The Catalytic Performance of A-site Defect Perovskite LaxSr0.2FeO3 for Lignin Pyrolysis
WANG Haiying1,2, MOU Runqing2, ZHANG Wencheng1, ZHANG Yongjun1, HAN Hongjing2, ZHAO Ziqing2, CHEN Yanguang2, ZHANG Yanan2
1. PetroChina Daqing Petrochemical Research Center, Daqing 163714, China;
2. School of Chemistry and Chemical Engineering, Northeast Petroleum University, Daqing 163318, China
Abstract：As the second largest biomass resource, lignin has a low utilization rate. Catalytic pyrolysis of lignin can produce high-valued chemicals such as phenols. In this study, A-site deficient perovskite LaxSr0.2FeO3 (x=0.8, 0.7, 0.6, 0.5) was prepared by the sol-gel method, and its performance for catalyzing bagasse lignin pyrolysis was investigated in a micro fixed bed reactor. When x≥0.6, pure perovskite could be synthesized, while with the further reduction of x, Fe2O3 was produced and blocked the mesopores, resulting in a decrease in specific surface area. By creating A-site defects, both the amount of oxygen vacancies and the proportion of adsorbed oxygen (Oads) were increased, and the proportion of Oads reached the maximum value at x=0.6. LaxSr0.2FeO3 could promote lignin pyrolysis, among which La0.6Sr0.2FeO3 showed the best effect with the highest liquid yield (27.9%) and selectivity of phenolic compounds (76.3%). After multiple catalyzation-regeneration cycles, perovskite exhibited satisfactory structural and catalytic stability.
WANG Haiying,MOU Runqing,ZHANG Wencheng et al. The Catalytic Performance of A-site Defect Perovskite LaxSr0.2FeO3 for Lignin Pyrolysis[J]. Chemical Reaction Engineering and Technology, 2025, 41(2): 262-270.
