INVESTIGATION ON THE PYROLYSISKINETICS AND MECHANISM OF DATE STONE USING THERMOGRAVIMETRIC ANALYSIS
Journal Title: Engineering and Technology Journal - Year 2018, Vol 3, Issue 1
Abstract
The aim of this work was to investigate the physiochemical properties and thermal behavior of date stone in order to find an appropriate of these materials for energy production. The physiochemical properties such as proximate analysis, ultimate analysis, heating values and FTIR spectroscopy of date stone were investigated. The pyrolytic characteristics and kinetics was investigated by thermogravimetric analysis. The experiments were performed in 105-900 °C temperature range under nitrogen atmosphereat heating rates of 5, 10, 20 and 50 °C/min. Pyrolysis characteristics was accomplished at four stages which can mainly be attributed to decomposition of extractives, decomposition of hemicellulose, decomposition of cellulose, and decomposition of lignin, respectively. Pyrolysis characteristics and the thermal decomposition rate were significantly affected by variation in the heating rate. However, the temperature peaks at maximum weight loss rate changed within creasing heating rate. The activation energy was obtained by model free methods proposed by Friedman (FR), Flynn-Wall-Ozawa (FWO) and Vyazovkin (VYA), and the kinetic mechanism was deduced by master plots method. The masterplots method suggested that diffusion model was the most probable reaction mechanism to describe the pyrolysis of hemicellulose and the reaction model function was . The kinetic process for the decomposition process of cellulose can be described by reaction order model . The results suggested that the experimental results and kinetic parameters provided useful information for the design of pyrolytic processing system using date stone as useful source of energy, chemicals and activated carbons.
Authors and Affiliations
H. Hammani, W. Boumya, M. Achak, O. Abdelaoui, M. El Achaby, A. Barakat, K. El harfi, M. A. El Mhammedi, A. Aboulkas
Keywords
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