Abstract
Wood has been very useful in many fields due to its excellent properties. However, it also has less attractive characteristics, like high hygroscopicity and low bioconversion efficiencies. Heat treatment has been proved to improve these properties making lignocellulosic materials a stronger alternative to non-renewable sources to produce energy and other products. This study focused on the structural changes of heat treated poplar (populus) wood specimens treated under different temperature conditions. Nitrogen adsorption, pore size distribution and specific surface area of heat treated wood were studied. Increasing the temperature of treatment leads to a change on the characteristics of the nitrogen adsorption isotherms. The volume of pores for samples treated at higher temperatures is much greater comparing with samples below 400 oC BET specific surface areas were generally low for samples at temperatures until 400 oC, after this a great increase occurred while increasing temperatures up to 500 oC (413,06 m2/g).
Highlights
As wood continues to be very useful for many fields and applications, mainly because of its many excellent material properties, it has some disadvantages
The objective of this thesis is to study the structural changes of poplar wood after thermal treatment, in order to assess the effect of different temperature conditions on the characteristics of the lignocellulosic biomass studied
Model Density Functional Theory (DFT) nitrogen isotherms were fit to the experimental isotherms using a deconvolution technique by a non-negative least squares method, as described in previous studies, (Olivier, Conklin, and Szombathely 1994) to calculate the pore size distribution
Summary
As wood continues to be very useful for many fields and applications, mainly because of its many excellent material properties (such as an incredible strength to weight ratio, appearance etc.), it has some disadvantages. Wood is a natural material, and because of that it exhibits great range of variation in its properties. Variations occur between tree species, between trees of the same species and within the tree itself. This can lead to problems for any study of the material, making it difficult to obtain comparable results. In the great majority of reviews related with wood sciences (or any other kind of science), it is detected that, sometimes, disagreements appear between different studies, and it is not always possible to reach a consensus
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