Controlling the Reaction Microenvironments Through an Embedding Strategy to Strengthen the Chemical Looping Reforming of Biomass Volatile Based on Decoupling Process

Given the complexity of the traditional biomass gasification technology with low conversion efficiency and high tar content, this paper proposed a new reaction decoupling process of biomass pyrolysis and chemical looping reforming of volatile components. Designing a high activity and selective oxygen carrier is critical to directional conversion of biomass pyrolysis volatiles into syngas during the chemical looping reforming process. An embedding strategy was used to design the oxygen carrier—NiFe 2 O 4 was embedded in SBA-15 to controlling the reaction microenvironment and prepared by the impregnation method. Reaction performance of NiFe 2 O 4 @SBA-15 under different conditions was investigated by a combination of fixed-bed reactor and on-line mass spectrometry. After embedding, the reaction performance NiFe 2 O 4 @SBA-15was significantly improved than NiFe 2 O 4 , and the CH 4 conversion and CO selectivity were increased by 121.29% and 114.40%, respectively. The optimal embedding ratio (20%) and reaction temperature (900 o C) were determined, which was consistent with the thermodynamic simulation results. Real-time reaction characterization indicated that the CO selectivity was close to 100%. The gas-solid reaction model was used to solve the reaction kinetics of the oxygen carrier and the activation energy was 118.225 kJ·mol -1 . This research was of great significance for screening oxygen carrier and the design of reactor in directional conversion of biomass pyrolysis full volatiles into syngas via chemical looping reforming