Porous nature of solvent-extracted coals

✍ Scribed by Robert G. Jenkins; Stanley C. Mitchell

• Publisher: Elsevier Science
• Year: 1978
• Tongue: English
• Weight: 634 KB
• Volume: 57
• Category: Article
• ISSN: 0016-2361
• DOI: 10.1016/0016-2361(78)90052-2

✦ Synopsis

An investigation has been made into the changes which take place in porosity when coals are partially dissolved in specific solvents. Pore structures were determined by: gas adsorption (N2 at 77 K and CO2 at 195 K), densities in mercury and helium, and mercury porosimetry. Six British coals (79.7-88.5% C daf) were extracted with boiling pyridine and one coal (87.0% C daf) with ethylene diamine and a potassium hydroxide/Cellosolve mixture. The development of porosity with increasing pyridine extraction leads to increased microporosity. Residues produced from coals of more than 86.5% C daf have enhanced porosity in all pore regions but those produced from lower-rank coals show diminished macro and transitional porosity. It is suggested that residues are suitable precursors for molecular sieves and activated carbons,