Abstract
The adsorptive characteristics of zirconium oxide have been investigated by studying the adsorption of nitrogen, argon, and water. Surface properties were found to depend primarily on the amount of irreversibly adsorbed water retained by the sample. Water was found to irreversibly adsorb on zirconium oxide in amounts far in excess of that required for a classical chemisorbed monolayer. Weight loss for the sample between 25° and 500°C, in vacuum, was equivalent to 2.3 monolayers of chemisorbed water. Replacement of this water by adsorption from the vapor phase at 25°C because prohibitively slow after the irreversible adsorption of about 1.3 monolayers of water. In contrast to this, it was relatively easy to obtain reversible water vapor isotherms at 300° and 400°C. All three adsorbates showed that this sample of zirconium oxide has a pore system spanning the micro to macro size range. Irreversible adsorption of water caused a 20% decrease in the specific surface area as measured by nitrogen and argon. This reduction is real and occurs through the filling of micropores by irreversibly adsorbed water. Specific surface areas calculated from the water data suffer from the specificity of the interaction of water with the oxide surface and do not provide a true measure of the geometric area.
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.
