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Reverse micelle synthesis and characterization of supported Pt/Ni bimetallic catalysts on γ-Al2O3

Paper ID Volume ID Publish Year Pages File Format Full-Text
41461 45890 2011 7 PDF Available
Title
Reverse micelle synthesis and characterization of supported Pt/Ni bimetallic catalysts on γ-Al2O3
Abstract

Reverse micelle synthesis was used to improve the nanoparticle size uniformity of bimetallic Pt/Ni nanoparticles supported on γ-Al2O3. Two impregnation methods were investigated to optimize the use of the micelle method: (1) step-impregnation, where Ni nanoparticles were chemically reduced in microemulsion and then supported, followed by Pt deposition using incipient wetness impregnation, and (2) co-impregnation, where Ni and Pt were chemically reduced simultaneously in microemulsion and then supported. Transmission electron microscopy (TEM) was used to characterize the particle size distribution. Atomic absorption spectroscopy (AAS) was used to perform elemental analysis of bimetallic catalysts. Extended X-ray absorption fine structure (EXAFS) measurements were utilized to confirm the formation of the Pt–Ni bimetallic bond in the step-impregnated catalyst. CO pulse chemisorption and Fourier transform infrared spectroscopy (FTIR) studies of 1,3-butadiene hydrogenation in a batch reactor were performed to determine the catalytic activity. Step-impregnated Pt/Ni catalyst demonstrated enhanced hydrogenation activity over the parent monometallic Pt and Ni catalysts due to bimetallic bond formation. The catalyst synthesized using co-impregnation showed no enhanced activity, behaving similarly to monometallic Ni. Overall, our results indicate that reverse micelle synthesis combined with incipient wetness impregnation produced small, uniform nanoparticles with bimetallic bonds that enhanced hydrogenation activity.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (222 K)Download as PowerPoint slideResearch highlights▶ Reverse micelle method was used to synthesize supported Pt–Ni bimetallic catalysts. ▶ TEM was employed to verify uniform size distribution of the nanoparticles. ▶ EXAFS was utilized to confirm the formation of Pt–Ni bimetallic bonds. ▶ The reverse micelle synthesized Pt–Ni catalysts showed higher hydrogenation activity than monometallic Pt and Ni catalysts.

Keywords
Reverse micelle; Microemulsion; Pt/Ni bimetallic catalysts; Hydrogenation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 394, Issues 1–2, 28 February 2011, Pages 41–47
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