日本金属学会誌

J. Japan Inst. Metals, Vol. 67, No. 3 (2003),
pp. 116-121

Storage Stability of CO2 in C60-C70 Binary System

Yutaka Takahashi and Ken Yamazaki

Department of Mechanical Engineering, Faculty of Engineering, Mie University, Tsu 514-8507

Abstract:

CO2 was absorbed into C60-C70 binary solids at room temperature using a commercially available autoclave. The solids were then immersed in liquid CO2 for 24 h at a gas pressure of 5 to 6 MPa, and the degree of CO2 storage was evaluated by infrared (IR) spectroscopy and X-ray diffraction (XRD). CO2 was detected in pure C60 by IR measurement, and the stoichiometry was estimated to be C60(CO2)0.34 based on the increase in the lattice parameter. Although no trace of CO2 storage was detected for pure C70, the addition of C70 to C60 at a mole fraction of up to 0.16 did not appreciably degrade the storage capacity of CO2 from that in pure C60. The stability of CO2 trapped in solid fullerenes is explained in terms of geometrical considerations based on hard-sphere packing at octahedral sites.


(Received September 2, 2002)

Keywords:

fullerene, carbon dioxide, autoclave, interstitial, octahedral site, stability, van der Waals bonding, hard-sphere contact


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