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

被引：63

作者：

Kim, Cheonghee ^{[1
]}

Lee, Hyunjoo ^{[1
]}

机构：

[1] Yonsei Univ, Dept Chem & Biomol Engn, Specialized Grad Sch Hydrogen & Fuel Cell, Seoul 120749, South Korea

来源：

CATALYSIS COMMUNICATIONS | 2009年 / 10卷 / 09期

关键词：

Pt nanocubes; Shape control; Surface-capping agent; Reactivity; SELECTIVE HYDROGENATION; PLATINUM NANOPARTICLES; SINGLE-CRYSTAL; NANOCRYSTALS; CINNAMALDEHYDE; OXIDATION; PALLADIUM; NANORODS; GROWTH;

D O I：

10.1016/j.catcom.2009.02.013

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：1305 / 1309

页数：5

共 22 条

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