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Pt dispersion control in Pt/SiO2 by calcination temperature using chloroplatinic acid as catalyst precursor

Paper ID Volume ID Publish Year Pages File Format Full-Text
40959 45872 2012 7 PDF Available
Title
Pt dispersion control in Pt/SiO2 by calcination temperature using chloroplatinic acid as catalyst precursor
Abstract

The effect of pretreatment conditions on the dispersion of Pt/SiO2 was studied. The catalysts were prepared by impregnation with H2PtCl6 as the Pt precursor. Direct reduction of the supported Pt precursor in hydrogen flow was compared to calcinations of the precursor in air flow at various temperatures followed by reduction in hydrogen flow. When the supported precursor was directly reduced in hydrogen flow, Pt dispersion was independent of the reduction temperature. In contrast, when the supported precursor was calcined and then reduced, Pt dispersion was not affected by the reduction temperature but depended heavily on the calcination temperature, ranging widely from 7 to 70%. A good correlation was seen between the particle size calculated from CO adsorption and that observed with transmission electron microscope. Furthermore, it was found that calcination at the temperature at which PtCl2 is stable gives the highest Pt dispersion. X-ray fluorescence analysis of the calcined samples confirmed the formation of PtCl2. High Pt dispersion after calcination at optimum temperature was also corroborated with X-ray diffraction analysis from the absence of sharp diffraction peaks. The results suggest that prompt formation and redispersion of PtCl2 caused high Pt dispersion.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (151 K)Download as PowerPoint slideHighlights► Pt dispersion of Pt/SiO2 depends heavily on the calcination temperature. ► Highly dispersed Pt catalyst was obtained after calcination at the optimum temperature (375 °C) and reduction. ► The change in Pt dispersion can be explained by the distribution state of Pt precursor on the support.

Keywords
Platinum silica catalyst; Platinum dispersion; Calcination temperature; Platinum precursor; Dispersed PtCl2
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Pt dispersion control in Pt/SiO2 by calcination temperature using chloroplatinic acid as catalyst precursor
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 427–428, 15 June 2012, Pages 85–91
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