Facile synthesis of hydroxy-modified MOF-5 for improving the adsorption capacity of hydrogen by lithium doping

Masaru Kubo, Hayato Hagi, Atsushi Shimojima, Tatsuya Okubo

    Research output: Contribution to journalArticle

    6 Citations (Scopus)

    Abstract

    A facile synthesis of partially hydroxy-modified MOF-5 and its improved H2-adsorption capacity by lithium doping are reported. The reaction of Zn(NO3)2×6 H2O with a mixture of terephthalic acid (H2BDC) and 2-hydroxyterephthalic acid (H 2BDC-OH) in DMF gave hydroxy-modified MOF-5 (MOF-5-OH-x), in which the molar fraction (x) of BDC-OH2- was up to 0.54 of the whole ligand. The MOF-5-OH-x frameworks had high BET surface areas (about 3300 m 2 g-1), which were comparable to that of MOF-5. We suggest that the MOF-5-OH-x frameworks are formed by the secondary growth of BDC 2--rich MOF-5 seed crystals, which are nucleated during the early stage of the reaction. Subsequent Li doping into MOF-5-OH-x results in increased H2 uptake at 77 K and 0.1 MPa from 1.23 to 1.39 wt. % and an increased isosteric heat of H2 adsorption from 5.1-4.2 kJ mol -1 to 5.5-4.4 kJ mol-1. Would I Li to you: Li doping into hydroxy-modified MOF-5 (MOF-5-OH-x) results in increased H2 uptake at 77 K and 0.1 MPa (from 1.23 to 1.39 wt. %) and an increased isosteric heat of H2 adsorption (from 5.1-4.2 to 5.5-4.4 kJ mol-1).

    Original languageEnglish
    Pages (from-to)2801-2806
    Number of pages6
    JournalChemistry - An Asian Journal
    Volume8
    Issue number11
    DOIs
    Publication statusPublished - 2013 Nov

    Fingerprint

    Lithium
    Adsorption
    Hydrogen
    Doping (additives)
    Hot Temperature
    hydroxide ion
    Ligands
    Crystals
    Growth

    Keywords

    • adsorption
    • doping
    • hydrogen
    • lithium
    • metal-organic frameworks

    ASJC Scopus subject areas

    • Chemistry(all)

    Cite this

    Facile synthesis of hydroxy-modified MOF-5 for improving the adsorption capacity of hydrogen by lithium doping. / Kubo, Masaru; Hagi, Hayato; Shimojima, Atsushi; Okubo, Tatsuya.

    In: Chemistry - An Asian Journal, Vol. 8, No. 11, 11.2013, p. 2801-2806.

    Research output: Contribution to journalArticle

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    abstract = "A facile synthesis of partially hydroxy-modified MOF-5 and its improved H2-adsorption capacity by lithium doping are reported. The reaction of Zn(NO3)2×6 H2O with a mixture of terephthalic acid (H2BDC) and 2-hydroxyterephthalic acid (H 2BDC-OH) in DMF gave hydroxy-modified MOF-5 (MOF-5-OH-x), in which the molar fraction (x) of BDC-OH2- was up to 0.54 of the whole ligand. The MOF-5-OH-x frameworks had high BET surface areas (about 3300 m 2 g-1), which were comparable to that of MOF-5. We suggest that the MOF-5-OH-x frameworks are formed by the secondary growth of BDC 2--rich MOF-5 seed crystals, which are nucleated during the early stage of the reaction. Subsequent Li doping into MOF-5-OH-x results in increased H2 uptake at 77 K and 0.1 MPa from 1.23 to 1.39 wt. {\%} and an increased isosteric heat of H2 adsorption from 5.1-4.2 kJ mol -1 to 5.5-4.4 kJ mol-1. Would I Li to you: Li doping into hydroxy-modified MOF-5 (MOF-5-OH-x) results in increased H2 uptake at 77 K and 0.1 MPa (from 1.23 to 1.39 wt. {\%}) and an increased isosteric heat of H2 adsorption (from 5.1-4.2 to 5.5-4.4 kJ mol-1).",
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    AU - Hagi, Hayato

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    N2 - A facile synthesis of partially hydroxy-modified MOF-5 and its improved H2-adsorption capacity by lithium doping are reported. The reaction of Zn(NO3)2×6 H2O with a mixture of terephthalic acid (H2BDC) and 2-hydroxyterephthalic acid (H 2BDC-OH) in DMF gave hydroxy-modified MOF-5 (MOF-5-OH-x), in which the molar fraction (x) of BDC-OH2- was up to 0.54 of the whole ligand. The MOF-5-OH-x frameworks had high BET surface areas (about 3300 m 2 g-1), which were comparable to that of MOF-5. We suggest that the MOF-5-OH-x frameworks are formed by the secondary growth of BDC 2--rich MOF-5 seed crystals, which are nucleated during the early stage of the reaction. Subsequent Li doping into MOF-5-OH-x results in increased H2 uptake at 77 K and 0.1 MPa from 1.23 to 1.39 wt. % and an increased isosteric heat of H2 adsorption from 5.1-4.2 kJ mol -1 to 5.5-4.4 kJ mol-1. Would I Li to you: Li doping into hydroxy-modified MOF-5 (MOF-5-OH-x) results in increased H2 uptake at 77 K and 0.1 MPa (from 1.23 to 1.39 wt. %) and an increased isosteric heat of H2 adsorption (from 5.1-4.2 to 5.5-4.4 kJ mol-1).

    AB - A facile synthesis of partially hydroxy-modified MOF-5 and its improved H2-adsorption capacity by lithium doping are reported. The reaction of Zn(NO3)2×6 H2O with a mixture of terephthalic acid (H2BDC) and 2-hydroxyterephthalic acid (H 2BDC-OH) in DMF gave hydroxy-modified MOF-5 (MOF-5-OH-x), in which the molar fraction (x) of BDC-OH2- was up to 0.54 of the whole ligand. The MOF-5-OH-x frameworks had high BET surface areas (about 3300 m 2 g-1), which were comparable to that of MOF-5. We suggest that the MOF-5-OH-x frameworks are formed by the secondary growth of BDC 2--rich MOF-5 seed crystals, which are nucleated during the early stage of the reaction. Subsequent Li doping into MOF-5-OH-x results in increased H2 uptake at 77 K and 0.1 MPa from 1.23 to 1.39 wt. % and an increased isosteric heat of H2 adsorption from 5.1-4.2 kJ mol -1 to 5.5-4.4 kJ mol-1. Would I Li to you: Li doping into hydroxy-modified MOF-5 (MOF-5-OH-x) results in increased H2 uptake at 77 K and 0.1 MPa (from 1.23 to 1.39 wt. %) and an increased isosteric heat of H2 adsorption (from 5.1-4.2 to 5.5-4.4 kJ mol-1).

    KW - adsorption

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    KW - hydrogen

    KW - lithium

    KW - metal-organic frameworks

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