Applicability of classical methods of pore size analysis for MCM-41 and SBA-15 silicas |
| |
Authors: | J Choma M Jaroniec |
| |
Institution: | a Institute of Chemistry, Military Technical Academy, Kaliskiego 2, 00-908 Warsaw, Poland b Department of Chemistry, Kent State University, Kent, OH 44242, USA |
| |
Abstract: | Two most popular ordered mesoporous silicas, MCM-41 and SBA-15, exhibiting uniform mesopores of approximately cylindrical shapes, have been used as model adsorbents for verification, improvement and/or development of adsorption-based methods for characterization nanoporous materials. While the applicability of the classical methods for pore size analysis was widely examined by employing MCM-41 materials, the large-pore materials such as SBA-15 did not find adequate usage for this type of studies. The current work addresses the issue of applicability of classical methods such as Barrett-Joyner-Hallenda (BJH) and Broekhoff-de Boer (BdB) methods for pore size analysis of mesoporous silicas by using MCM-41 and SBA-15 materials as model adsorbents. In addition, the Kruk-Jaroniec-Sayari (KJS) method, which is based on the BJH algorithm and experimental relations for the pore width and statistical film thickness, is discussed too. While the MCM-41 materials cover the range of small mesopores (about 2-7 nm), the inclusion of SBA-15 materials allowed us to examine the range of the pore diameters up to about 12 nm. The high quality MCM-41 and SBA-15 samples are used to discuss the applicability and limitations of the aforementioned characterization methods and to propose some recommendations for pore size analysis of these materials. |
| |
Keywords: | MCM-41 SBA-15 Nitrogen adsorption Ordered mesoporous silica Pore size analysis |
本文献已被 ScienceDirect 等数据库收录! |
|