Change of pore properties during carbonization of coking coal

Journal Article · Tue Jan 01 00:00:00 EST 1980 · Carbon; (United States)

DOI:https://doi.org/10.1016/0008-6223(80)90017-2· OSTI ID:5254222

Miura, S ^[1]; Silveston, P L

---

1. Kuraray Engineering Co., Kurashiki, Japan

Porosimetry, sorption and density measurements are reported on two caking bituminous coals. West Virginia Jewel No. 2 medium volatile and a Pennsylvania Pittsburgh seam high volatile C, for final carbonization temperatures between 400 and 1000/sup 0/C. Samples were not confined and heating rates of 3 and 8.2%/min were employed. The medium volatile samples exhibit pronounced maxima in pore volume, pore surface area and porosity between 600 and 800/sup 0/C. These temperatures are unexpectedly greater than those at which maximum particle dilation and maximum rate of devolatilization occur. An explanation for this observation is that closed pores are created during carbonization below 600/sup 0/C which are opened when carbonization is carried to higher temperatures. Shape of the pore volume curves suggest new pore initiation, pore growth and pore shrinkage are the dominant processes operating, although collapse of the ultra micro pore structure seems to occur above 800/sup 0/C. A pore development model employing simple expressions for the three dominant processes successfully predicts the pore volume and surface area changes. Apparent activation energies derived from the model indicate that the rates of these dominant steps are controled by basicaly physical, not chemical, changes.

• OSTI ID: 5254222
• Journal Information: Carbon; (United States), Vol. 18:2
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
COAL
CARBONIZATION
ADSORPTION
CARBON DIOXIDE
ELECTRON MICROSCOPY
NITROGEN
POROSIMETERS
POROSITY
SORPTIVE PROPERTIES
SURFACE AREA
CARBON COMPOUNDS
CARBON OXIDES
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
CRYOGENIC FLUIDS
DECOMPOSITION
ELEMENTS
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUELS
MEASURING INSTRUMENTS
MICROSCOPY
NONMETALS
OXIDES
OXYGEN COMPOUNDS
SORPTION
SURFACE PROPERTIES
010401* - Coal & Coal Products- Carbonization- (-1987)
010600 - Coal
Lignite
& Peat- Properties & Composition