Na + Charge Tuning through Encapsulation of Sulfur Chromophores in Zeolite A and the Consequences in Adsorbent Properties

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The effect of sulfur chromophores on the Na + cation charge was investigated. Carbon dioxide and methane adsorption into zeolite A were modified by the encapsulation of the chromophores due to the interaction between Na + and S x − ( x = 2 or 3). Indeed, the isotherms and enthalpies of CO 2 and CH 4 depended on the amount of trapped sulfur as well as on the zeolite structure. In this work, we also propose the mechanism of polysulfide formation and structural transformation when the molar ratio S/Na 2 CO 3 = 0.3 and the mechanism of reaction between sulfur and sodium carbonate and diffusion into the LTA (Linde Type A) structure when S/Na 2 CO 3 = 5.0.