Caracterização estrutural e composicional do carvão vegetal derivado de madeira e bagaço de cana-de-açucar / Structural and composilional characterization of charcoal derived from wood and sugar cane bagasse

AUTOR(ES)

Rone Cesar Morales

DATA DE PUBLICAÇÃO

1999

RESUMO

During the last few years, the industrial interest for the utilization of biomass and its byproducts has being increased very fast. In particular, the application of charcoal for thermo reduction of minerais (e.g. carbothermic reduction of quartz into silicon) is very attractive as an environmentally friend process in comparison with coal. In Brazil, the sugar- cane bagasse opens a new perspective for the substitution of wood for charcoal production, especially if we consider that a fraction of utilized wood comes from native forest. The present research reports the study of properties characterization of structure and chemical composition of charcoal carbonized from wood an sugar-cane bagasse by using X-ray diffraction (XRD), small angle and very-small angle X-ray scattering (SAXS and VSAXS), X-ray fluorescence spectroscopy (XRF), and scanning electron microscopy (SEM). A number ofsamples were heat-treated afier pyrolysis in the interval oftemperature of 430 and 1300 oCoThe Warren model was applied to evaluate the structural rearrangement of disordered carbons. The result shows a slight progressive structural ordering with carbonization temperature and also with heat treatment temperature (HTT). It has also been observed that such interpretation, the samples of charcoal from sugar cane is less susceptible to carbon ordering than charcoal from wood, fact that can conduct to graphitization. The analysis by SAXS e VSAXS reveals a slight decrease of inhomogeneities and micropores in the range of the radius of gyration of ~80 A and 1200A,respectively,as a function of increasing of HTT. SAXS analysis still denotes an increase of concentration of scattering centres (inhomogeneities) as a function of HTT, in the interval of SAXS (~0,2

ASSUNTO(S)

pirolise fluorescencia fluorescence bagaço de cana x-rays raios x - difração bagasse biomassa raios x - espalhamento a baixo angulo biomass pyrolysis x-ray small-angle scattering

Documentos Relacionados

• Pre-treatment and enzymatic hydrolysis of sugar cane bagasse
• Palma forrageira, bagaço de cana-de-açúcar e uréia para novilhas e vacas leiteiras
• Caracterização do bagaço de cana-de-açúcar para geração de energia
• Caracterização e aplicação da farinha do bagaço da cana-de-açúcar em bolo
• Selection of fungi able to hydrolyze bagasse sugar cane pre-treated