4.7 Article

Defect Chemistry and Chemical Looping Performance of La1-xMxMnO3 (M = Sr, Ca, (x=0-0.5)) Perovskites

期刊

NANOMATERIALS
卷 12, 期 19, 页码 -

出版社

MDPI
DOI: 10.3390/nano12193461

关键词

perovskites; defect chemistry; chemical looping; Oxygen Transfer Capacity (OTC)

资金

  1. European Regional Development Fund of the European Union
  2. Greek national funds through the Operational Program Competitiveness, Entrepreneurship and Innovation [T1EDK-01532]

向作者/读者索取更多资源

In this study, La1-xMxMnO3 materials were synthesized and analyzed to investigate the relationship between their defect chemistry and their behavior in chemical looping processes. It was found that the fuel could react with different types of oxygen generated by different mechanisms within the materials, affecting the CO2/CO selectivity.
La1-xMxMnO3 (M = Sr, Ca, (x = 0-0.5)) materials of the perovskite structure are synthesized by a co-precipitation method. They are subsequently investigated for their performance in a chemical looping process (fuel CH4) using thermogravimetric analysis with simultaneous reaction. The goal of this work is to determine the relation between the defect chemistry of the materials and their behavior in chemical looping processes. A defect model is proposed that provides an explanation of the dependency of the Oxygen Transfer Capacity and of the CO2/CO selectivity on composition. It appeared that the fuel may react with various types of oxygen available within the materials, generated by different mechanisms. The relative amounts of each oxygen type determine the CO2/CO selectivity and depend on the material composition as well as on the partial pressure of oxygen used for regenerating the materials.

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