Selective Amplification of CO Bond Hydrogenation on Pt/TiO2: Catalytic Reaction and Sum‐Frequency Generation Vibrational Spectroscopy Studies of Crotonaldehyde Hydrogenation1. (19th February 2014)

• Record Type: Journal Article
• Authors: Kennedy, Griffin; Baker, L. Robert; Somorjai, Gabor A.
• Is Part Of: Angewandte Chemie. Volume 126:Number 13(2014)
• Page Start: 3473
• Page End: 3476
• Publication Date: 2014-02-19
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201400081
• Languages: English
• ISSNs: 0044-8249

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>The hydrogenation of crotonaldehyde in the presence of supported platinum nanoparticles was used to determine how the interaction between the metal particles and their support can control catalytic performance. Using gas‐phase catalytic reaction studies and in situ sum‐frequency generation vibrational spectroscopy (SFG) to study Pt/TiO₂ and Pt/SiO₂ catalysts, a unique reaction pathway was identified for Pt/TiO₂, which selectively produces alcohol products. The catalytic and spectroscopic data obtained for the Pt/SiO₂ catalyst shows that SiO₂ has no active role in this reaction. SFG spectra obtained for the Pt/TiO₂ catalyst indicate the presence of a crotyl‐oxy surface intermediate. By adsorption through the aldehyde oxygen atom to an O‐vacancy site on the TiO₂ surface, the CO bond of crotonaldehyde is activated, by charge transfer, for hydrogenation. This intermediate reacts with spillover H provided by the Pt to produce crotyl alcohol.</p> </abstract>