caa a22 4500 475843908 CHVBK 20180406123908.0 cr unu---uuuuu 170329e20001201xx s 000 0 eng 10.1023/A:1009094613850 doi (NATIONALLICENCE)springer-10.1023/A:1009094613850 Adsorbate-induced restructuring and pressure-dependent adsorption on metal nanoparticles studied by electron microscopy and sum frequency generation spectroscopy [Elektronische Daten] [Günther Rupprechter, Hans-Joachim Freund] Several examples are presented that illustrate how the internal and surface structure of oxide supported Pt nanoparticles can change under reaction conditions. High temperatures and the presence of adsorbates may lead to different effects: (1) changes in the particle size distribution (sintering or redispersion) that may affect the crystallographic and electronic structure of the nanoparticles, (2) restructuring of the particle surface facets, and (3) crystallization of large polycrystalline aggregates. Three different model systems are described that are well-suited for high resolution transmission electron microscopy (HRTEM) and/or surface science techniques. To examine the influence of high gas pressure on the structure of adsorbates, infrared-visible sum frequency generation (SFG) surface vibrational spectroscopy is applied to monitor CO adsorption on supported Pd nanoparticles from 10-7 to 200 mbar. The adsorption site occupancy of CO, in particular the on-top population, strongly depends on pressure and temperature preventing a simple extrapolation of low pressure results to reaction conditions. Plenum Publishing Corporation, 2000 platinum nationallicence palladium nationallicence alumina nationallicence silica nationallicence nanoparticles nationallicence electron microscopy nationallicence sum frequency generation nationallicence carbon monoxide nationallicence adsorption nationallicence vibrational spectroscopy nationallicence high pressure nationallicence Rupprechter Günther Chemical Physics Department, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195, Berlin, Germany aut Freund Hans-Joachim Chemical Physics Department, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195, Berlin, Germany aut Topics in Catalysis Kluwer Academic Publishers-Plenum Publishers 14/1-4(2000-12-01), 3-14 1022-5528 14:1-4<3 2000 14 11244 https://doi.org/10.1023/A:1009094613850 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1009094613850 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Rupprechter Günther Chemical Physics Department, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195, Berlin, Germany aut NATIONALLICENCE 700 1- Freund Hans-Joachim Chemical Physics Department, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195, Berlin, Germany aut NATIONALLICENCE 773 0- Topics in Catalysis Kluwer Academic Publishers-Plenum Publishers 14/1-4(2000-12-01), 3-14 1022-5528 14:1-4<3 2000 14 11244 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer