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58 CHAPTER 4
V T9g (X _ y2 )
H2 2
9 g (z2) 9(z2)
g
~ ~
C 2 H 4
9(z2) 9 g (z2) 9(Z 2)
g
g
[ 100)
A 9g(x2-l)
H2 ~
9 g (z2) 9 g (z2)
[110 1
NONE COPLANAR
Figure 4.9. Modes of adsorption for hydrogen and ethylene on nickel.
TABLE 4.3. Differences
in Crystal Planes
Ammonia Synthesis 11(7)
Plane Activity
[ 100] 21
[110)
llll] 440