Dynamic Laser Speckle Technique as an alternative tool to determine hygroscopic capacity and specic surface area of microporous zeolites

RUTH DARY MOJICA SEPÚLVEDA; LUIS JOAQUIN MENDOZA HERRERA; EDUARDO E. GRUMEL; DELIA B. SORIA; CARMEN I. CABELLO; MARCELO R. TRIVI

APPLIED SURFACE SCIENCE

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2018

0169-4332

Adsorption phenomena have several technological applications such as desiccants,catalysts, separation of gases, etc. Their uses depend on the texturalproperties of the solid adsorbent and the type of the adsorbed liquid or gas.Therefore, it is important to determine these properties. The most commonmeasurement methods are physicochemical based on adsorption of N2 to determinethe surface area and the distribution of pores size. However thesetechniques present certain limitations for microporous materials. In this paperwe propose the use of the Dynamic Laser Speckle (DLS) technique to measurethe hygroscopic capacity of a microporous natural zeolite and their modiedforms. This new approach based on the adsorption of water by solids allowsdetermine their specic surface area (S). To test the DLS results, we comparedthe obtained S values to those calculated by dierent conventional isothermsusing the N2 adsorption-desorption method.