Zirconium-Based Metal-Organic UiO-66, UiO-66-NDC and MOF-801 Frameworks. Influence of the Linker Effect on the Hydrogen Sorption Efficiency


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Аннотация

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 π-system of aromatic UiO-66-NDC rings yields effective hydrogen sorption at low pressures, which is retained in pores during desorption.

Авторлар туралы

K. Vetlitsyna-Novikova

International Research Institute of Smart Materials, Southern Federal University

Хат алмасуға жауапты Автор.
Email: kristinavetlitsyna@gmail.com
Ресей, Rostov-on-Don, 344090

V. Butova

International Research Institute of Smart Materials, Southern Federal University

Хат алмасуға жауапты Автор.
Email: butovav86@gmail.com
Ресей, Rostov-on-Don, 344090

I. Pankin

International Research Institute of Smart Materials, Southern Federal University; Department of Chemistry and NIS Interdepartmental Center, University of Torino

Email: butovav86@gmail.com
Ресей, Rostov-on-Don, 344090; Torino, I-10125

V. Shapovalov

International Research Institute of Smart Materials, Southern Federal University

Email: butovav86@gmail.com
Ресей, Rostov-on-Don, 344090

A. Soldatov

International Research Institute of Smart Materials, Southern Federal University

Email: butovav86@gmail.com
Ресей, Rostov-on-Don, 344090

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