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          Institute: Fritz-Haber-Institut     Collection: Inorganic Chemistry     Display Documents

ID: 457111.0, Fritz-Haber-Institut / Inorganic Chemistry
Using supported Au nanoparticles as starting material for preparing uniform Au/Pd bimetallic catalysts
Authors:Villa, Alberto; Wang, Di; Su, Dang Sheng; Veith, Gabriel M.; Prati, Laura
Research Context:HRTM
Date of Publication (YYYY-MM-DD):2010
Title of Journal:Physical Chemistry Chemical Physics
Journal Abbrev.:PCCP
Issue / Number:9
Start Page:2183
End Page:2189
Copyright:© Royal Society of Chemistry 2010
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:One of the best methods for producing bulk homogeneous (composition) supported bimetallic AuPd clusters involves the immobilization of a protected Au seed followed by the addition of Pd. This paper investigates the importance of this gold seed in controlling the resulting bimetallic AuPd clusters structures, sizes and catalytic activities by investigating three different gold seeds. Uniform Au-Pd alloy were obtained when a steric/electrostatic protecting group, polyvinyl alcohol (PVA), was used to form the gold clusters on activated carbon (AC). In contrast Au/AC precursors prepared using Au nanoparticles with only electrostatic stabilization tetrakis hydroxypropyl phosphonium chloride (THPC), or no stabilization (magnetron sputtering) produced inhomogeneous alloys and segregation of the gold and palladium. The uniform alloyed catalyst (Pd-AuPVA/AC) is the most active and selective catalyst, while the inhomogenous catalysts are less active and selective. Further study of the PVA protected Au clusters revealed that the amount of PVA used is also critical for the preparation of uniform alloyed catalyst, their stability, and their catalytic activity.
Free Keywords:Gold – Palladium alloy; alcohol oxidation; glycerol; protecting molecules; sputtering; physical vapor deposition
External Publication Status:published
Document Type:Article
Communicated by:Robert Schlögl
Affiliations:Fritz-Haber-Institut/Inorganic Chemistry/Micro- and Nanostructure / Carbon
External Affiliations:Università di Milano, Dipartimento di Chimica Inorganica Metallorganica e Analitica, I-20133 Milano, Italy
Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
Identifiers:URL:http://dx.doi.org/10.1039/b919322g [only for subscriber]
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