Composite Adsorbent “1-Ethyl-3-methylimidazolium Acetate [EMIM] [Ac] into Mesoporous Silica Gel” for Adsorption Heat Storage
Angelo Freni, Elisa Passaglia, Emilia Bramanti, Silvia Pizzanelli, Roberto Spiniello, Francesca Nardelli, Luigi Calabrese, Stefano De Antonellis, Giorgio Tomaino, Alejandro Jose Di Cicco
TL;DR
This paper introduces a new composite material made of an ionic liquid and silica gel that efficiently stores heat through water adsorption.
Contribution
The novel contribution is the development of a composite adsorbent with high thermal storage capacity and structural stability for heat storage systems.
Findings
The composite achieved an adsorption capacity of up to 0.71 g/g at 50 °C and 80% relative humidity.
The material showed full process reversibility and minimal hysteresis in adsorption/desorption cycles.
Thermodynamic analysis confirmed a volumetric heat storage density of 600–920 MJ/m³ at regeneration temperatures below 100 °C.
Abstract
The aim of this work is to prepare and characterize a composite adsorbent comprising the hydrophilic ionic liquid 1-ethyl-3-methylimidazolium acetate [EMIM-Ac] composite supported on mesoporous silica gel for application in adsorption heat storage systems. Water adsorption/desorption isotherms were measured gravimetrically at T = 40, 50, 70 °C across a relative humidity (RH) range of 0–0.8, demonstrating a high adsorption capacity (up to 0.71 g/g at 50 °C and RH = 0.8, for a 50 wt % [EMIM-Ac] loading). Full process reversibility and negligible ad/desorption hysteresis were also verified. Thermal stability of the prepared silica/[EMIM-Ac] composites was confirmed up to approximately T = 200 °C. Structural stability of samples subjected to repeated ad/desorption aging cycles was verified via FT-IR, High-Resolution Solid-State NMR, and Time-Domain NMR spectroscopy. Finally, the…
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Taxonomy
TopicsAdsorption and Cooling Systems · Ionic liquids properties and applications · Carbon Dioxide Capture Technologies