High Pressure Intrusion–Extrusion of LiCl Aqueous Solutions in Silicalite-1 Zeolite: Influence on Energetic Performances

Citations Over TimeTop 10% of 2014 papers

Abstract

The energetic performances of different “Silicalite-1–LiCl aqueous solution” systems were evaluated under high pressure. Depending on the LiCl concentration in the aqueous medium (0 M, 5 M, 10 M, 20 M), an increase of the intrusion and extrusion pressures and therefore of the stored (∼10, ∼13, ∼19, ∼31 J/g) and restored (∼10, ∼13, ∼18, ∼27 J/g) energies are observed. Thus, compared to the “Silicalite-1–water” system, the stored energy is tripled in the case of “Silicalite-1–LiCl 20 M” system. Several characterizations (XRD, TG, NMR, N2 physisorption, ICP/OES, ...) have been realized before and after intrusion–extrusion experiments in order to reveal the presence or the lack of defects and the possible presence of lithium ions in the material after such experiments. At the short-range order, solid state NMR spectroscopy get evidence of the presence of Q2 and Q3 groups revealing the breaking of some siloxane bridges after the intrusion-extrusion steps and thus the creation of hydroxyl groups set in evidence by TG experiments. Only few traces of lithium (1 atom per unit cell) were found by ICP/OES analysis.

Related Papers

• → Ab Initio Investigation of Physisorption of Molecular Hydrogen on Planar and Curved Graphenes(2001)297 cited
• → Theoretical and practical discussion of measurement accuracy for physisorption with micro- and mesoporous materials(2013)62 cited
• → Electronic structure calculations of physisorption and chemisorption on oxide glass surfaces(2005)53 cited
• → Influence of activated carbon surface oxygen functionalities on SO2 physisorption – Simulation and experiment(2013)33 cited
• → High-resolution physisorption techniques for the characterization of adsorbents and catalysts(1991)2 cited