The present paper contains theoretical analysis and a thorough discussion of the applicability of Fick’s approach to modelling
CO2 and CH4 diffusion in heterogeneous coal, especially with regard to the estimation of a single diffusion coefficient from the dependence
defined by a number series. The computations were performed for high rank coal depending on the grain size of coal samples
and within a narrow range of temperature − 293 and 303 K.
The results of the model’s application to the experimental data show that the method of estimation of the diffusion coefficient
is very important. Our results also show that the diffusion coefficient changes are closely related with the one-parameter
analysis of coal grain size distribution.
It was shown that for the investigated grain size distribution the diffusion coefficient as expressed by Fick’s law may only
be determined as a value which is directly proportional to the diffusion parameter. Hence, the estimation of D/r2 is recommended.
In this short communication, a recent article published in the Journal of Thermal Analysis and Calorimetry, which presents
an erroneous conclusion based on incorrect calculations, is critically discussed. Since the observations made in that report
are based on part of the content of a publication of my authorship, trying to reject some expressions I presented, obviously
it came to my attention. This brief note emphasizes that some of the arguments used and the main conclusion stressed in the
manuscript under discussion are wrong and must be dismissed.
Authors:A. Ballistreri, G. Montaudo, and C. Puglisi
The LPTD-MS method, used to determine kinetic parameters in the thermal degradation of polymers by means of volatilization
curves, was applied to TG data and the results were compared with those obtained by the methods of Flynn & Wall, Friedman,
Freeman & Carroll, and Coast & Redfern.
A cracking catalyst designatedSRNY was manufactured from a commercialSRNY molecular sieve (M.S.). The support consisted of kaolin, clay and SiO2. The coking behaviour of theSRNY M.S., the support and the catalyst were examined with light diesel oil (LDO) as feedstock in a microreactor. The physico-chemical properties of both fresh and aged samples, subjected to or not subjected
to the cracking reaction ofLDO, were sequentially characterized by means of pore structure determination and thermal analysis. The pore structure included
the specific surface area and the pore volume or porosity. Thermal analysis methods used included TG and DSC.
The results indicated that all coked samples exhibited obvious changes in surface pore structure and acidity in comparison
with non-coked samples. Their specific surface area and acid amount decreased with increase in the coke content of the samples.
The apparent activation energy data obtained from decoking samples in an air flow, using the temperature-programmed oxidation
(TPO) method, showed that the kinetic parameters of theSRNY M.S. differed from those of theSRNY catalyst and its support.
The TG(DTG) and DTA of poly(p-xylylene) and poly(α,α,α′,α′-tetrafluoro-p-xylylene) are reported. The degradation was performed from ambient temperature to 900°C in both air and nitrogen. Both polymer
degrade faster in air than under nitrogen but the fluorinated polymer eventually decomposed at higher temperature in air than
in nitrogen atmosphere. The activation energies of the degradation processes is given.
assumptions. Moreover, we will provide some piece of advice to manipulate experimental data to apply isoconversional methods properly.
Non-constancy of the activationenergy
Originally isoconversional methods were based on the