Abstract
Abstract The rates of adsorption and desorption, and the adsorption equilibrium for carbon monoxide chemisorption on zinc oxide were measured over a wide range of temperatures as in the previous study of hydrogen chemisorption on zinc oxide. The behavior of desorption indicated the existence of two types of chemisorption; the non-activated type and the activated type. For the former type the heat of adsorption was estimated as 10∼12 kcal./mol. from the adsorption isotherms, in agreement with the activation energy of desorption. The considerable fraction of the latter type was reversible, i.e. desorbed as such. For this type, the activation energy of adsorption increased with the adsorbed amount from 5 to 16kcal./mol., and the rate was proportional to P0.8∼0.9. Moreover, the heat of adsorption obtained from the adsorption isotherms ranged from 25 to 38 kcal./mol., in fair agreement with those estimated from the activation energy of adsorption and desorption. The behavior of desorption suggested the predominance of surface heterogeneity, the nature of which was such that the activation energy of adsorption and the heat of adsorption varied conversely to each other.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
