The microporous phase of carbonaceous substances and its fractal dimension

✍ Scribed by J. Medek; Z. Weishauptová

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 240 KB
• Volume: 79
• Category: Article
• ISSN: 0016-2361
• DOI: 10.1016/s0016-2361(00)00014-4

✦ Synopsis

The microporous phase of carbonaceous materials is characterized by means of fractal dimension D, determined on the principle of the coverage of microporous body of ideal shape with a monolayer of molecules of various sizes. A part of molecules remains lying on the external surface of the solid phase characterizing it with the dimension D 2 and another part enters into the micropores (with dimension D 3 respecting their size distribution. The combination of both dimensions gives the resulting value of fractal dimension within interval 2 , D , 3: The fractal dimension of bituminous coal, cokes and carbonization products prepared at different temperatures of heat treatment were determined. The characteristic parameters of the microporous structure necessary for D evaluation were obtained from carbon dioxide isotherm, for active carbon they were calculated from the isotherms of CO 2 and some hydrocarbons.