Abstract
The interaction of N
2
, H
2
, CO, C
2
H
4
, C
2
H
2
and O
2
with clean evaporated films of some twenty metals has been investigated between 0 and – 183° C. The results are expressed as gas chemisorbed or gas not chemisorbed. O
2
chemisorption is universal among all the metals studied, with the single exception of Au. Chemisorption of N
2
and H
2
is limited to transition metals and alkaline earth metals, and chemisorption of CO, C
2
H
4
and C
2
H
2
to these and to Al, Cu and Au. O
2
chemisorption is believed to take place with formation of O
2-
ions at the surface, with electron donation from the
s
and
p
bands of the metals. The inactivity of Au towards O
2
is, however, only partly understandable in terms of this mechanism . The remaining five gases are believed to form covalent bonds with the metal
d
bands in chemisorption; with Cu and Au it is suggested that
d
–
s
promotion takes place in the act of chemisorption to allow such covalence. Al is exceptional, and with the light metals,
s
and
p
band electrons may be active in chemisorption: a further exception is the interaction of K with C
2
H
2
. Some applications of these results to catalytic systems are discussed.
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