添加三聚氰胺制备含氮沥青基球形活性炭的研究

沥青加萘调制过程中引入与沥青等质量的富氮化合物三聚氰胺,然后经球化、氧化、炭化和H_2O活化制备得到具有一定含氮官能团的沥青基球形活性炭,利用热重、N_2吸附仪和X-射线光电子能谱等手段研究了氧化沥青球的炭化、活化行为,考察了活化样品的孔隙结构、元素组成和表面化学性质。结果表明,三聚氰胺的引入丰富了沥青基球形活性炭的表面化学性质,使其同时具备明显的含氧和含氮官能团,其中含氮官能团主要以吡啶、吡咯和氮氧化合物形式存在;此外,三聚氰胺的引入提高了炭化沥青球在活化过程中与H_2O的反应速率,从而得到孔隙结构更为发达的沥青基球形活性炭。

STUDY ON MELAMINE AS ADDITIVE ON THE PREPARATION OF N-CONTAINING PITCH-BASED SPHERICAL ACTIVATED CARBON

N-containing pitch-based spherical activated carbon (PSAC) was prepared from the mixture of coal-tar pitch and melamine (the mass ratio is 1:1).The carbonization behaviors of oxidized pitch spheres,pore structure,C/H/N composition and surface functional groups of PSAC were investigated by thermogravimetry analysis (TGA),N_2 adsorption equipment,elemental analysis and X-ray photoelectron spectroscopy (XPS).The results show that the introduction of melamine enriches the surface chemistry of PSAC,and favors the formation of N-containing functional groups in the form of pyridine,pyrrole or pyridine,nitrogen oxide and nitrate structure.Moreover,melamine as additive accelerates the porous development of PSAC during H_2O activation process.