XAFS study of the additive cation effect on the oxidation-resistance of platinum catalyst.
The additive cation effect on the oxidation-resistance of platinum supported on alumina was investigated by Pt L(III) and L(II)-edge XAFS. The white line intensity at Pt L(III)-edge of oxidized catalysts decreased with an increase in the electronegativity of the additive cation in the same way as the support effect previously reported: The addition of electrophilic cations make the supported platinum less oxidized state compared with the original Pt/Al2O3 and vice versa. Thus, it was revealed that the addition of more electrophilic cations provides the higher oxidation-resistance to platinum catalyst, even when platinum is supported on basic oxides.
Yazawa
Y
Y
Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Japan. y_yazawa@mbox.media.nagoya-u.ac.jp
Yoshida
H
H
Hattori
T
T