Journal
JOURNAL OF SURFACE INVESTIGATION
Volume 13, Issue 5, Pages 787-792Publisher
PLEIADES PUBLISHING INC
DOI: 10.1134/S1027451019050173
Keywords
UiO-66; MOF-801; UiO-66-NDC; metal-organic framework; hydrogen storage; adsorbent; porous material
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Funding
- Ministry of Education and Science of the Russian Federation [16.3871.2017/4.6]
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Metal-organic UiO-66, UiO-66-NDC, and MOF-801 frameworks (MOFs) are produced via the solvothermal synthesis technique. The frameworks are composed of Zr6O4(OH)(4) clusters that are connected with appropriate linkers, as follows: UiO-66-terephthalic acid; UiO-66-NDC-1,4-naphthalenedicarboxilic acid; and MOF-801-fumaric acid. The single-phase composition of the samples is confirmed by X-ray powder diffraction. The identification of Zr6O4(OH)(4) clusters in all the synthesized MOFs is established using X-ray adsorption spectroscopy. The specific surface areas of UiO-66, UiO-66-NDC, and MOF-801 are evaluated, and their hydrogen adsorption-desorption isotherms are measured at 77 K, as well. Comprehensive preliminary characterization of the samples, together with hydrogen-storage-capacity data, allows one to make the following conclusions: (i) at relatively high pressures, the highest hydrogen-storage capacity is found for UiO-66 with the largest specific surface area; (ii) at relatively low pressures, MOF-801 with the smallest pores possesses the optimal structure for hydrogen sorption; (iii) a large pi-system of aromatic UiO-66-NDC rings yields effective hydrogen sorption at low pressures, which is retained in pores during desorption.
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