Carbon-13 NMR Spectroscopy Study of L-Zeolite- and Silica-Supported Platinum Catalysts

NMR studies of CO adsorbed on small Pt particles show evidence of changes in the metallic nature of these particles with size. Large particles on silica or the exterior of zeolite crystallites have conduction-band electrons that cause a Knight shift for adsorbed CO. Small particles in zeolite caviti...

Full description

Saved in:
Bibliographic Details
Published inJournal of catalysis Vol. 150; no. 2; pp. 225 - 233
Main Authors Sharma, S.B., Laska, T.E., Balaraman, P., Root, T.W., Dumesic, J.A.
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier Inc 01.12.1994
Elsevier
Subjects
Chemistry
Exact sciences and technology
General and physical chemistry
Solid-gas interface
Surface physical chemistry
Inorganic adsorbate
Binary compound
Particle size
Transition metal
NMR spectrometry
Experimental study
Supported catalyst
Gas solid adsorption
Platinum
Gas solid interface
Metallic adsorbent
Adsorption structure
Carbon monoxide
Online AccessGet full text

Cover

More Information
Summary:NMR studies of CO adsorbed on small Pt particles show evidence of changes in the metallic nature of these particles with size. Large particles on silica or the exterior of zeolite crystallites have conduction-band electrons that cause a Knight shift for adsorbed CO. Small particles in zeolite cavities are diamagnetic clusters, and yield spectra for linear and bridging carbonyls similar to those of transition-metal cluster compounds. 13C NMR of CO offers a simple probe of metal dispersion and particle size for these Pt catalysts and other noble metal systems.
ISSN:0021-9517
1090-2694
DOI:10.1006/jcat.1994.1340