Furthermore, as the vertical activation energy
of the equilibrated samples is not reduced irreversibly by processing, it is stated that the degree of branching is not affected by mechanical degradation.
And hot deformation apparent activation energy
of the AZ81E alloy is 166.15 kJ/mol, approximately.
The activation energy
and ash content of raw coal were determined as 41.24 kJ/mol and 35.84%, respectively.
The Arrhenius equation was used in a modified form to illustrate the relationship between the effective moisture diffusion and the ratio of the microwave output power to sample weight (m/P) instead of the temperature for calculation of the activation energy
. The modified Arrhenius equation (6) derived by Dadali et al.
After fitting is conducted over the fixed viscosity and temperature reciprocal, the activation energy
of the viscous flow of a slag component was obtained according to the slope.
Reaction temperature-dependent rate constants were obtained in the experiments, and the activation energy
and pre-exponential factor were determined using equation (7).
The f([alpha]) function can be determined from a nonisothermal curve if activation energy
is known (Malek 1989).
Where Ea, R, Ko and T are activation energy
for the hydration process in kJ.mol-1, universal gas constant in 8.314x10-3 kJ mol-1 K-1, frequency factor or pre-exponential constant in % s-1, the soaking temperatures (K), respectively.
A new distributed activation energy
model using Weibull distribution for the representation of complex kinetics.
The activation energy
values we got for FeAc and FeAc-FD are smaller than those ones found in scientific literature for some transition metal acetates .
Several models [11-14] employed single activation energy
value to estimate kinetic parameters, assuming a first order of reaction, whilst other methods [5, 7, 15] made use of the distribution of activation energy
values over the entire range of pyrolysis process.
where d[alpha]/dt is the reaction speed, [s.sup.-1]; k is the speed constant; E is the activation energy
, J/mol; R is the universal gas constant, J/(mol x K); T is the temperature, K; [alpha] is the degree of transformation, %.