Thermal decomposition of black locust and wheat straw under torrefaction

Barta-Rajnai, Eszter and Czégény, Zsuzsanna and Sebestyén, Zoltán and May, Zoltán and Bozi, János and Jakab, Emma (2015) Thermal decomposition of black locust and wheat straw under torrefaction. In: 8th International Symposium on Feedstock Recycling of Polymeric Materials, 2015. szeptember 7-10., Leoben (Austria).

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Abstract

In this work the torrefaction of two typical Hungarian biomass materials, wheat straw and black locust wood was studied. Three different torrefaction temperatures were applied: 225, 250 and 300°C with one hour isothermal period. The untreated and torrefied biomass materials were characterized by thermogravimetric analysis (TGA) and pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) techniques. The alkali ion contents of the samples were determined by ICP-OES technique. It was found that the thermal treatment at 225°C for 1 hour modifies the thermal decomposition mechanism of the cellulose content of the sample, indicating chemical changes in the cellulose structure. At 250°C the hemicellulose content of the analyzed biomass materials partially decomposes. Furthermore, the most labile lignin groups (terminal CH2OH) also start to decompose. At 300°C torrefaction temperature the major part of hemicellulose and cellulose decomposes. The degree of the cellulose decomposition highly correlates with the alkali ion content of the samples.

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