An Attempt at a More Precise Evaluation of the Approach to Mesopore Size Distribution Calculations Depending on the Degree of Pore Blocking
✍ Scribed by Peter T. Tanev; Lyubomir T. Vlaev
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 370 KB
- Volume
- 160
- Category
- Article
- ISSN
- 0021-9797
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✦ Synopsis
A comparison of literature methods for the calculation of the mesopore size distribution (PSD) is made on the basis of nitrogen adsorption isotherms of aluminum hydroxide, aluminum oxide, and silica gel characterized by well defined (\mathrm{H} 1, \mathrm{H} 2, \mathrm{H} 3), and (\mathrm{H} 4) hysteresis loops. New, more detailed models of various types of mesopore structures are proposed. The corresponding hysteresis loops and PSD curves are considered in terms of different degrees of adsorbate pore blocking. The product of the differences between the prevailing pore neck and void sizes and the spontaneously diffusing volume determined from the two branches of the hysteresis loop is proposed as a quantitative measure of the degree of blocking. Thus, as the degree of blocking increases, the hysteresis loops follow the sequence