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Change in the catalytic reactivity of Pt nanocubes in the presence of different surface-capping agents

Paper ID Volume ID Publish Year Pages File Format Full-Text
52771 46886 2009 5 PDF Available
Title
Change in the catalytic reactivity of Pt nanocubes in the presence of different surface-capping agents
Abstract

Polyvinylpyrrolidone (PVP; MW 55,000)-capped and tetradecyltrimethylammonium bromide (TTAB; MW 336)-capped Pt nanoparticles were synthesized with the same cubic shape and similar particle size (8.1 vs. 8.6 nm, respectively). These Pt nanocubes were used as catalysts for reactions of H+, C2H4, C6H6, and O2NC6H4OH on the Pt surface. With increasing molecular size of the reactants (H+ < C2H4 < C6H6), the ratio of the catalytic activity of TTAB- to PVP-capped nanocubes shows a dramatic increase because TTAB with short alkyl chains provides a larger number of clean Pt atom ensembles for larger reactants. However, similar activity between the two types of nanocubes was measured for a solution-phase reaction (O2NC6H4OH) where the surface-capping agents are able to spread out into solvent media, exposing bare Pt atoms. In this case, the influence of the alkyl length of the surface-capping agent was minimized.

Keywords
Pt nanocubes; Shape control; Surface-capping agent; Reactivity
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Change in the catalytic reactivity of Pt nanocubes in the presence of different surface-capping agents
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 10, Issue 9, 25 April 2009, Pages 1305–1309
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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Price was $35.95
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