Platinum has been supported on NaY zeolite by ion exchange of Pt(NH3)4
2+. Clustering of Pt atoms into a 1 nm cluster, and three-dimensional
quantum-size wire (3 nm thick) network (greater than 100 nm) from redu
ction of the Pt species has been investigated by extended X-ray absorp
tion fine structure transmission electron microscopy and xenon adsorpt
ion measurements.