Abstract
New methods of pore structure analysis have made a complete analysis of the pore systems of solids possible. Nitrogen adsorption-desorption isotherms have been used in the analysis to date. There are many important adsorbents that have part of their pore systems, often the major part, inaccessible to nitrogen but accessible to water vapor. The methods used for complete analysis are equally applicable for both adsorbates, but a prerequisite to the use of water vapor is to have t-curves, i.e., curves that give the statistical thickness of the film adsorbed on nonporous adsorbents as a function of the relative pressure. Several t-curves were published for nitrogen, but the first t-curves for water vapor are those presented in this paper. The thickness of the adsorbed film at a given relative pressure depends on the heat of adsorption; consequently, the t-curve to be used is that which matches the heat of adsorption of water on the adsorbent to be analyzed. The C constant of the BET equation is an adequate measure of the heat of adsorption for the purpose of the analysis. Several t-curves are offered, depending on the C constants.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: 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.