Abstract
A new method has been devised for detecting the heat evolved when
a gas is adsorbed onto a crystal surface. The method forms the basis
of an adsorption calorimeter which provides, for the first time,
accurate heats of adsorption for adsorbates on metal single crystal
surfaces as a detailed function of surface coverage. Coverage-dependent
calorimetric heats of adsorption and sticking probabilities for CO
on the 111 100 and 110 planes of nickel have been obtained,
enabling comparisons to be made with literature values for isosteric
heats. Data for CO adsorption onto nickel surfaces with varying amounts
of predosed K have been obtained, demonstrating an unexpectedly large
effect of promotion on the heat of adsorption
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