Pd8Ni92 (111) and (110) surfaces have been investigated using X-ray ph
otoelectron spectroscopy and low energy ion scattering. As expected, a
high rate of Pd segregation is observed on both faces leading to Fd s
urface concentrations of 76 and 81 at.% on the (111) and (110) surface
s, respectively. The catalytic performances of these surfaces have bee
n studied for the 1,3-butadiene hydrogenation reaction. The catalytic
activity of these alloys is greatly enhanced relative to that of the p
ure Fd(lll) and (110) surfaces. (C) 1998 Published by Elsevier Science
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