Abstract
Due to the nanoporous nature of zeolitic materials, they can be used as gas adsorbents. This paper describes the effect of critical admission temperature through narrow pores of natural ERI zeolites at low levels of coverage. This phenomenon occurs by adsorption of CH4 and H2 on pores in natural erionite. The zeolite was exchanged with aqueous solutions of Na+, Mg2+, and Ca2+ salts at different concentrations, times, and temperatures of treatment. Experimental data of CH4 and H2 adsorption were treated by the Langmuir equation. Complementarily, the degree of interaction of these gases with these zeolites was evaluated by the evolution of isosteric heats of adsorption. The Ca2+ and Mg2+ cations favor the adsorption phenomena of H2 and CH4. These cations occupy sites in strategic positions Ca1, Ca2, and Ca3, which are located in the nanocavities of erionite zeolites and K2 in the center of 8MR. Following the conditions of temperature and the exchange treatment, ERICa2 and ERINa3 samples showed the best behavior for CH4 and H2 adsorption.
Highlights
It has already been established that greenhouse gases contribute significantly to global warming
These nanostructures, endowed with small pores, are especially relevant for capturing greenhouse gases from large emission sources. Such nanostructures could be potentially used both to reduce the energy fuels demand for achieving the separation of greenhouse gases, i.e., CH4, H2, or CO2 from flue gas [5], and to find an alternative to the storage of hydrogen and methane, since these gases are a source of clean energies [6,7]
Zeolites are classified by the International Zeolite Association (IZA) according to the size of their channels, which are related with the number of atoms or members in the rings
Summary
It has already been established that greenhouse gases contribute significantly to global warming. Note that kinetic diameters (σ, nm) of the adsorptive molecules [27] are comparable to the sizes of the pore openings delimited by eight atoms in the erionite crystal structure [28,29].
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