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Cr-doped UiO-66 with enhanced water adsorption for adsorption heat transformation.
- Source :
-
Microporous & Mesoporous Materials . Jan2022, Vol. 331, pN.PAG-N.PAG. 1p. - Publication Year :
- 2022
-
Abstract
- In this study, the possible applications of Cr-doped UiO-66 in adsorption heat transformation (AHT) were investigated. Four different Cr-doped UiO-66 samples were prepared to examine their structures and water adsorption properties. Results showed that Cr-doped UiO-66 samples have higher pore volume and specific surface area than pure UiO-66 samples. In particular, 0.2Cr-UiO-66 has the highest BET specific surface area (993 m2/g) and micropore volume (0.50 cm3/g), which are 31.6% and 29.6% higher than those of unmodified UiO-66, respectively. Water adsorption tests revealed that Cr doping can improve the water adsorption performances of UiO-66. At 25 °C and P/P 0 = 0.9, the saturated water uptake of 1.0Cr-UiO-66 is 0.69 g/g, which is 64.3% higher than that of pure UiO-66. After 10 adsorption/desorption cycles, the water adsorption capacity of pure UiO-66 and 0.5Cr-UiO-66 samples has decreased by 3.4% and 5.7%, respectively, indicating their good cycle stability. All these results indicate that Cr doping is beneficial to UiO-66 application in AHT. [Display omitted] • Metal-organic framework UiO-66 were modified with Cr by solvothermal method. • Cr-doped UiO-66 showed enhanced saturated water adsorption capacity and water uptake at low water pressure. • The BET specific surface area of UiO-66 was increased by 31.5% with the addition of Cr. • Water adsorption capacity of 0.5Cr-UiO-66 remains most constant after cycling. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13871811
- Volume :
- 331
- Database :
- Academic Search Index
- Journal :
- Microporous & Mesoporous Materials
- Publication Type :
- Academic Journal
- Accession number :
- 154660731
- Full Text :
- https://doi.org/10.1016/j.micromeso.2021.111642