caa a22 4500 47584453X CHVBK 20180406123910.0 cr unu---uuuuu 170329e20000501xx s 000 0 eng 10.1023/A:1019157327060 doi (NATIONALLICENCE)springer-10.1023/A:1019157327060 An atomic X-ray absorption fine structure study of the influence of hydrogen chemisorption and support on the electronic structure of supported Pt particles [Elektronische Daten] [D.E. Ramaker, G.E. van Dorssen, B.L. Mojet, D.C. Koningsberger] The physical principles of atomic XAFS (AXAFS) are presented along with important details on how to isolate the AXAFS contribution from the experimental XAFS data. Intuitive illustrations are given showing how various interactions of the absorber atom with its neighbours influence the AXAFS contribution. Hydrogen chemisorbed on the surface of the supported metal particles is shown to have a strong influence on the amplitude of the Fourier transform AXAFS peak. The effect of the support (with different amounts and types of charge compensating ions (H+, K+), different Si/Al ratio and extra-framework Al) on the experimental AXAFS spectra of Pt dispersed in zeolites (LTL,Y) and on flat supports (Al2O3-SiO2, MgO-Al2O3) are summarised. It is shown that the essence of the metal-support interaction, as revealed in the AXAFS, is a shift in the ionisation potential of the valence d-orbital electrons brought about by the polarisation induced primarily by the changing charge on the support oxygen atoms. Kluwer Academic Publishers, 2000 atomic XAFS spectroscopy nationallicence supported platinum catalysts nationallicence metal-support interaction nationallicence Pt electronic structure nationallicence hydrogen chemisorption nationallicence particle size effects nationallicence Ramaker D.E. Department of Chemistry and Materials Science Institute, George Washington University, 20052, Washington, DC, USA aut van Dorssen G.E. Department of Inorganic Chemistry and Catalysis, Debye Institute, Utrecht University, PO Box 80083, 3508 TB, Utrecht, The Netherlands aut Mojet B.L. Department of Inorganic Chemistry and Catalysis, Debye Institute, Utrecht University, PO Box 80083, 3508 TB, Utrecht, The Netherlands aut Koningsberger D.C. Department of Inorganic Chemistry and Catalysis, Debye Institute, Utrecht University, PO Box 80083, 3508 TB, Utrecht, The Netherlands aut Topics in Catalysis Kluwer Academic Publishers 10/3-4(2000-05-01), 157-165 1022-5528 10:3-4<157 2000 10 11244 https://doi.org/10.1023/A:1019157327060 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1019157327060 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ramaker D.E. Department of Chemistry and Materials Science Institute, George Washington University, 20052, Washington, DC, USA aut NATIONALLICENCE 700 1- van Dorssen G.E. Department of Inorganic Chemistry and Catalysis, Debye Institute, Utrecht University, PO Box 80083, 3508 TB, Utrecht, The Netherlands aut NATIONALLICENCE 700 1- Mojet B.L. Department of Inorganic Chemistry and Catalysis, Debye Institute, Utrecht University, PO Box 80083, 3508 TB, Utrecht, The Netherlands aut NATIONALLICENCE 700 1- Koningsberger D.C. Department of Inorganic Chemistry and Catalysis, Debye Institute, Utrecht University, PO Box 80083, 3508 TB, Utrecht, The Netherlands aut NATIONALLICENCE 773 0- Topics in Catalysis Kluwer Academic Publishers 10/3-4(2000-05-01), 157-165 1022-5528 10:3-4<157 2000 10 11244 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer