2-10　Reactivity of zelkova wood waste in CO₂ gasification

Abstract

Currently, Japan is dependent on imported coal, oil, and natural gas for resources. Therefore, the utilization of biomass, which are carbon neutral and abundant in Japan is needed. This study evaluated the CO₂ gasification of parts of zelkova tree char: trunk, branches, and bark. The CO₂ gasification was operated at atmospheric pressure and temperature was raised to 900°C with TG-DTA and product gas was analyzed GC-TCD. The results showed that the bark had a gasification start temperature ~ 30°C lower than the other parts of the tree. The highest amount of CO production was observed in the trunk, about 1.6 times higher than in the bark due to the higher carbon content in the trunk and the presence of reaction inhibitors such as silicon (Si). Therefore, CO₂ gasification of the bark has the advantage that it can be performed at relatively low energy. CO₂ gasification of the trunk has the advantage of producing more gas per mass.