A comprehensive kinetics study of coconut shell waste pyrolysis. (July 2017)

• Record Type: Journal Article
• Authors: Ali, Imtiaz; Bahaitham, Haitham; Naebulharam, Raed
• Is Part Of: Bioresource technology. Volume 235(2017)
• Page Start: 1
• Page End: 11
• Publication Date: 2017-07
• Subjects: Coconut shell waste -- Pyrolysis -- Iso-conversional methods -- Pseudo-components -- Independent parallel reactions; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2017.03.089
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Integral model-fitting methods are more accurate for one-step reaction mechanism. f ( α ) = ( 1 - α ) 4 · [ - ln ( 1 - α ) ] 0.53 is the reaction model of CSW pyrolysis. Four independent-parallel-reaction model fits well with Gaussian distributions. E a of pseudo-components can be reliably estimated from model-free methods. 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 21.9 kJ.mol −1, 106.4 kJ.mol −1 and 108.6 kJ.mol −1 for 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 79.1–226.5 kJ.mol −1 .