Mercury porosimetry of coalsPore volume distribution and compressibility

Multifractal analysis of Hg pore size distributions of tectonically deformed coals

“…(1) comprises some unfilled pores (Friesen and Mikula, 1988;Li et al, 1999). For a compressible solid (Li et al, 1999):…”

“…However, the mercury intrusion data correction has not been carried out in the evaluation of PSDs related to TDCs, which would lead to an erroneous result for pore volume evaluation without compressibility correction. Furthermore, the compressibility of coal used to adjust the Hg pore volume is difficult to determine using the MIP method alone (Friesen and Mikula, 1988). N 2 adsorption is useful for characterizing porosity in the pore size range of 2-300 nm (Gan et al, 1972;Unsworth et al, 1989), and CO 2 adsorption works well for characterizing micro-porosity (b2 nm) (Liu and Wilcox, 2013;Mastalerz et al, 2008).…”

“…Among these, MIP is frequently used to estimate PSDs and has been used to characterize pore size of TDCs (Qu et al, 2010). The MIP method is useful for characterizing porosity distribution with pore size above 3 nm (Gan et al, 1972;Ritter and Drake, 1945), but the high pressure (P N 10 MPa) may damage narrow pores or compress the coal matrix, and the reduction in bulk volume of the sample could occur (Friesen and Mikula, 1988). With the applied pressure increasing, the simultaneous compression and pore-filling occur during mercury intrusion (Li et al, 1999).…”

Comparing the porosity and surface areas of coal as measured by gas adsorption, mercury intrusion and SAXS techniques

“…MIP is another standard method of determining the porosity and surface areas of coals, but is limited only to meso-and macro-porosity [27][28][29][30][31][32][33][34][35][36][37][38]. Although the application of the macroporosity of coals to most of its utilisation processes is still very limited, the understanding of this property is relevant in predicting total gas capacities of coals when used for CO 2 sequestration [39].…”

Textural properties in density-separated coal fractions

“…Several authors [12][13][14][15] have concluded that mercury penetration in coal at pressures above 10 MPa is actually due to coal compressibility, which they calculate as a constant value. Others have argued that both pore intrusion and compression of coal occur above 10 MPa 16,17 . In this paper a modified method based on that developed by Zwietering and van Krevelen 12 and Toda and Toyoda 13 was applied.…”