The Role of Organic Capping Layers of Platinum Nanoparticles in Catalytic Activity of CO Oxidation

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We report the catalytic activity of colloid platinum nanoparticles synthesized with different organic capping layers. On the molecular scale, the porous organic layers have open spaces that permit the reactant and product molecules to reach the metal surface. We carried out CO oxidation on several platinum nanoparticle systems capped with various organic molecules to investigate the role of the capping agent on catalytic activity. Platinum colloid nanoparticles with four types of capping layer have been used: TTAB (Tetradecyltrimethylammonium Bromide), HDA (hexadecylamine), HDT (hexadecylthiol), and PVP (poly(vinylpyrrolidone)). The reactivity of the Pt nanoparticles varied by 30%, with higher activity on TTAB ... continued below

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Park, Jeong Y.; Aliaga, Cesar; Renzas, J. Russell; Lee, Hyunjoo & Somorjai, Gabor A. December 17, 2008.

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We report the catalytic activity of colloid platinum nanoparticles synthesized with different organic capping layers. On the molecular scale, the porous organic layers have open spaces that permit the reactant and product molecules to reach the metal surface. We carried out CO oxidation on several platinum nanoparticle systems capped with various organic molecules to investigate the role of the capping agent on catalytic activity. Platinum colloid nanoparticles with four types of capping layer have been used: TTAB (Tetradecyltrimethylammonium Bromide), HDA (hexadecylamine), HDT (hexadecylthiol), and PVP (poly(vinylpyrrolidone)). The reactivity of the Pt nanoparticles varied by 30%, with higher activity on TTAB coated nanoparticles and lower activity on HDT, while the activation energy remained between 27-28 kcal/mol. In separate experiments, the organic capping layers were partially removed using ultraviolet light-ozone generation techniques, which resulted in increased catalytic activity due to the removal of some of the organic layers. These results indicate that the nature of chemical bonding between organic capping layers and nanoparticle surfaces plays a role in determining the catalytic activity of platinum colloid nanoparticles for carbon monoxide oxidation.

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  • Journal Name: Catalysis Letters

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  • Report No.: LBNL-2439E
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 972278
  • Archival Resource Key: ark:/67531/metadc935301

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  • December 17, 2008

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  • Nov. 13, 2016, 7:26 p.m.

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  • Nov. 18, 2016, 3:21 p.m.

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Park, Jeong Y.; Aliaga, Cesar; Renzas, J. Russell; Lee, Hyunjoo & Somorjai, Gabor A. The Role of Organic Capping Layers of Platinum Nanoparticles in Catalytic Activity of CO Oxidation, article, December 17, 2008; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc935301/: accessed July 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.