Table 2.
Summary of structural parameters derived from nitrogen at 196 °C and carbon dioxide at 0 °C isotherms.
| N2 (pore width < 200 nm) | CO2 (pore width 0.3–1.5 nm) | |||
|---|---|---|---|---|
| SA, m2/g | V, cm3/g | SA, m2/g | V, cm3/g | |
| Shales | ||||
| Barnett | 3.7 | 0.010 | 4.7 | 0.002 |
| Utica | 1.3 | 0.005 | 1.7 | 0.001 |
| Marcellus | 41.0 | 0.034 | 33.4 | 0.010 |
| Carbons | ||||
| Activated carbon | 963 | 0.447 | 598.8 | 0.185 |
| Graphite | 14.4 | 0.042 | 8.2 | 0.003 |
| Mesoporous carbon | 223.3 | 0.457 | 74.5 | 0.028 |
| M280 | 40.9 | 0.129 | 9.8 | 0.003 |
| Inorganics | ||||
| Illite | 24.3 | 0.037 | 20.7 | 0.007 |
| Kaolinite | 7.8 | 0.033 | 5.4 | 0.002 |
| Calcite | 8.8 | 0.036 | 14.0 | 0.003 |
| Kerogen-enriched (KE) shalesa | ||||
| KE-Barnett (19%) | 12.6 | 0.065 | 40.2 | 0.014 |
| KE-Utica (2.5%) | 13.8 | 0.047 | 11.2 | 0.004 |
| KE-Marcellus (41%) | 65.7 | 0.123 | 132.1 | 0.040 |
aIn parenthesis, weight percent of fixed carbon measured as a mass loss at 920 °C in air flow during thermogravimetric analysis (see “Methods”).