Influence on textural values of nanoporous materials by using different gases at 77 K

JHONNY VILLARROEL-ROCHA; DEICY BARRERA; KARIM SAPAG

Ottawa

Simposio; 8th International Symposium on NANOPOROUS MATERIALS (NANO-8); 2017

The most widely used experimental technique to determine textural properties ofporous materials is the gas adsorption, where the most used adsorptive is N2 at 77K. However, researchers argue that the quadrupole moment of the N2 moleculeexhibits specific interactions with the surface silanol groups present in silicamaterials (like ordered mesoporous materials silica, OMMS), generating apreferential orientation effect on the N2 molecule adsorbed. In this sense, the study of the adsorption of other vapors or gases would be useful tocomplement the information of the texture and/or structure of the OMMS.In this work, the N2, Ar, O2, CH4 and H2 at 77 K adsorption on MCM-41, MCM-48, SBA-15 and SBA-16 are presented where several methods/models macroscopic (DR, αS-plot, Gurvich rule, BJH and VBS) or microscopic (NLDFT and GCMC) were used, in order to complete the information about their texture and pore structure.