Preparation And Application Of Phenolic Resin-based Spherical Activated Carbon

Phenolic resin-based beads were prepared from Phenol and Formaldehyde by suspension polymerization. The effect of technological parameters on particle size and size distribution of beads was investigated deeply. Phenolic resin-based spherical activated carbon (PFSAC) were prepared from phenolic resin beads. The adsorption and desorption performance of benzene and n-heptane on PFSAC was studied. Finally, activated carbon microspheres were obtained and its electrochemistry performance in the organic solvent was studied. Contents of this thesis as follows:The technological parameters included:amount of PVA, stirring rate, phenol-formaldehyde ratio, amount of HMTA, the catalyst type and the stabilizer type. By optimizing the process conditions,50.22 wt% from 0.3 mm to 0.6 mm of the best phenolic resin-based beads were obtained, the carbonized density was 0.88 g/cm3, PFSAC with specific surface areas (up to 1718 m2/g) by BET and total pore volume (up to 0.71 cm3/g) by DFT was gained.The adsorption and desorption performance of benzene by PFSAC and commercial activated carbons was studied:the regeneration performance of the samples was good; the adsorption capacity of PFSAC was largest (up to 1.48 mmol/g), there was a relationship between the saturated adsorption capacity and specific surface area of 0.585～1.17 nm. what's more, the desorption time under combined temperature (250℃and 300℃) was shorter than that under any simple temperature, and the desorption time of PFSAC was shortest. After the study of n-heptane, we knew that the desorption time changed to be shorter with the temperature going up, and that the desorption time was determined by the mesoporous amount and specific surface areas under the same temperature.The microbeads were prepared from phenol and HMTA at 180℃by hydrothermal reaction, after carbonization and KOH activation, the activated carbon microbeads with specific surface areas (up to 1583 m2/g) and large micropore capacity were obtained. The specific capacitance of this material at 0.1 A/g was 140.98 F/g, but the retention rate of specific capacitance after 200 charge-discharge cycles was only 63%, while the sample with much mesoporous capacity was 85%.