Kinetic Analysis of Tropical Lignocellulosic Agrowaste Pyrolysis

Abstract

The thermal behavior of three Colombian agricultural residues was studied by non-isothermal thermogravimetric analysis (TGA) at various heating rates. An approach using a combined kinetics parallel reaction model and model-free isoconversional methods proved to be suitable to determine the pyrolysis kinetic parameters of biomasses with different macromolecular composition and H/C and O/C ratios near 1.5 and 0.8, respectively. Fraser-Suzuki functions representing the derivative TGA (DTG) of hemicellulose, cellulose and lignin showed a very good agreement with the experimental data. The calculated apparent activation energy of biomass pseudocomponents evidenced no dependence on the reaction extent in all the conversion range, validating the use of master plots for decomposition mechanism identification. Pseudo-hemicellulose, pseudo-cellulose, and pseudo-lignin showed to be close to a second-order kinetic model, a random scission, or an Avrami-Erofeev model and a high-order kinetic model, respectively. Comparing the three feedstocks, the apparent activation energy of the pseudo-components was in the order: bamboo guadua E a < coconut shells E a < oil palm shells E a. The results show that even when sample elemental composition is very similar, macromolecular constituents, in particular lignin, could have an impact in the biomass decomposition rate and apparent activation energy. For the three studied materials, the model fitting error below 10% showed that the calculated kinetic parameters are suitable for the description and prediction of the biomass thermal decomposition.

Thermal Analysis of Nigerian Oil Palm Biomass with Sachet-Water Plastic Wastes for Sustainable Production of Biofuel

“…The peak temperature (T p ) of each reaction, as revealed in Figures 1 and 2, is to be expected within a small range around the local maximum of mass loss rate. Listed in Table 3 are the calculated values for the kinetic parameters, including activation energy, E a , pre-exponential factor, A, and reaction rate constant at peak temperature, of all the samples at the applied heating rates of 10 and 20 • C. In all cases, the value of R 2 , (correlation coefficient) of the fitting straight line was above 0.90; this indicates that the corresponding non-isothermal model-fitting is in good agreement with the pyrolysis analysis and kinetics [46]. Furthermore, a comparison of the selected heating rates on pyrolysis of blends on solid-state kinetics data is presented.…”

Catalytic Effect of Inorganic Elements on Steam Gasification Biochar Properties from Agrowastes

“…The chars obtained from the steam gasification of oil palm shells (OPS), coconut shells (CS), and bamboo guadua (BG) were characterized and analyzed in this study. The chemical organic and inorganic composition of the raw materials were determined according to the standards of solid biofuels, detailed in a previous work, 18,22 and are summarized in Table 1. 2.2. Gasification Experimental Setup.…”

Steam gasification behavior of tropical agrowaste: A new modeling approach based on the inorganic composition

“…The samples were collected in Colombia, South America, and were provided by a palm oil extraction plant, a food processing industry, and a furniture and handicraft construction site, respectively. The origin of selected samples has been detailed on a previous work [18]. The chemical composition of the biomasses was determined according to the standards of solid biofuels with at least three replicates, and is presented in Tables 1 and 2. Elemental composition (C, H, N, S, and O) was determined using a [19][20][21].…”