Synthesis of Perovskite-Type La0.7Sr0.3Co0.5Fe0.5O3-δ Oxide Membranes and Their Oxygen Permeation Performance in Different Atmospheres for Carbon Dioxide-Oxygen Separation

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

Edoardo Magnone¹  Jong pyo Kim²  Yongtaek Lee²  Jung hoon Park¹ 

[1] Greenhouse Gas Research Center, Climate Change Technology Research Division, Korea Institute of Energy Research;Department of Chemical Engineering, Chungnam National University

关键词: Oxides;    Properties of Materials;    Microstructure;    Ceramic Membrane;    Oxygen Permeation;   

DOI  :  10.1252/jcej.11we019

来源: Maruzen Company Ltd

【 摘 要 】

References(37)Cited-By(2)In the present study, La0.7Sr0.3Co0.5Fe0.5O3-δ powders have been prepared by thermal decomposition of amorphous citrate precursors by calcination at high temperature. The material properties are characterized by thermogravimetric-differential thermal analysis, X-ray diffraction, and four probe method. A perovskite structure with rhombohedral symmetry has been certified for the selected La0.7Sr0.3Co0.5Fe0.5O3-δ oxide membranes. The electrical conductivity of sintered La0.7Sr0.3Co0.5Fe0.5O3-δ ceramics increases with temperature through a maximum, then decreases at relatively higher temperatures, due to oxygen vacancy formation. Oxygen permeation was performed between 700 and 950°C under different oxygen partial pressures (0.21, 0.42, and 0.63 atm) and carbon dioxide concentrations (300, 500, and 700 ppm). According to Arrhenius' law, the oxygen permeation flux of the membranes with a thickness of 1.1 mm increases with temperature and oxygen partial pressure. A maximum oxygen flux of ~0.33 mL/min · cm2 and ~0.25 mL/cm2 · min was measured at 950°C at high oxygen pressure (PO2 = 0.63 atm) and under carbon dioxide concentration range from 300 to 700 ppm, respectively.

【 授权许可】

Unknown