Characterization of CO- and H-2-adsorbed Au6Pt-phosphine clusters supported on SiO2 by EXAFS, TPD, and FTIR
作者： Youzhu Yuan , Kiyotaka Asakura , Huilin Wan , Khirui Tsai , Yasuhiro Iwasawa
DOI: 10.1246/BCSJ.72.2643
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摘要: The adsorption of CO and H2 on a SiO2-supported Au6Pt cluster [(AuPPh3)6Pt(PPh3)](NO3)2 (1) has been studied by means FTIR, TPD, EXAFS. adsorbed 1/SiO2 to form CO-adduct complex, which exhibited an IR band at ca. 1972 cm−1. was desorbed below 403 K, showing peak maximum 363 K in TPD. There little change the coordination number Pt–Au Pt L3-edge EXAFS upon adsorption, but Au–Au Au slightly increased ascribed Pt–(Au)–P Fourier transform remarkably increased. increase intensity interpreted multiple scattering effect owing Pt–Au–P bond angle. original oscillations both L3-edges were regenerated after evacuation CO-adsorbed sample for 2 h 353 indicating recovery structure. This is entirely different from case 1 solution, where cl...
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