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Experimental study on salt–metal organic framework composites for water absorption.
- Source :
-
Inorganica Chimica Acta . Jan2020, Vol. 500, pN.PAG-N.PAG. 1p. - Publication Year :
- 2020
-
Abstract
- Water absorption by the composite adsorbent includes physical adsorption of moisture by MIL-101(Cr), chemical reaction of CaCl 2 with water molecules to form hydrates, and absorption of water vapor by CaCl 2 solution. • The XRD analysis shows that the structure of the MIL-101(Cr) material does not change after the addition of CaCl 2. • The water vapor equilibrium adsorption capacities of MIL-101(Cr)/CaCl 2 -20% is 1.13 g/g without agglomeration when P/P 0 = 0.9. • MIL-101(Cr)/CaCl 2 -20% has great potential for application to adsorption heat pumps. In this article, MIL-101(Cr) powder material was successfully prepared by hydrothermal synthesis and combined with different mass fractions of CaCl 2 by immersion method to obtain MIL-101(Cr)/CaCl 2 composite materials. The physical properties of the adsorbent were determined by X-ray powder diffraction, N 2 adsorption/desorption isotherm, TGA and FTIR. The water vapor adsorption performance of MOFs was tested by a gravimetric instrument to analyze the underlying mechanism. Results indicated that the specific surface area, total pore volume, and pore size distribution of micropores and mesopores of MIL-101(Cr)/CaCl 2 composites decreased with increasing CaCl 2 content. When P/P 0 = 0.9, the water vapor equilibrium adsorption capacities of MIL-101(Cr), MIL-101(Cr)/CaCl 2 -10%, MIL-101(Cr)/CaCl 2 -20%, and MIL-101(Cr)/CaCl 2 -30% were 1.05, 0.88, 1.13, and 1.35 g/g, respectively. MIL-101(Cr)/CaCl 2 -30% agglomerated after water absorption, so MIL-101(Cr)/CaCl 2 -20% was selected as the final experimental material. The water vapor adsorption heat of MIL-101(Cr)/CaCl 2 -20% was 42–58 kJ/mol, which is close to the evaporation enthalpy of water (44 kJ/mol at 25 °C). The analysis of the adsorption kinetics showed the relatively uniform adsorption rate of MIL-101(Cr)/CaCl 2 -20%. Overall, MIL-101(Cr)/CaCl 2 -20% exhibited superior water vapor adsorption performance and have great potential for application to adsorption heat pumps. [ABSTRACT FROM AUTHOR]
- Subjects :
- *PHYSISORPTION
*ADSORPTION kinetics
*PORE size distribution
*WATER vapor
*ABSORPTION
Subjects
Details
- Language :
- English
- ISSN :
- 00201693
- Volume :
- 500
- Database :
- Academic Search Index
- Journal :
- Inorganica Chimica Acta
- Publication Type :
- Academic Journal
- Accession number :
- 141605755
- Full Text :
- https://doi.org/10.1016/j.ica.2019.119214