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Synthesis and characterization of supported bimetallic overlayer catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
42931 45947 2009 9 PDF Available
Title
Synthesis and characterization of supported bimetallic overlayer catalysts
Abstract

The directed deposition technique was used to synthesize alumina-supported bimetallic overlayer Pd on Re (Re@Pd) and Pt on Ni (Ni@Pt) catalysts. Computational and single crystal studies have predicted unique adsorption properties for similar overlayer type catalysts compared to the monometallic catalysts. The directed deposition technique combines the use of inhibitors and a surface reaction to produce the desired overlayer structure. The Re@Pd and Ni@Pt catalysts were characterized using hydrogen chemisorption, transmission election microscopy (TEM), and energy dispersive spectroscopy (EDS) to correlate properties with synthesis conditions. H2 chemisorption indicated the proper synthesis conditions to deposit the overlayer metal on the base metal catalyst particle as desired. When a surface deposition inhibitor was not used, evidence for the formation of isolated particles of the overlayer metal was detected. Re@Pd catalysts showed decreased hydrogen heat of adsorption compared to Pd or Re monometallic catalysts as predicted by the literature. Ni@Pt catalysts demonstrated intermediate H2 heat of adsorption compared to Pt and Ni. TEM/EDS were used to demonstrate that the overlayer metal was associated with the base metal particles as desired.

Graphical abstractDirected deposition was used to synthesize alumina-supported bimetallic overlayer Pd on Re (Re@Pd) and Pt on Ni (Ni@Pt) catalysts. The directed deposition technique combines the use of inhibitors and a surface reaction to produce the desired overlayer structure. Re@Pd catalysts showed decreased hydrogen heat of adsorption compared to Pd or Re monometallic catalysts as predicted by computational studies.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Pd/Re; Pt/Ni; Hydrogen chemisorption; Hydrogen heat of adsorption
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Synthesis and characterization of supported bimetallic overlayer catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 358, Issue 1, 30 April 2009, Pages 79–87
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
You save - $31
Price after discount Only $4.95
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