Alcohol Oxidation at Platinum-Gas and Platinum-Liquid Interfaces The Effect of Platinum Nanoparticle Size, Water Coadsorption, and Alcohol Concentration /

Alcohol oxidation reaction over platinum nanoparticles with size ranging from 2 to 8 nm deposited on mesoporous silica MCF-17 was studied in the gas and liquid phases. Among methanol, ethanol, 2-propanol, and 2-butanol oxidations, the turnover frequency increased as the nanoparticle size became larg...

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Bibliographic Details
Main Authors: Tatsumi Hironori
Liu Fudong
Han Hui-Ling
Carl Lindsay M.
Sápi András
Somorjai Gábor A.
Format: Article
Published: 2017
Series:JOURNAL OF PHYSICAL CHEMISTRY C 121 No. 13
doi:10.1021/acs.jpcc.7b01432

mtmt:3273836
Online Access:http://publicatio.bibl.u-szeged.hu/16504
Description
Summary:Alcohol oxidation reaction over platinum nanoparticles with size ranging from 2 to 8 nm deposited on mesoporous silica MCF-17 was studied in the gas and liquid phases. Among methanol, ethanol, 2-propanol, and 2-butanol oxidations, the turnover frequency increased as the nanoparticle size became large in both reaction phases. The activation energy in the gas phase was higher than that in the liquid phase. Water coadsorption decreased the turnover rate of all the gas and liquid phase oxidations except for the gas-phase 2-butanol case, while a certain amount of water promoted 2-propanol oxidation in the liquid phase. Sum frequency generation vibrational spectroscopy study and DFT calculation revealed that the alcohol molecules pack horizontally on the metal surface in low concentration and stand up in high concentration, which affects the dissociation of beta-hydrogen of the alcohol as the critical step in alcohol oxidation.
Physical Description:7365-7371
ISSN:1932-7447