SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2021, Vol. 36 ›› Issue (8): 146-156.DOI: 10.1016/j.cjche.2020.09.038

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Chemical looping catalytic gasification of biomass over active LaNixFe1-xO3 perovskites as functional oxygen carriers

Jingchun Yan1, Weidong Liu1, Rong Sun1, Shouxi Jiang2, Shen Wang1, Laihong Shen1   

  1. 1 Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China;
    2 College of Physics and New Energy, Xuzhou University of Technology, Xuzhou 221018, China
  • Received:2020-07-22 Revised:2020-09-22 Online:2021-09-30 Published:2021-08-28
  • Contact: Laihong Shen
  • Supported by:
    The authors gratefully acknowledge the support of this research work by the National Natural Science Foundation of China (51761135119) and the Scientific Research foundation of Graduate school of Southeast University (YBPY1906, YBJJ1606, YBJJ1703).

Chemical looping catalytic gasification of biomass over active LaNixFe1-xO3 perovskites as functional oxygen carriers

Jingchun Yan1, Weidong Liu1, Rong Sun1, Shouxi Jiang2, Shen Wang1, Laihong Shen1   

  1. 1 Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China;
    2 College of Physics and New Energy, Xuzhou University of Technology, Xuzhou 221018, China
  • 通讯作者: Laihong Shen
  • 基金资助:
    The authors gratefully acknowledge the support of this research work by the National Natural Science Foundation of China (51761135119) and the Scientific Research foundation of Graduate school of Southeast University (YBPY1906, YBJJ1606, YBJJ1703).

Abstract: Oxygen carriers (OCs) with perovskite structure are attracting increasing interests due to their redox tunability by introducing various dopants in the structure. In this study, LaNixFe1-xO3 (x=0, 0.1, 0.3, 0.5, 0.7, 1.0) perovskite OCs have been prepared by a citric acid-nitrate sol-gel method, characterized by means of X-ray diffraction (XRD) analysis and tested for algae chemical looping gasification in a fixed bed reactor. The effects of perovskite types, OC/biomass mass ratio (O/B), gasification temperature and water injection rate on the gasification performance were investigated. Lower Ni-doped (0 ≤ x ≤ 0.5) perovskites crystalized in the rhombohedra system which was isostructural with LaNiO3, while those with composition 0.5 ≤ x ≤ 1 crystalized in the orthorhombic system. Despite the high reactivity for LaNiO3, LaNi0.5Fe0.5O3 (LN5F5) was found to be more stable at a high temperature and give almost as good results as LaNiO3 in the formation of syngas. The relatively higher syngas yield of 0.833 m3·kg-1 biomass was obtained under the O/B of 0.4, water injection rate of 0.3 ml·min-1 and gasification temperature at 850℃. Continuous high yield of syngas was achieved during the first 5 redox cycles, while a slight decrease in the reactivity for LN5F5 after 5 cycles was observed due to the adhesion of small grains occurring on the surface of OCs. However, an obvious improvement in the gasification performance was attained for LN5F5 compared to raw biomass direct gasification, indicating that LN5F5 is a promising functional OC for chemical looping catalytic gasification of biomass.

Key words: Biomass, Chemical looping gasification, Oxygen carrier, La-Ni-Fe perovskite, Catalysis

摘要: Oxygen carriers (OCs) with perovskite structure are attracting increasing interests due to their redox tunability by introducing various dopants in the structure. In this study, LaNixFe1-xO3 (x=0, 0.1, 0.3, 0.5, 0.7, 1.0) perovskite OCs have been prepared by a citric acid-nitrate sol-gel method, characterized by means of X-ray diffraction (XRD) analysis and tested for algae chemical looping gasification in a fixed bed reactor. The effects of perovskite types, OC/biomass mass ratio (O/B), gasification temperature and water injection rate on the gasification performance were investigated. Lower Ni-doped (0 ≤ x ≤ 0.5) perovskites crystalized in the rhombohedra system which was isostructural with LaNiO3, while those with composition 0.5 ≤ x ≤ 1 crystalized in the orthorhombic system. Despite the high reactivity for LaNiO3, LaNi0.5Fe0.5O3 (LN5F5) was found to be more stable at a high temperature and give almost as good results as LaNiO3 in the formation of syngas. The relatively higher syngas yield of 0.833 m3·kg-1 biomass was obtained under the O/B of 0.4, water injection rate of 0.3 ml·min-1 and gasification temperature at 850℃. Continuous high yield of syngas was achieved during the first 5 redox cycles, while a slight decrease in the reactivity for LN5F5 after 5 cycles was observed due to the adhesion of small grains occurring on the surface of OCs. However, an obvious improvement in the gasification performance was attained for LN5F5 compared to raw biomass direct gasification, indicating that LN5F5 is a promising functional OC for chemical looping catalytic gasification of biomass.

关键词: Biomass, Chemical looping gasification, Oxygen carrier, La-Ni-Fe perovskite, Catalysis