Hydrogen storage properties of mono- and bidentate MOF structured orotate complexes
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Dursun Ali Kose Department of Chemistry, Hitit University, 19030 Corum, Turkey
Abdurrahman Asan Department of Chemical Engineering, Hitit University, 19030 Corum, Turkey
Banu Ozturk Department of Chemistry, Hitit University, 19030 Corum, Turkey
Omer Andac
Department of Chemistry, Ondokuz Mayıs University, 55139 Samsun, Turkey
Goksel Ozkan Department of Chemical Engineering, Gazi University, 06520 Ankara, Turkey (Received 3 August 2013; accepted 18 November 2013)
One of the barriers for wide usage of hydrogen energy system is efficient storage. To store more hydrogen efficiently, physisorption is a choice among the others with high storage performance, reversibility, and lifecycles. Metal organic framework (MOF) structured organometallic orotate-Co(II) complexes could serve as sorbents which store hydrogen by physisorption. In this work, mono- and bidentate MOF structured orotate-Co(II) complexes are synthesized, characterized, and then investigated for hydrogen storage experimentally and theoretically. It is found that these compounds could store hydrogen. Especially, the monodentate complex could uptake hydrogen better than the other. Storage performances for mono- and bidentate complexes were 0.80 and 1.15 wt% at 77 K and approximately 80 bars experimentally, 1.03 and 1.16 wt% theoretically for the same conditions.
I. INTRODUCTION
In the last decade, many researchers emphasized in hydrogen storage in different media to solve the storing problem because the main barrier for the common usage of hydrogen is suitable and convenient uptake in materials. Hence, to uptake hydrogen more efficiently, physical adsorption, in other words, physisorption, is being used. As is understood from the term, hydrogen is being stored in media by weak van der Waals interactions by physisorption.1 One of the most known media that uptakes hydrogen physically is metal organic framework (MOF) structured materials that work in extremely low temperatures. MOFs are being used for many advanced applications in science, for instance, catalyst, sensors, gas separation, heavy metal removal, gas storage even CO2, methane, and others.2–8 Pioneer in MOF research, Rosi et al.9 have published the most famous MOF structured compounds MOF-5, which has the Zn 4O(BDC) 3 (BDC 5 1,4-benzenedicarboxylate) a)
Address all correspondence to this author. e-mail: [email protected], [email protected] DOI: 10.1557/jmr.2013.357 J. Mater. Res., Vol. 29, No. 2, Jan 28, 2014
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composition with a cubic three-dimensional structure uptaking 4.5 wt% hydrogen in 78 K and 20 bars pressure. To store more hydrogen efficiently, novel MOF structured materials are being investigated worldwide by researchers experimentally or theoretically. [Cu2(PDEB)H2O)2]xS [PDEB 5 5,59-(1,4-phenylenedi2,1-ethynediyl)bis(1,3-benzenecarbozylic acid)] formulated MOF-505 was synthesized by Zheng et al.,10 which was constructed by the special ligand PDEB. It is reported that MOF-505 uptakes 6.27 wt% hydrogen at 77 K and 20
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