A kinetic approach to the temperature-programmed pyrolysis of Turkish oil shales in a fixed bed reactor:: Determination of kinetic parameters for n-paraffins and 1-olefins evolution

The thermal degradation of both Goynuk oil shales (GOS) and Beypazari oil shales (BOS) has been investigated under nonisothermal conditions. The recovery of organic carbon as 1-olefins and n-paraffins was determined by temperature-programmed pyrolysis of oil shales. A fixed bed reactor under argon flow was used to pyrolyze small samples of oil shales. A special gas-phase sampling technique was used to determine the composition of products eluted from the reactor as a function of temperature and time. Hydrocarbon evolution data have been analyzed by Coats-Redfern and Chen-Nuttall combinations. It must be emphasized that the evaluation of temperature-programmed pyrolysis data by combined use of Coats-Redfern and Chen-Nuttall methods provide satisfactory mathematical approaches to obtain kinetic parameters for 1-olefins and n-paraffins formation from thermal degradation of Turkish oil shales. Using this method, it is possible to identify every stage of pyrolysis and derive values for kinetic parameters.