Pyrolysis of hardwoods residues: on kinetics and chars characterization

P. A. DELLA ROCCA; E. G. CERRELLA; P. R. BONELLI; A. L. CUKIERMAN

BIOMASS AND BIOENERGY

ELSEVIER LTD

Lugar: OXFORD, UK; Año: 1999 vol. 16 p. 79 - 88

0961-9534

Evolution of chemical and textural±morphological features characterizing two native Argentinean hardwood species (Aspidosperma Quebracho Blanco Schlecht and Aspidosperma Australe) subjected to pyrolysis at di?erent operating conditions is analysed by several techniques. Surface areas of raw materials and pyrolysed samples are evaluated from physical adsorption measurements employing N2 at 77 K and CO2 at 298 K. The samples are also examined by optical and scanning electronic microscopy. Results point to signi®cant feature changes, which are, in general, strongly a?ected by pyrolysis conditions, particularly temperature. Furthermore, kinetic measurements of woods pyrolysis are performed by non-isothermal thermogravimetric analysis, from ambient temperature up to 1123 K. A deactivation model reported in the literature, which predicts an increase of activation energy with reaction extent, successfully describes kinetic data for both species over the whole range of degradation temperatures.