EFB showed the lowest gas yield. In composition of gas, carbon
oxides (mainly CO2) were dominant at ca. 94–97 wt.%. CO2 is produced
by the primary pyrolysis of cellulose and hemicellulose [22];
CH4 and CO are mainly produced by the secondary cracking of volatiles
[13]. Methane was produced at 2.7–5.4 wt.% and hydrogen at
0.1–0.3 wt.% because the experimental conditions were chosen to
maximize primary cracking. The composition of gas products did
not vary greatly between the biomass types, and these results
agreed well with previous works on fast pyrolysis [12,13].