N-doped carbon aerogels; pyrolysis; kinetics; thermogravimetry

Kinetics of pyrolysis of two carbon aerogels and three N-doped analogues was studied by thermogravimetry. Effective activation energy of pyrolysis determined by isocon-versional methods is significantly higher then values determined by non-linear regres-sion. Its dependence on conversion demonstrates the complexity of pyrolytic process. The only exception is pyrolysis of carbon aerogel prepared with addition of 3-hydroxypyridine, pyrolysis of which begins with simple process with Ea about 80 kJ mol-1. Analysis of kinetic compensation effect between effective kinetic parame-ters determined by non-linear regression lead to hypothesis that the early stages of pyrolysis of studied samples are very similar for all samples while at higher tempera-ture aerogels containing aromatically bonded nitrogen differ from the others.