EVALUATION OF THE EXCHANGE PROPERTIES OF A NATURAL MEXICAN ZEOLITE FOR N2-O2 SEPARATION IN THE ATMOSPHERIC AIR

  • J. Flores
  • A. Maubert
  • N. Martín
Keywords: adsorption, N2-O2 separation, natural zeolite, erionite, microporous sorbents

Abstract

The porous structure of a natural mexican zeolite (ErP) was studied by N2 adsorption (77 K), analyzing the data according to the models of Dubinin-Raduskkevich (DR), Langmuir and BET. Structural analysis (SEM-EDS) showed that the main crystalline phase of the samples was erionite (Er) with clinoptilolite in smaller proportions. Samples were exchanged (ErX) with alkaline (X = Li+, Na+, K+, Rb+) and earth-alkaline metals (X = Sr+2, Ca+2, Ba+2 and Mg+2) to evaluate their N2 separation capacities from atmospheric air. In all samples the micropore volume (DR) coincides with the capacity of Langmuir monolayers. Therefore the concept of filling volume is more appropriate for these natural zeolites, which was essentially a microporous adsorbent (76% of micropore content). Chromatographic separation tests showed that ErSr, ErNa, ErCa and ErLi were the adsorbents with the highest capacity of N2-O2
separation in atmospheric air.

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Published
2020-07-14
How to Cite
Flores, J., Maubert, A., & Martín, N. (2020). EVALUATION OF THE EXCHANGE PROPERTIES OF A NATURAL MEXICAN ZEOLITE FOR N2-O2 SEPARATION IN THE ATMOSPHERIC AIR. Revista Mexicana De Ingeniería Química, 5(2), 119-129. Retrieved from http://www.rmiq.org/ojs311/index.php/rmiq/article/view/1894
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