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To understand transition characteristics from wood to charcoal, Quercus variabiliswood was carbonized at 200, 250, 300, 340, 540 and 740°C, respectively. Heating value, pH and surface property by FT-IR spectroscopy of the carbonized charcoal were investigated. Heating value and pH increased with increasing carbonization temperature from 4500 cal/g and 4.3 of the control wood to 8,000 cal/g and 9 of the char-coal carbonized at 740°C, respectively. From FT-IR spectroscopy, the peaks from O-H, C-H and C-O stretching disappeared during carbonization at 540 and 740°C. Aromatic skeletal vibration at near 1,506~1,593 cm -1 was repidly increased until 540°C. These results suggest that the chemical and physical characteristics of wood components in cell wall can be easily changed by increasing carbonization temper-ature and the carbonization seem to be incomplete at temperature below 540°C. Keywords : carbonization, charcoal, heating value, pH, FT-IR 1. INTRODUCTION Charcoal can be generally produced when wood is heated in the absence of oxygen. In this process, the water contained in the wood is first driven off before the wood constituents (cellulose, hemicellulose and lignin) begin to be thermally decomposed. Wood pyrolysis is a complex combination with the individual py-rolysis of cellulose, hemicellulose, lignin and extractives, each of which has its own charac-teristics (Kwon et al., 2009).Zeriouh and Belkbir (1995) reported that, in the pyrolysis process of wood constituents with heating rate of 5°C min

Change of Heating Value, pH and FT-IR Spectra of Charcoal at Different Carbonization Temperatures