Degradation effect of diatomite on pyrolysis volatility of pine pellets

The development of efficient tar degradation catalyst is the research focus in the field of biomass thermal conversion. Considering the characteristics of diatomite, such as large specific surface area and stable chemical properties, a tar catalytic degradation technology using diatomite as catalyst was proposed. The degradation of pine pellets pyrolysis volatiles at different temperatures catalyzed by diatomite was studied. The results showed that diatomite could catalyze the degradation of condensable gas in pine pellet pyrolysis volatiles, and the liquid yield decreased, while the gas yield increased. Compared with no catalyst, the gas yield increased by 12.96% and the liquid yield decreased by 13.01% at 850 ℃. Adding bentonite into diatomite can effectively improve the mechanical strength of the catalyst. Compared with diatomite, bentonite will not reduce the catalytic degradation ability of liquid products. Under the catalysis of diatomite, the low calorific value and the content of each component of the gas product changed little.