The influence of two typical alkali and alkaline earth metal (AAEM)

sodium and magnesium

on the gas releasing kinetics during rice husk high-temperature pyrolysis was investigated in a micro-fluidized bed reactor (MFBRA).Reaction kinetics for generating four main gases (H2

CO

CH4 and CO2) was deduced based on universal integral method.Results indicated that different gas components had different times to start and end the gas releasing process

indicating different evolution routes and mechanics for generating these gas species.The conversion rate of four gases could be promoted at higher temperature or with the presence of AAEM.The gas releasing process was calculated by linear fitting method based on typical gas-solid reaction models and the most probable mechanism functions of four gas components were obtained at different conditions.The kinetic parameters of gaseous products calculated by most probable mechanism functions indicated that the resulting apparent activation energies for four gases decreased in presence of sodium and magnesium.Particularly

the effect of the two metal irons on the formation of CO was more obvious compared with the other gas species.From this study

the influence of two metal ions on biomass pyrolysis characteristics was confirmed on the basis of the variation of the activation energy.