DEVELOPMENT OF NONUNIFORM MICROPORE STRUCTURE OF CARBON ADSORBENTS DURING ACTIVATION - ADSORPTION AND SMALL-ANGLE X-RAY-SCATTERING STUDIES

The development of the micropore structure of activated carbons during activation was studied by small-angle X-ray scattering and adsorption methods. A new method for the processing of experimental data was use d; this method makes it possible to obtain curves of the dimension dis tribution of micropores from the intensities of small-angle X-ray scat tering and the adsorption isotherm. In the initial stage of activation , up to burnouts omega less than or equal to 0.3, the micropore struct ure is uniform, micropores with radius of gyration under 0.5-0.6 nm do minate. When activation is more prolonged (omega = 0.3 divided by 0.67 ), a bimodal system with R(1)(max) approximate to 0.6 nm and R(2)(max) approximate to 0.85 divided by 1.0 nm forms, and the volume of large micropores (supermicropores) exceeds that of small ones considerably.