Chemisorption of H2 on supported Pt clusters probed by129Xe NMR |
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| Authors: | M Boudart R Ryoo G P Valenç R Van Grieken |
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| Affiliation: | (1) Department of Chemical Engineering, Stanford University, 94305 Stanford, CA, USA;(2) Department of Chemistry, Center for Molecular Science, Korea Advanced Institute of Science and Technology, Taeduk Science Town, 305-701 Taejon, Korea;(3) Present address: Instituto de Pesquisas Espaciais, LACP/INPE, Rod. Pres. Dutra km 40, 12630 Cachoeira Paulista SP, Brazil;(4) Departamento de Ingenieria Química, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Ciudad Universitaria, 28040 Madrid, Spain |
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| Abstract: | The surface of Pt clusters with average size between 1 and 8 nm supported on SiO2,  -Al2O3 or Y-zeolite was probed by129Xe NMR as the Pt surface coverage with hydrogen,  , was increased. A distinct change in the structure of the hydrogen overlayer at  0.3 was inferred from the NMR spectra. This change is believed to take place when the chemisorbed hydrogen fills all the next nearest neighbor metal sites and the nearest neighbors start to be occupied. These new observations clarify previously reported determinations of the average number of Pt atoms in supported clusters by means of Xe NMR and other techniques. It also appears that interfacial metal-support interactions may be probed by Xe NMR. |
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| Keywords: | Chemisorption of H2 on Pt Xe NMR metal-support interaction |
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