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Catalysts 2016, 6(12), 185; doi:10.3390/catal6120185

Untangling the Role of the Capping Agent in Nanocatalysis: Recent Advances and Perspectives

Dipartimento di Chimica, Università degli Studi di Milano, via Golgi 19, 20133 Milano, Italy
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Academic Editor: Keith Hohn
Received: 28 October 2016 / Revised: 18 November 2016 / Accepted: 23 November 2016 / Published: 27 November 2016
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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. View Full-Text
Keywords: heterogeneous catalysis; metal nanoparticles; active site; capping agent; interfaces; promoter; poison; modifier heterogeneous catalysis; metal nanoparticles; active site; capping agent; interfaces; promoter; poison; modifier
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Campisi, S.; Schiavoni, M.; Chan-Thaw, C.E.; Villa, A. Untangling the Role of the Capping Agent in Nanocatalysis: Recent Advances and Perspectives. Catalysts 2016, 6, 185.

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