Activation Energy Pre-exponential Factor Research Articles

Pyrolytic and kinetic characteristics of Platycodon Grandiflorum peel and its cellulose extract

The pyrolytic and kinetic characteristics of a biomass waste material, namely Platycodon grandiflorum A. DC (P. G.) peel and its cellulose extract were studied at heating rates of 10, 30 and 50°C/min under a nitrogen flow atmosphere. The most probable mechanism function and activation energy pre-exponential factors were calculated by using the Popescu, FWO and KAS methods. The three stages appeared during pyrolysis include: moisture evaporation, primary devolatilization and residual decomposition. Significant differences in the average activation energy, thermal stability, final residuals and reaction rates of the P. G. peel and its cellulose extract were observed. Stage II of the P. G. peel and its cellulose extract could be described by the function Avrami–Erofeev [−ln(1−α)]3 and the function chemical reaction (1−α)−0.5, respectively. The average activation energy of P. G. peel and its cellulose extract were 157 and 196kJ/mol, respectively. Kinetic compensation effects of the pre-exponential factors and activation energy were also observed.

Evalution of the Pyrolytic and Kinetics Characteristics of <i>Xanthoceras</i> <i>sorbifolia</i> Oil

The pyrolytic characteristics and kinetics of Xanthoceras sorbifolia oil were investigated at heating rates of 10, 20 and 30 °C min-1 in an inert atmosphere. The most probable mechanism function and activation energy pre-exponential factors were calculated by the Popescu, FWO and KAS methods. Three stages appeared during pyrolysis: moisture evaporation, primary devolatilization and residual decomposition. Significant differences in the average activation energy, thermal stability, final residuals and reaction rates of the X. sorbifolia oil at different heating rate were observed. Stage II of the X. sorbifolia oil could be described by the Mampel Power equation 22 (n=0.25). The average activation energy of X. sorbifolia oil was 346 kJ mol-1.

Pyrolytic Characteristics and Kinetics of Xanthoceras Sorbifolia Oil

The pyrolytic characteristics and kinetics of Xanthoceras sorbifolia oil were investigated pyrolysis in indifferent atmosphere and at heating rates of 10, 20 and 30 °C min-1 in an inert atmosphere. The most probable mechanism function and activation energy pre-exponential factors were calculated by the Popescu, FWO and KAS methods. Three stages appeared during pyrolysis: moisture evaporation, primary devolatilization and residual decomposition. Significant differences in the average activation energy, thermal stability, final residuals and reaction rates of the X. sorbifolia oil were observed. Stage II of the X. sorbifolia oil could be described by the Avramic- Erofeev equation 20 (n=4). The average activation energy of X. sorbifolia oil was 353 kJ mol-1

Pyrolytic characteristics and kinetic studies of three kinds of red algae

Abstract Marine algae have great potential as a third generation biofuel feedstock. The pyrolytic and kinetic characteristics of three kinds of red algae ( Pophyra yezoensis , Plocamium telfairiae Harv and Corallina pilulifera ) were studied at heating rates of 10, 30 and 50 °C min −1 under an inert atmosphere. The most probable mechanism function and activation energy pre-exponential factors were calculated by the Popescu, FWO and KAS methods. Three stages appeared during pyrolysis: moisture evaporation, primary devolatilization and residual decomposition. Significant differences in the average activation energy, thermal stability, final residuals and reaction rates of the algae samples were observed. Stage II of the samples could be described by the Avramic-Erofeev equation. The average activation energy of all samples was similar when calculated by different methods. Kinetic compensation effects of the pre-exponential factors and activation energy were also observed