Capping agents (organic ligands, polymers, surfactants, etc.) are a basic component in the synthesis of metal nanoparticles with controlled size and well-defined shape. However, their influence on the performances of nanoparticle-based catalysts is multifaceted and controversial. Indeed, capping agent can act as a "poison", limiting the accessibility of active sites, as well as a "promoter", producing improved yields and unpredicted selectivity control. These effects can be ascribed to the creation of a metal-ligand interphase, whose unique properties are responsible for the catalytic behavior. Therefore, understanding the structure of this interphase is of prime interest for the optimization of tailored nanocatalyst design. This review provides an overview of the interfacial key features affecting the catalytic performances and details a selection of related literature examples. Furthermore, we highlight critical points necessary for the design of highly selective and active catalysts with surface and interphase control.

Untangling the role of the capping agent in nanocatalysis : recent advances and perspectives / S. Campisi, M. Schiavoni, C.E. Chan-Thaw, A. Villa. - In: CATALYSTS. - ISSN 2073-4344. - 6:12(2016 Nov 27), pp. 185.1-185.21.

Untangling the role of the capping agent in nanocatalysis : recent advances and perspectives

S. Campisi
;
M. Schiavoni
Secondo
;
C.E. Chan-Thaw
Penultimo
;
A. Villa
2016

Abstract

Capping agents (organic ligands, polymers, surfactants, etc.) are a basic component in the synthesis of metal nanoparticles with controlled size and well-defined shape. However, their influence on the performances of nanoparticle-based catalysts is multifaceted and controversial. Indeed, capping agent can act as a "poison", limiting the accessibility of active sites, as well as a "promoter", producing improved yields and unpredicted selectivity control. These effects can be ascribed to the creation of a metal-ligand interphase, whose unique properties are responsible for the catalytic behavior. Therefore, understanding the structure of this interphase is of prime interest for the optimization of tailored nanocatalyst design. This review provides an overview of the interfacial key features affecting the catalytic performances and details a selection of related literature examples. Furthermore, we highlight critical points necessary for the design of highly selective and active catalysts with surface and interphase control.
Active site; Capping agent; Heterogeneous catalysis; Interfaces; Metal nanoparticles; Modifier; Poison; Promoter; Catalysis; Physical and Theoretical Chemistry
Settore CHIM/02 - Chimica Fisica
Settore CHIM/03 - Chimica Generale e Inorganica
Settore CHIM/04 - Chimica Industriale
27-nov-2016
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/491298
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