Thermogravimetric analysis of lignocellulosic and microalgae biomasses and their blends during combustion

Differences between combustion and oxy-combustion of corn and corn–rape blend using thermogravimetric analysis

“…This behaviour was previously described by the other authors in the literature [48,58] in terms of lignin content. The obtained activation energies are in accordance with the results previously reported for several bioresidues [5,17,24,[30][31][32][33]41,48,50,54,59,60], considering that the oxy-combustion processes generally disfavour chemical reactions. The pre-exponential factors and orders of reaction are in accordance with the previous results [5,[30][31][32][33]54,59,60].…”

“…The behaviour of corn and rape at different temperature ramps is very similar as it was discussed in previous works [32]. That is the reason why only corn comparative is explained.…”

“…However, the sample requires some amount of time to reach the experimental temperature in this type of experiment [14,24], which is a drawback that non-isothermal methods do not account for. Model-fitting mathematical approaches were the original and most popular, especially for isothermal experiments, but they have lost popularity to isoconversional methods, which can compute kinetic parameters without modelling assumptions [30][31][32][33]. Model-free isoconversional methods allow E to be estimated as a function of α without pre-fixing the reaction model.…”

Thermogravimetric analysis of the behavior of sub-bituminous coal and cellulosic ethanol residue during co-combustion

“…Table 2 shows the combustion properties under different heating rates. As the heating rate increased, the DTG curves were translated to higher temperatures, according to the results reported in the Literature (López et al, 2013). In particular both stages of the combustion process are developed in a wider temperature range, when increasing the heating rate.…”

“…CER combustion activation energy is lower if compared to data previously reported for other biomasses (López et al, 2013;Wang et al, 2012); this is mainly due to its high content of lignin, which has an activation energy value (18-65 kJ/mol) lower than cellulose (195-286 kJ/mol) and hemicellulose (80-116 kJ/mol) (Gronli et al, 2002). Activation energy (E) average value, as a function of the blending ratio of CER is shown in Fig.…”