Compressibility indices and CH4 uptake capacities were determined for three
commercially produced carbons, using a specially designed cell, developed
for a high pressure thermal gravimetric analyzer. The cell was used during
CH4 uptake measurements on non-compacted and compacted cal bun materials, w
hile maintaining a constant sample volume. Compressibility, piece density,
and CH4 uptake capacities were measured for carbons having different partic
le sizes, after physical blending, and before and after coke deposition. Po
re size distributions and pore volumes was obtained. Compaction of the acti
vated carbons and a graphite powder increased the CH4 uptake per unit volum
e of the material beyond that expected from densification. The data suggest
ed that compaction and physical blending provides additional CH4 adsorption
sites in inter-particle voids. (C) 2000 Elsevier Science Ltd. All rights r
eserved.