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Title: CO[2] Sequestration by Natural Zeolite for Greenhouse Effect Control
Authors: Hernandez, Miguel Angel
Pestryakov, Aleksey Nikolaevich
Portillo, Roberto
Salgado, Martha
Rojas, Fernando
Rubio, Efrain
Ruiz, Sinuhe
Petranovskii, Vitalii
Keywords: поглощение; углекислый газ; эрионит; адсорбция
Issue Date: 2015
Publisher: Elsevier
Citation: CO[2] Sequestration by Natural Zeolite for Greenhouse Effect Control / M. A. Hernandez [et al.] // Procedia Chemistry. — 2015. — Vol. 15 : Chemistry and Chemical Engineering in XXI century (CCE 2015) : XVI International Scientific Conference dedicated to Professor L.P. Kulyov, 25-29 May 2015, Tomsk, Russia. — [P. 33-41].
Abstract: This paper describes the adsorption of CO[2] on pores in natural erionite exchanged with aqueous solutions of Na{+}, Mg{2+}, and Ca{2+} salts at different concentrations, variable time and temperature of treatment. Experimental data of CO[2] adsorption were treated by the Freundlich and Langmuir equations. Complementarily were evaluated standard adsorption energies and the degree of interaction of the gas with the zeolite; the evolution of isosteric heats of adsorption was analyzed. The exchange with Na{+} favors the creation of emergent pores thus causing an increase of the adsorption capacity for CO[2]. The presence of Na{+} at micropore entrances causes an increased adsorption into the nanocavities and on the external area of the ion-exchanged zeolites. The development of nanopores in erionite was evaluated through the Barrett-Joyner-Halenda and NLDFT methods. Depending on the conditions of the exchange treatment, Na{+} was found to be most favorable, well distributed, and accessible for N[2] adsorption.
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