β Scribed by Yoshinari Inukai; Moetaz I. Attalla; Louis S.K. Pang; Michael A. Wilson
No coin nor oath required. For personal study only.
A crude mixture of C,, and C,,, fullerenes was chromatographed on coals of rank varying from brown coal to 'pseudo' semianthracite to determine their capability as a separation medium for purifying C&, fullerene. Considerable variation in separation performance was found between the coals. Treatment of all these coals with tetrahydrofuran improved their subsequent performance, probably owing to swelling of the coal, resulting in a more favourable pore structure. No correlation was observed between separation performance and carbon aromaticity as measured by n.m.r. Coals which are expected to have a high porosity in the transitional (mesopore) range (2-50 nm) appear to perform best, probably because this pore size is appropriate for fullerene separation.
π SIMILAR VOLUMES
Coal-derived liquids, obtained from pilot plants and bench-scale reactors, have been separated by gel permeation chromatography into aromatic, phenolic, and asphaltenic fractions, where asphaltenes and long-chain hydrocarbons are in the same fraction. The chromatographic system uses 10 nm PStyragel