K Kato et al 2009 J. Phys.: Conf. Ser. 190 012170 doi:10.1088/1742-6596/190/1/012170
K Kato1,2, K Okumura2, T Sanada2, T Murakami2, S Ito2 and M Niwa2
Show affiliationsDynamical change of structure of Rh supported on H-USY and Na-USY zeolite was measured by Quick XAFS technique operated under in situ conditions. In the atmosphere of H2, formation of the Rh clusters consist of 13 atoms was observed in H-USY and Na-USY. On the other hand, in the atmosphere of O2, formation of the highly dispersed Rh oxide was observed in H-USY, whereas Rh oxide species did not disperse in Na-USY. In the reduction processes after heating samples in the atmosphere of O2, the highly dispersed metal Rh particles in the H-USY agglomerated with increasing temperature above 553K. Whereas, the generation of stable Rh clusters were observed on the Na-USY. From these finding, it was conclude that the structure and acid sites of USY affected on the dispersion of Rh oxide particles and the generation of metal Rh clusters.
Issue 1 (2009)
K Kato et al 2009 J. Phys.: Conf. Ser. 190 012170
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