Caracterização do carvão vegetal através do uso de espectroscopia no infravermelho próximo

• Autor(a) principal: Barcellos, Daniel Camara
• Data de Publicação: 2007
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/593
• topic: Carvao vegetal; Espectroscopia; Propriedades; Charcoal; Spectroscopy; Properties; CNPQ::CIENCIAS AGRARIAS::RECURSOS FLORESTAIS E ENGENHARIA FLORESTAL::TECNOLOGIA E UTILIZACAO DE PRODUTOS FLORESTAIS

The present work intended to evaluate the use of near infrared spectroscopy in the description of properties of charcoal produced from the wood of seven native Brazilian species and five species of the genus Eucalyptus. The charcoal was obtained using conventional laboratory methods in three combinations of time and final temperature and its properties were correlated with its spectra. The band between 1500-2000 nm was found promising and was, later, subdivided into three lesser bands: 1500-1600, 1700-1800 and 1900-2000 nm. All those bands are correlated with the following properties of the charcoal analyzed: fixed carbon, volatile substances and heat value. The band from 1900 to 2000 nm presented the largest correlation coefficients with the properties of the charcoal, in all situations. In that band, the coefficients of correlation reached 0.83; 0.84; and 0.71, respectively, in the determination of fixed carbon, volatile substances and heat value for the twelve species studied. When individual species were analyzed, the largest correlation coefficients were found for a clone of Eucalyptus urophylla, with 0.97; 0.96 and 0.91, respectively, for fixed carbon, volatile substances and for heat value. It was xxconcluded that is possible to predict those charcoal properties of a certain wood sample by spectroscopy, using small wavelength bands in the area of the near infra- red.