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Shape- and size-specific chemistry of Ag nanostructures in catalytic ethylene epoxidation
Phillip Christopher,Suljo Linic +1 more
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In this article, shape and size controlled synthesis of Ag nanoparticles is used to show that silver nanocubes exhibit higher selectivity than nanowires and nanospheres for a given shape, larger particles offer improved selectivity.Abstract:
Catalytic selectivity in the epoxidation of ethylene to form ethylene oxide on alumina-supported silver catalysts is dependent on the geometric structure of catalytically active Ag particles and reaction conditions. Shape and size controlled synthesis of Ag nanoparticles is used to show that silver nanocubes exhibit higher selectivity than nanowires and nanospheres. For a given shape, larger particles offer improved selectivity. The enhanced selectivity toward ethylene oxide is attributed to the nature of the exposed Ag surface facets; Ag nanocubes and nanowires are dominated by (100) surface facet and Ag nanospheres are dominated by (111). Furthermore, the concentration of undercoordinated surface sites is related to diminished selectivity to ethylene oxide. We demonstrate that a simple model can account for the impact of chemical and physical factors on the reaction selectivity. These observations have also been used to design a selective catalyst for the ethylene epoxidation reaction.read more
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Metal Catalysts for Heterogeneous Catalysis: From Single Atoms to Nanoclusters and Nanoparticles.
Lichen Liu,Avelino Corma +1 more
TL;DR: This Review will compare the results obtained from different systems and try to give a picture on how different types of metal species work in different reactions and give perspectives on the future directions toward better understanding of the catalytic behavior of different metal entities in a unifying manner.
Journal ArticleDOI
Visible-light-enhanced catalytic oxidation reactions on plasmonic silver nanostructures
TL;DR: It is shown that plasmonic nanostructures of silver can concurrently use low-intensity visible light and thermal energy to drive catalytic oxidation reactions--such as ethylene epoxidation, CO oxidation, and NH₃ oxidation--at lower temperatures than their conventional counterparts that use only thermal stimulus.
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Water Splitting on Composite Plasmonic-Metal/Semiconductor Photoelectrodes: Evidence for Selective Plasmon-Induced Formation of Charge Carriers near the Semiconductor Surface
David B. Ingram,Suljo Linic +1 more
TL;DR: It is demonstrated that this issue can be alleviated significantly by combining a semiconductor photocatalyst with tailored plasmonic-metal nanostructures, and the interaction of localized electric fields with the neighboring semiconductor allows for the selective formation of electron/hole (e(-)/h(+)) pairs in the near-surface region of the semiconductor.
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Singular characteristics and unique chemical bond activation mechanisms of photocatalytic reactions on plasmonic nanostructures
TL;DR: It is shown that plasmonic metallic nanostructures represent a new family of photocatalysts that exhibit fundamentally different behaviour compared with semiconductors, and that this new family could prove useful for many heterogeneous catalytic processes that cannot be activated using conventional thermal processes on metals or photoc atalytic processes on semiconductor.
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Catalytic conversion of solar to chemical energy on plasmonic metal nanostructures
TL;DR: A review of plasmonic catalysis can be found in this article, focusing on the underlying physical mechanisms and their application in catalysis, as well as limitations and future perspectives.
References
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Journal ArticleDOI
Shape-Controlled Synthesis of Gold and Silver Nanoparticles
Yugang Sun,Younan Xia +1 more
TL;DR: Monodisperse samples of silver nanocubes were synthesized in large quantities by reducing silver nitrate with ethylene glycol in the presence of poly(vinyl pyrrolidone) (PVP), characterized by a slightly truncated shape bounded by {100, {110}, and {111} facets.
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Towards the computational design of solid catalysts
TL;DR: The first steps towards using computational methods to design new catalysts are reviewed and how, in the future, such methods may be used to engineer the electronic structure of the active surface by changing its composition and structure are discussed.
Journal ArticleDOI
Metal Catalysts for Heterogeneous Catalysis: From Single Atoms to Nanoclusters and Nanoparticles.
Lichen Liu,Avelino Corma +1 more
TL;DR: This Review will compare the results obtained from different systems and try to give a picture on how different types of metal species work in different reactions and give perspectives on the future directions toward better understanding of the catalytic behavior of different metal entities in a unifying manner.
Journal ArticleDOI
Shape-Controlled Synthesis of Colloidal Platinum Nanoparticles
TL;DR: Tetrahedral, cubic, irregular-prismatic, icosahedral, and cubo-octahedral particle shapes were observed, whose distribution was dependent on the concentration ratio of the capping polymer material to the platinum cation.
Journal ArticleDOI
The impact of nanoscience on heterogeneous catalysis
TL;DR: Advances in characterization methods have led to a molecular-level understanding of the relationships between nanoparticle properties and catalytic performance, and this knowledge is contributing to the design and development of new catalysts.