Abstract: Internal structure changes of Polyethersulfoneketone film during pyrolysis in argon from room temperature to 950℃ were studied by Fourier transform infrared spectroscopy (FTIR). From the variations of the spectral bands, it is suggested that the scission of the phthalazine ring along N-N bond occurs during pyrolysis, leading to the formation of compounds of phenyl with the conjugated nitrile group and the isocyan group. As the isocyan group is polymerized further, diphenyl carbondiimine may be formed, further polymerization of which forms a nitrogen-containing polycyclic aromatic compound. Further continuous carbonization should lead not only to a combining of the heteroaromatic ring, but also to the evolution of small gaseous molecules like hydrogen cyanide and the formation of a giant nitrogen-containing polycyclic compound, which can be further polycondensed to form a solid product with a giant polyaromatic planar ring.

Abstract: Taixi anthracite was activated by steam in the presence of two kinds of additives, nitrate and potassium-containing compounds. The starting coal was ground to pass a 200 mesh sieve and mixed with additives and binder. The mixture was then kneaded, extruded, carbonized and activated. An orthogonal design was employed to analyze the effect of the ratio of the two additives, heating rate in carbonization, activation temperature and activation time on the microspore volumes of the resulting activated carbons. The optimum condition was found at the ratio of two additives, nitrate and potassium-containing compound, being 2 : 1, heating rate 5℃/min, activation temperature 920℃ and soak time of 3.5 h. The resulting activated carbons were tested using an Autosorb-1-MP with nitrogen at 77K. Their BET surface areas, total pore volumes, micropore volumes, micropore surface areas and pore size distributions were analyzed by the BET method, D-R equation and Density Function Theory (DFT). Pore size distributions of the activated carbons produced with 6 w/% additives and without additives under the optimum conditions were analyzed by DFT. It is concluded that the use of 6 w/% additives can effectively increase micropore volumes and total pore volumes, with the former increased from 0.184 7 mL/g to 0.329 9 mL/g and the latter increased from 0.218 6 mL/g to 0.512 8 mL/g.