Abstract
In this review, we discuss selected examples from recent literature on the role of the support on directing the nanostructures of Au-based monometallic and bimetallic nanoparticles. The role of support is then discussed in relation to the catalytic properties of Au-based monometallic and bimetallic nanoparticles using different gas phase and liquid phase reactions. The reactions discussed include CO oxidation, aerobic oxidation of monohydric and polyhydric alcohols, selective hydrogenation of alkynes, hydrogenation of nitroaromatics, CO2 hydrogenation, C–C coupling, and methane oxidation. Only studies where the role of support has been explicitly studied in detail have been selected for discussion. However, the role of support is also examined using examples of reactions involving unsupported metal nanoparticles (i.e., colloidal nanoparticles). It is clear that the support functionality can play a crucial role in tuning the catalytic activity that is observed and that advanced theory and characterization add greatly to our understanding of these fascinating catalysts.
Highlights
In this review, we discuss selected examples from recent literature on the role of the support on directing the nanostructures of Au-based monometallic and bimetallic nanoparticles
Gold catalysis has become the subject of received intense attention from both the academic and industrial research communities.[9−11] It has become clear that the identity of the support material and the gold−support interfacial sites generated often play a crucial role in determining the catalytic behavior of supported gold NPs.[10,12]
Because Au catalysts are well-known to be sensitive to the synthesis methods, clarifying the role played by the support materials for Au catalysts in the preparation process is the first step toward developing an overall understanding of their role in any specific catalytic processes
Summary
The role of support in Au catalysts can be first seen during the catalyst preparation, which has been a challenging task partly due to a relatively low melting temperature of Au (1064 °C) compared to that of other precious metals such as Pd (1555 °C) and Pt (1768 °C). Because Au catalysts are well-known to be sensitive to the synthesis methods, clarifying the role played by the support materials for Au catalysts in the preparation process is the first step toward developing an overall understanding of their role in any specific catalytic processes. They can serve as anchor sites to stabilize the catalytically active species These will be mainly discussed, Preparing Au Catalysts on Oxides and Other Conventional Supports. Support materials carry specific morphologies and functionalities that need to be preserved or achieved during the catalyst synthesis procedure. These will be discussed, Preparing Au Catalysts on “Engineered” Nanostructured Support Materials. Publications on nanoporous Au and Au alloys will be excluded from this section
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