Abstract: Catalytic pyrolysis of fresh corn stalk(CS) and wheat straw(WS) have been carried out by TG/DTG/DTA technology in the atmosphere of N₂ with K₂CO₃, Na₂CO₃, ZnCl₂ and CaO as catalyst, respectively. Catalytic pyrolysis of fresh biomass and the influences of the kinds of catalyst and the catalyst weight/biomass weight ratios on pyrolysis of fresh biomass were analyzed. The results indicate that pyrolysis characteristic of fresh biomass is better than stored biomass. The addition of catalysts leads to redistributing of volatile of fresh biomass during pyrolysis in different temperature ranges, and the main pyrolysis of biomass was moved to lower temperature range, with increased yields of volatile. The addition of calcium oxide leads to the largest yields of volatile. The influences of K₂CO₃ and Na₂CO₃ on biomass pyrolysis characteristics are similar. Increasing of K₂CO₃ weight/biomass weight ratio results in increasing of yields of volatile, increasing of initial thermal decomposition temperature and increasing of main pyrolysis temperature range of biomass. It is suitable for hydrodysis of biomass at K₂CO₃ dose of 10%-15%.

Key words: fresh biomass, catalytic pyrolysis, catalyst, TG/DTG/DTA