Format Full-Text
55346 47048 2012 9 PDF Available
Title
Ethanol partial photoxidation on Pt/TiO2 catalysts as green route for acetaldehyde synthesis
Abstract

Heterogeneous photocatalytic partial oxidation of ethanol was studied over different Pt/TiO2 as an alternative green process for acetaldehyde production.The catalysts were synthesized through the photodeposition of Pt over sol–gel TiO2 with platinum loads of 0.5 and 1 wt.%. The effect of some experimental conditions during photodeposition, such as deposition time and Pt loading, was investigated. A short deposition time at 0.5 wt.% Pt nominal loading led to small average particle size of platinum (2–3 nm) homogeneously distributed all over the TiO2 surface.Ethanol partial oxidation was tested in a gas–solid photocatalytic fluidized bed reactor at high illumination efficiency, using different reaction temperatures. Activity results have been correlated with characterization results of the different samples. Platinized samples prepared with short deposition times showed high conversion levels and high selectivity to acetaldehyde. Materials prepared at longer times, 120 min, showed selectivities >98%, although with lower ethanol conversion.Sample with 1 wt.% Pt loading prepared with 15 min deposition time combined a good compromise between a relevant ethanol conversion and a very high selectivity to acetaldehyde at a selected reaction temperature of 80 °C, with an acetaldehyde yield higher than 80%, which make of this catalyst a good candidate for acetaldehyde production by photocatalysis.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (185 K)Download as PowerPoint slideHighlights► Selective partial oxidation of ethanol to acetaldehyde by photocatalysis. ► Study of photodeposition parameters in the preparation of Pt/TiO2 photocatalysts. ► High influence of photodeposition time on activity and selectivity. ► High conversion levels and >98% selectivity were obtained.

Keywords
Pt/TiO2; Photocatalysis; Partial photooxidation; Ethanol; Photodeposition
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Ethanol partial photoxidation on Pt/TiO2 catalysts as green route for acetaldehyde synthesis
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 196, Issue 1, 30 November 2012, Pages 101–109
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