Peculiarities of high-pressure hydrogen adsorption on Pt catalyzed Cu-BTC metal-organic framework

Hydrogen adsorption ability is a key parameter characterizing advanced porous materials. Herein, the influence of platinum catalyst on the interaction of Cu-BTC with hydrogen is thoroughly investigated using volumetric measurements, calorimetric titration, XRD, and IR- and EPR spectroscopy. The firs...

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Bibliographic Details
Published in:Physical chemistry chemical physics : PCCP 2021-02, Vol.23 (7), p.4277-4286
Main Authors: Chuvikov, S. V, Berdonosova, E. A, Krautsou, A, Kostina, J. V, Minin, V. V, Ugolkova, E. A, Klyamkin, S. N
Format: Article
Language:English
Subjects:
Adsorption
Catalysts
Chemical reactions
Copper
Hydrogen
Infrared spectroscopy
Metal-organic frameworks
Platinum
Porous materials
Titration
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Summary:Hydrogen adsorption ability is a key parameter characterizing advanced porous materials. Herein, the influence of platinum catalyst on the interaction of Cu-BTC with hydrogen is thoroughly investigated using volumetric measurements, calorimetric titration, XRD, and IR- and EPR spectroscopy. The first hydrogen adsorption by the Cu-BTC + Pt/C composite leads to an irreversible chemical reaction related to the formation of structural defects during synthesis. This process results in a partial reduction of Cu 2+ to Cu 0 and is accompanied by a decrease in the specific surface area and the appearance of additional mesopores. The following hydrogen adsorption-desorption cycles are completely reversible and reproducible. Besides, the Pt-containing material maintains a positive trend in excess adsorption up to ultra-high pressures in contrast with pristine Cu-BTC. Above 300-400 bars, it demonstrates a significant superiority in hydrogen capacity over the catalyst-free MOF. The possible nature of such a peculiar phenomenon is suggested. Pt-Catalyst plays a key role in hydrogen adsorption by Cu-BTC at high pressures.
ISSN:1463-9076
1463-9084
DOI:10.1039/d0cp03900d