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

Antigoni Evdou; Theofilos Georgitsis; Charitini Matsouka; Eleni Pachatouridou; Eleni Iliopoulou; Vassilios Zaspalis

doi:10.3390/nano12193461

Defect Chemistry and Chemical Looping Performance of La_1-xM_xMnO₃ (M = Sr, Ca, (x = 0-0.5)) Perovskites

Nanomaterials (Basel). 2022 Oct 3;12(19):3461. doi: 10.3390/nano12193461.

Authors

Antigoni Evdou¹, Theofilos Georgitsis², Charitini Matsouka^{1

2}, Eleni Pachatouridou¹, Eleni Iliopoulou¹, Vassilios Zaspalis^{1

2}

Affiliations

¹ Laboratory of Inorganic Materials, Laboratory of Environmental Fuels & Hydrocarbons, Chemical Process and Energy Resources Institute, Center for Research and Technology Hellas, 57001 Thessaloniki, Greece.
² Laboratory of Materials Technology, Faculty of Chemical Engineering, School of Engineering, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.

Abstract

La_1-xM_xMnO₃ (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.

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

Grants and funding

This research co-financed by the European Regional Development Fund of the European Union and Greek national funds through the Operational Program Competitiveness, Entrepreneurship and Innovation, under the call RESEARCH–CREATE–INNOVATE (project code:T1EDK- 01532).