Abstract
Abstract Owing to the features of S-shape water sorption isotherm and low desorption temperature, MIL-101(Cr) has been considered as up-and-coming adsorbent for adsorption heat pumps (AHPs). In order to improve water vapor uptake at the low relative pressure (P/P0 ≤ 0.3) for AHPs, a new type of solid adsorbent was fabricated by impregnating porous MIL-101(Cr) with the aqueous solution of hygroscopic salt such as CaCl2 and LiCl. The effect of impregnation salt concentration on hygroscopicity of composite salt-MIL-101(Cr) was discussed. The crystalline phase, pore structure, morphology and the composition of the composites were characterized by X-ray diffraction, pore size analysis, Scanning Electron Microscopy and Energy Dispersive Spectrometry. And their adsorption and desorption performances were evaluated. The experimental results indicated that the composites obtained by dipping MIL-101(Cr) with the solution of 25% CaCl2 and 15% LiCl, exhibited excellent adsorption capacities and fast adsorption rates. Their amounts adsorbed at P/P0 of 0.3 reached 0.44, 0.45 g/g, respectively, which were much higher than the pristine MIL-101(Cr). Additionally, fifty separate adsorption/desorption cycles suggested that the composite had excellent reversibility. All the results indicated that the novel composite salt-MIL-101(Cr) are expected to be a promising candidate for AHPs.
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