Two types of wood char have been used in the experiments. The
first type of char is called commercial char. This char is generally
used in barbeque’s. The exact production process and the initial
material are unknown but it is known that the fixed carbon content
of this char is at least 82%. To study the particle size effect it has
been cut into the desired size manually (small: 10–15 mm, medium:
15–30 mm and large: 30–40 mm).