title: Combustion reaction kinetics of guarana seed residue applying isoconversional methods and consecutive reaction scheme.
abstract: This work aims the study of decomposition kinetics of guarana seed residue using thermogravimetric analyzer under synthetic air atmosphere applying heating rates of 5, 10, and 15°C/min, from room temperature to 900°C. Three thermal decomposition stages were identified: dehydration (25.1-160°C), oxidative pyrolysis (240-370°C), and combustion (350-650°C). The activation energies, reaction model, and pre-exponential factor were determined through four isoconversional methods, master plots, and linearization of the conversion rate equation, respectively. A scheme of two-consecutive reactions was applied validating the kinetic parameters of first-order reaction and two-dimensional diffusion models for the oxidative pyrolysis stage (149.57kJ/mol, 6.97×10(10)1/s) and for combustion stage (77.98kJ/mol, 98.611/s), respectively. The comparison between theoretical and experimental conversion and conversion rate showed good agreement with average deviation lower than 2%, indicating that these results could be used for modeling of guarana seed residue.
authors: School of Chemical Engineering, University of Campinas, 500 Albert Einstein Avenue, Campinas, SP 13083-852, Brazil.
authors: Fernanda Cristina Rezende
authors: FCR
authors: Lopes
authors: School of Chemical Engineering, University of Campinas, 500 Albert Einstein Avenue, Campinas, SP 13083-852, Brazil. Electronic address: katia@feq.unicamp.br.
authors: Katia
authors: K
authors: Tannous
authors: School of Chemical Engineering, University of Campinas, 500 Albert Einstein Avenue, Campinas, SP 13083-852, Brazil.
authors: Yesid Javier
authors: YJ
authors: Rueda-Ordóñez
mesh_terms: D006358:Hot Temperature; D007700:Kinetics; D032126:Paullinia / Q000737:chemistry*; D010936:Plant Extracts / Q000737:chemistry*; D012639:Seeds / Q000737:chemistry*; D013818:Thermogravimetry
chemical_list: D010936:Plant Extracts
keywords: Activation energy; Biomass; Combustion; Kinetics; Thermogravimetry