title: A comprehensive kinetics study of coconut shell waste pyrolysis.
abstract: Model-free and model-fitting methods were compared for pyrolytic conversion of the coconut shell waste. The apparent activation energy, estimated from differential and integral iso-conversional methods, increased with the progression of pyrolytic conversion. The reaction model, f(α)=(1-α)4·[-ln(1-α)]0.53, indicate that order-based nucleation and growth mechanisms control the solid-state pyrolysis of the coconut shell waste. The active pyrolysis zone was consisted of overlapping multi-component degradation peaks. Average activation energy of the pseudo-components estimated from the Kissinger's method were 21.9kJ.mol-1, 106.4kJ.mol-1and 108.6kJ.mol-1for the dehydration, the degradation of pseudo-cellulose and pseudo-hemicellulose, respectively. Pseudo-lignin decomposed over a wide range of temperature with a slower conversion rate as compared to pseudo-hemicellulose and pseudo-cellulose. Average activation energy range of pseudo-lignin was estimated from the combination of model-free and model-fitting methods as 79.1-226.5kJ.mol-1.
authors.affiliation: Department of Chemical and Materials Engineering, King Abdulaziz University, Rabigh, Saudi Arabia. Electronic address: imtiaz_che@hotmail.com.
authors.forename: Imtiaz
authors.initials: I
authors.lastname: Ali
authors.affiliation: Department of Industrial Engineering, King Abdulaziz University, Rabigh, Saudi Arabia.
authors.forename: Haitham
authors.initials: H
authors.lastname: Bahaitham
authors.affiliation: Department of Industrial Engineering, King Abdulaziz University, Rabigh, Saudi Arabia.
authors.forename: Raed
authors.initials: R
authors.lastname: Naebulharam
mesh_terms: D002482:Cellulose; D003059:Cocos / Q000378:metabolism*; D007700:Kinetics; D008031:Lignin / Q000378:metabolism; D013818:Thermogravimetry
chemical_list: D002482:Cellulose; D008031:Lignin
keywords: Coconut shell waste; Independent parallel reactions; Iso-conversional methods; Pseudo-components; Pyrolysis