A Cu-Mn bimetallic composite was prepared as an oxygen carrier (OC) for biomass chemical looping gasification (BCLG) using a mechanical mixing method to improve the gasification effect. The effect of Cu-Mn OC on pine sawdust char gasification was investigated by thermogravimetric experiments, which showed that the addition of oxygenate carrier had a significant promotion effect on pine sawdust char gasification. The kinetic analysis was carried out based on the thermogravimetric data, and the results showed that the pine sawdust char gasification process was consistent with the 3-D diffusion (sphere) D4 model at the conversion rate of 0.25-0.4 and the power law (n=4) F4 model at the conversion rate of 0.4-0.75. Thermal experiments of gasification were conducted using a fixed bed to investigate the effects of oxygen carrier, heating rate, oxygen carrier/biomass char (OC/B) mass ratio, and temperature on the syngas yielded by the biomass gasification process. It was found that the heating rate increases the heating value of the syngas, but decreases the gas yield. In addition when the OC/B is 2.5:1 and the temperature is 850°C, the syngas has a better quality. The results of XRD and EDM analysis indicated that after the gasification reaction the Cu-Mn OC was oxygen uncoupled to form Cu_xMn_2-xO₂ and no sintering occurred. The EDS analysis reveals a small amount of C elements on the surface of the Cu-Mn OC.A Cu-Mn bimetallic composite was prepared as an oxygen carrier (OC) for biomass chemical looping gasification (BCLG) using a mechanical mixing method to improve the gasification effect. The effect of Cu-Mn OC on pine sawdust char gasification was investigated by thermogravimetric experiments, which showed that the addition of oxygenate carrier had a significant promotion effect on pine sawdust char gasification. The kinetic analysis was carried out based on the thermogravimetric data, and the results showed that the pine sawdust char gasification process was consistent with the 3-D diffusion (sphere) D4 model at the conversion rate of 0.25-0.4 and the power law (n=4) F4 model at the conversion rate of 0.4-0.75. Thermal experiments of gasification were conducted using a fixed bed to investigate the effects of oxygen carrier, heating rate, oxygen carrier/biomass char (OC/B) mass ratio, and temperature on the syngas yielded by the biomass gasification process. It was found that the heating rate increases the heating value of the syngas, but decreases the gas yield. In addition when the OC/B is 2.5:1 and the temperature is 850°C, the syngas has a better quality. The results of XRD and EDM analysis indicated that after the gasification reaction the Cu-Mn OC was oxygen uncoupled to form Cu_xMn_2-xO₂ and no sintering occurred. The EDS analysis reveals a small amount of C elements on the surface of the Cu-Mn OC.

Chemical looping gasification,Cu-Mn composite oxygen carrier,Kinetic,Syngas,biomass char