3.2. Product yields
In general, comparison of pyrolysis behavior of brown coals and biomass shows significant differences, due to the fact of varying compositions (see Table 1). While brown coals possess a very continuous decrease in char yield according to rising temperatures within the investigated temperature range (see Fig. 2a), biomass shows a main decomposition stage within a narrow temperature range, starting at 200–250 °C and ending at 350–400 °C with a mass loss of up to 70 wt.% (daf) (see Fig. 2 b). Wheat straw starts pyrolysis first, followed by maize silage and spruce wood