Adsorption of Carbon Dioxide on Nickel Single Crystal Surfaces Using a Radiotracer Technique

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Abstract
The adsorption of CO2 (5.8 percent C14O2) on the (110) and (100) faces of a nickel single crystal has been studied, using an adsorption chamber containing a thin window Geiger counter. Maximum adsorption of CO2 takes place on adsorbed residual gas layers of optimum thickness rather than on the clean nickel surface. The CO2-nickel combination has a relatively low rate of adsorption (1.5×1011 molecules per minute for each face). The observed equilibrium adsorption values on the (110) and (100) faces were about equal after 54 hours of outgassing at 985°C. After 32 additional hours of heating at 1085°C, the adsorption on the (110) face was twice that on the (100) face. Possible thermal etching of the (110) face makes the reason for this difference uncertain. At equilibrium on the (110) face, the surface coverage is about 2 percent. The equilibrium adsorption on the (100) face decreases linearly by 80 percent as the temperature is increased from 30°C to 110°C.

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