Infrared spectroscopy analysis on charcoal generated by the pyrolysis of Corymbia. citriodora wood

Abstract

Wood pyrolysis has been use for centuries to obtain charcoal. Nonetheless, the study of wood components altering by the pyrolysis temperature is crucial to determine the charcoal’s properties. The present research aims to evaluate by FTIR the chemical altering of wood submitted to various pyrolysis temperatures. Sam-ples of Corymbia citriodora species were submitted to temperatures of 240 °C, 280 °C, 320 °C and 400 °C in a fixed bed reactor filled with N2. The FTIR analysis was performed in the wood residues after pyrolysis. The results showed that cellulose and hemicelluloses presented more susceptibility to thermal degradation than other wood components. It could be observed chemical altering in the wood residue obtained between 240 °C and 280 °C. In addition, the wood residue obtained for treatments over 280 °C presented characteristics simi-lar to vegetal charcoal. There are a continuous change of the wood due to the temperature of the pyrolysis by the change of bands intensity and by the bands shift. The FTIR analysis allowed the evaluation of the wood’s pyrolysis process and its chemical variations with the temperatures applicate.

A comparative study of wood sawdust and plastic smoke particulate matter with a focus on spectroscopic, fluorescent, oxidative, and neuroactive properties

“…In addition, bands of stretching vibrations of aliphatic CH 2 (2907 and 2843 cm −1 ) and CH 3 (2966, 2945, and 2880 cm −1 ) molecular groups have been registered in this region. In particular, the band 2869 cm −1 can be attributed to the methoxy group (O-CH 3 ) of lignin (Dias Júnior et al 2019 ). The contribution of CH 2 groups of poplar wood was slightly greater than that of birch and pine woods.…”

“…The bands in the region of 1680–1650 cm −1 and the intense band in the region of 1613 cm −1 indicated the presence of unsaturated bonds in aromatic rings, including lignin and polysaccharide degradation products. At increased temperature, this 1613 band was mainly unchanged (Dias Júnior et al 2019 ). The band in the region of 1500 cm −1 referred to the aromatic C = C valence vibrations of benzene rings of lignin that in the process of pyrolysis shifted to a higher frequency region (in this study, the band of 1516 cm −1 ).…”

Charcoal as an Alternative Reductant in Ferroalloy Production: A Review

“…Charcoal produced at 240 • C exhibited the same FT-IR bands as biomass, whereas specific bands of cellulose, hemicellulose and aromatic ring groups from lignin disappeared after a heat treatment temperature of 400 • C [250]. This change in chemical composition started at temperatures above 350 • C [251].…”

Effect of Temperature and MgCl2 Concentration on the Catalytic Pyrolysis of Malt Waste Using Response Surface Methodology

“…The bands between 1570–1700 cm −1 corresponding to the vibration of the C=C bond of aromatic rings [76] related to the lignin structure and aromatic compounds were also greatly reduced in the biochar because of the elimination of both H and O from aliphatic compounds during pyrolysis [77] . Equation (11) presents the prediction equation ( R 2 =0.918) for the ratio between the integrated areas of the aromatic C=C bond from the biochar and from the MW ( ).…”