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Properties of Pt/C catalysts prepared by adsorption of anionic precursor and reduction with hydrogen. Influence of acidity of solution

Paper ID Volume ID Publish Year Pages File Format Full-Text
42721 45938 2009 8 PDF Available
Title
Properties of Pt/C catalysts prepared by adsorption of anionic precursor and reduction with hydrogen. Influence of acidity of solution
Abstract

Carbon-supported Pt/C catalysts prepared with H2PtCl6 as metal precursor have been studied by temperature-programmed reduction (TPR), transmission electron microscopy (TEM) and CO chemisorption in order to investigate the effect of acidity of the solution on the catalyst properties. The catalytic activity of the samples has been tested in structure insensitive reaction of cyclohexene hydrogenation. The catalysts were prepared by adsorption of platinum precursor on activated carbons with different pore structure followed by drying and reduction in flowing hydrogen at 523 K. The use of acidic and highly basic solution during the impregnation of microporous carbons led to highly dispersed catalysts with low activity. It has been suggested that a part of the supported metal became inaccessible to the organic substrate due to localization of metal particles in narrow pores of the support. However, in the range of intermediate solution pH, the activity per surface metal atom remained at a high level. Such phenomenon is attributed to the formation of bulky species of platinum precursor, which hardly penetrates into the small pores of the support, thus preventing a blocking effect. Effect of acidity of the solution proved significant for Pt/C catalysts on the activated carbons with the smaller micropores and higher concentration of oxygen-containing groups.

Graphical abstractEffect of acidity of the solution on the dispersion and activity in cyclohexene hydrogenation of Pt/C catalysts was investigated. Differences in catalytic activity are ascribed to variation in the extent of Pt particles blocking in the carbon pores. The effect proved to be larger on activated carbons with the smaller micropores and higher concentration of the oxygen-containing groups.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Platinum; Activated carbons; Acidity; Cyclohexene hydrogenation; CO chemisorption; TEM; Blocking effect
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Properties of Pt/C catalysts prepared by adsorption of anionic precursor and reduction with hydrogen. Influence of acidity of solution
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 355, Issues 1–2, 28 February 2009, Pages 115–122
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
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