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Confalonieri G, Ryzhikov A, Arletti R, et al. Structural interpretation of the energetic performances of a pure silica LTA-type zeolite. Phys Chem Chem Phys. 2020;22(9):5178-5187doi: 10.1039/c9cp06760d.
Confalonieri, G., Ryzhikov, A., Arletti, R., Quartieri, S., Vezzalini, G., Isaac, C., Paillaud, J. L., Nouali, H., & Daou, T. J. (2020). Structural interpretation of the energetic performances of a pure silica LTA-type zeolite. Physical chemistry chemical physics : PCCP, 22(9), 5178-5187. https://doi.org/10.1039/c9cp06760d
Confalonieri, Giorgia, et al. "Structural interpretation of the energetic performances of a pure silica LTA-type zeolite." Physical chemistry chemical physics : PCCP vol. 22,9 (2020): 5178-5187. doi: https://doi.org/10.1039/c9cp06760d
Confalonieri G, Ryzhikov A, Arletti R, Quartieri S, Vezzalini G, Isaac C, Paillaud JL, Nouali H, Daou TJ. Structural interpretation of the energetic performances of a pure silica LTA-type zeolite. Phys Chem Chem Phys. 2020 Mar 04;22(9):5178-5187. doi: 10.1039/c9cp06760d. PMID: 32083620.
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Phys Chem Chem Phys. 2020 Mar 04;22(9):5178-5187. doi: 10.1039/c9cp06760d.

Structural interpretation of the energetic performances of a pure silica LTA-type zeolite.

Physical chemistry chemical physics : PCCP

Giorgia Confalonieri, Andrey Ryzhikov, Rossella Arletti, Simona Quartieri, Giovanna Vezzalini, Carole Isaac, Jean-Louis Paillaud, Habiba Nouali, T Jean Daou

Affiliations

  1. Dipartimento di Scienze Chimiche e Geologiche (DSCG), Università di Modena e Reggio Emilia, Italy. [email protected].
  2. Université de Haute Alsace (UHA), Axe Matériaux à Porosité Contrôlée (MPC), Institut de Science des Matériaux de Mulhouse (IS2M), Mulhouse, France. [email protected] and Université de Strasbourg, Strasbourg, France.
  3. Dipartimento di Scienze Matematiche e Informatiche, Scienze Fisiche e Scienze della Terra, Università di Messina, Messina S. Agata, Italy.

PMID: 32083620 DOI: 10.1039/c9cp06760d

Abstract

The high pressure intrusion-extrusion process of different electrolyte aqueous solutions (NaCl and CaCl2, 2 M and 3 M) in a hydrophobic pure-silica LTA zeolite was investigated for energetic purposes by means of in situ X-ray powder diffraction, porosimeter tests, thermogravimetric analysis and NMR spectroscopy. The intrusion pressure of the saline solutions was proved to be higher than that of pure water, with the highest value measured for CaCl2, thus increasing the energetic performance of the system. The intrusion of NaCl solutions was irreversible (bumper behavior), whereas that of CaCl2 solutions is partially reversible (shock absorber behavior). The structural investigation allowed interpreting these results on the basis of the different intrusion mechanisms, in turn induced by the different nature of the cations present in the electrolyte solutions. When Si-LTA is intruded by NaCl solution, firstly H2O molecules penetrate the pores, leading to higher silanol defect formation followed by the solvated ions. With CaCl2, instead, due to a higher solvation enthalpy of Ca2+, a higher pressure is required for intrusion, and both H2O and ions penetrate at the same pressure. The structural refinements demonstrate (i) a different arrangement of the extraframework species in the two systems, (ii) the intrusion of the salt solutions occurs through strong desolvation of the ions and (iii) the salt/H2O ratios of the intruded species are higher than those of the starting electrolyte solutions.

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