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Microporous Magnesium and Manganese Formates for Acetylene Storage and Separation
Author(s) -
Samsonenko Denis G.,
Kim Hyunuk,
Sun Yinyong,
Kim GhyungHwa,
Lee HeungSoo,
Kim Kimoon
Publication year - 2007
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.200600390
Subject(s) - acetylene , sorption , microporous material , adsorption , chemistry , molecule , inorganic chemistry , van der waals force , metal , organic chemistry
Acetylene sorption of microporous metal formates M(HCOO) 2 (M=Mg and Mn) was investigated. Measurements of acetylene sorption at 196, 275, and 298 K showed a Type I isotherm with quick saturation at low pressures, and 50–75 cm 3 g −1 uptake at 1.0 atm. The single‐crystal X‐ray structure analysis of the acetylene‐adsorbed metal formates revealed that acetylene molecules occupy two independent positions in the zigzag channels of the frameworks with a stoichiometry of M(HCOO) 2 ⋅1/3C 2 H 2 , which is consistent with the gas sorption experiments. No specific interaction except van der Waals interactions between the adsorbed acetylene molecules and the walls of the frameworks was found. Sorption properties of other gases, including CO 2 , CH 4 , N 2 , O 2 , and H 2 , were also investigated. When the temperature was increased to 298 K, the amount of adsorbed acetylene was still above 60 cm 3 g −1 for Mg(HCOO) 2 and 50 cm 3 g −1 for Mn(HCOO) 2 , whereas the uptake of other gases decreased substantially. The microporous metal formates may thus be useful not only for the storage of acetylene but also its separation from other gases at room or slightly higher temperatures.