Hydrogen Adsorption Properties of Lantern-Type Dinuclear M(BDC)(DABCO)_<1/2>
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The hydrogen adsorption properties and uptake capacities of three-dimensional microporous materials of lantern-type dinuclear M(BDC)(DABCO)<SUB>1⁄2</SUB> (M=Co<SUP>II</SUP>, Cu<SUP>II</SUP>, and Zn<SUP>II</SUP>; BDC = 1,4-benzenedicarboxylate, DABCO = 1,4-diazabicyclo[2.2.2]octane; Co(BDC)(DABCO)<SUB>1⁄2</SUB> (<B>1</B>), Cu(BDC)(DABCO)<SUB>1⁄2</SUB> (<B>2</B>), Zn(BDC)(DABCO)<SUB>1⁄2</SUB> (<B>3</B>)) were investigated at various temperatures of 77–333 K and pressures up to 10 MPa using a PCT automatic measuring system (Sievert-type apparatus). The results indicated that uptake to 4.11, 2.70, and 3.17 wt % of hydrogen can be stored on <B>1</B>, <B>2</B>, and <B>3</B>, respectively, at 77 K. The amounts of hydrogen are adsorbed by all complexes at around room temperature (293 K) and high-pressures are much lower (<0.5 wt %). Adsorption isotherms at around room temperature show a linear uptake relationship; all of them follow the Henry's law. By measuring nitrogen gas adsorption/desorption, all complexes exhibit approximately Type-I isotherms according to the IUPAC classification and possess BET surface areas in the range of 1165 (for <B>3</B>) to 1595 m<SUP>2</SUP> g<SUP>−1</SUP> (for <B>1</B>). Further, the thermal stability of all complexes is high, in the range of about 500 K (for <B>3</B>) to 600 K (for <B>1</B>). These complexes were synthesized and characterized by X-ray powder diffraction pattern, TG/DTA, FT-IR, surface area analysis, and hydrogen adsorption measurements.
- Bull. Chem. Soc. Jpn.
Bull. Chem. Soc. Jpn. 81(7), 847-856, 2008-07-15
The Chemical Society of Japan