Kinetic analysis of thermal degradation of Cedrela odorata, Marmaroxylon racemosum and Tectona grandis from timber industry

Abstract

Thermal analysis is a powerful tool to predict the composition and thermal stability of different materials. In this work, thermogravimetric analysis of Cedrela odorata, Marmaroxylon racemosum and Tectona grandis was carried out at four different heating rates (5 °C•min -1 , 10 °C•min -1 , 20 °C•min -1 and 40 °C•min -1 ) in a non-isothermal condition. The degradation kinetics was evaluated based on Flynn-Wall-Ozawa and Criado methods. The half-life time of wood degradation reaction was also studied. The wood thermal degradation process in an oxidizing atmosphere can be divided in dehydration, devolatilization, and combustion. The kinetic results revels apparent activation energy values of 130-240 kJ•mol -1 for Tectona grandis, 150-191 kJ•mol -1 for Marmaroxylon racemosum and 188-205 kJ•mol -1 for Cedrela odorata, when conversion values ranged from 0,1-0,5. The most probable degradation mechanism for wood species studied is a diffusion model based on a three-dimensional diffusion. Cedrela odorata presented the lowest reaction half-life time while Marmaroxylon racemosum showed the highest. On the basis of these results, it can be concluded that Flynn-Wall-Ozawa and Criado methods associated with half-life time of reaction may contribute to better understand the wood degradation before use it in polymer composites.

Impact of Chemical Composition on Eucalyptus Wood Clones for Sustainable Energy Production

“…On the other hand, dichloromethane extractives showed no relationship with wood combustibility indices. Although these extractives are resistant to high temperatures and have high carbon content [40], they are less present in hardwood and thus did not show relationships with the evaluated combustibility parameters [41].…”

Experimental Investigation of Kinetic Parameters of Bamboo and Bamboo Biochar Using Thermogravimetric Analysis Under Non-isothermal Conditions

“…Table 4 illustrate that as the activation energy increased as the degree of conversion rate (α) increased from 0.1 to 0.9, the, indicating that the complex reaction may have occurred at a higher temperature [50], thermal cracking and devolatization of wood components occur at this stage, implying a series of reaction [51]. The Eα values increased from 189 to 326 KJ/mol and from 189 to 335 KJ/mol for FWO and KAS, shown in Fig 5 (a & b).…”