MICROPOROSITY AND ADSORPTION CHARACTERISTICS AGAINST NO, SO2, AND NH3 OF PITCH-BASED ACTIVATED CARBON-FIBERS

The microporosity of newly developed pitch-based activated carbon fibers (ACF) was examined by nitrogen adsorption at 77 K and benzene adsorption at 303 K. The pitch-based ACF has uniform micropores of 0. 9 to 1 nm width and of 0. 45 to 1. 0 ml/g volume. Their adsorption activities against NO, SO//2, and NH//3 were examined at 303 K. The DR plots for nitrogen, benzene, and NO, SO//2, and NH//3 adsorption isotherms are constructed and their micropore filling is discussed. The degree of micropore filling becomes greater in the order NO, NH//3, SO//2. The degree of micropore filling and the isosteric heat of adsorption for each gas increase with the van der Waals force of these adsorbate gases.