Identifikasi Efek Heating Rate terhadap Laju Kinetika Reaksi Pirolisis Kayu Mahoni dengan Thermal Analysis dan Termogravimetry

Abstract

The study was conducted to investigate the biomass pyrolysis using mahogany wood as the feedstock. Chemically, mahogany wood contained complex biomass compounds, consisting of cellulose, hemicellulose, and lignin. Each biomass compound had its degradation at a certain temperature. Therefore, their compounds will be pyrolyzed at some different temperatures to understand the certain one. In the experiment, the biomass was hydrolyzed based on the temperature differences from room temperature to a temperature around 1000ºC (1273 K). We identified pyrolysis kinetic rate and measured some appropriate pyrolysis temperatures to accomplish the pyrolysis process. Afterward, the investigation of its thermal degradation used Thermal Analysis and Thermogravimetric (TGA) analysis. It would be obtained the estimation of energy needed to obtain a mathematical equation determined by the dependencies of the pyrolysis temperature by using LINSEIS STA Platinum Series. The mathematical equation was gained by using the temperature difference profiles (differential thermal analysis-DTA) and the biomass weight loss (difference thermogravimetry-DTG) by means of TGA. It was measured under the inert condition without Oxygen at the heating rate of 400°C/h and 800°C/h. By using order-1 differential equations, the activation energy, and pre-exponential factors also were determined in the mathematical equation of the kinetic reaction rate equation as k₁ = 7.9033  for a heating rate of 400°C/h and k₂ = 9.7745  for heating rate 800°C/h.