Hydrogen, Год журнала: 2025, Номер 6(2), С. 27 - 27
Опубликована: Апрель 17, 2025
This study comparatively evaluates the performance of ABO3 perovskite materials (A = La, Ca, Sr; B Mn, Fe) as oxygen carriers in three-step Chemical Looping Hydrogen (CLH) technology, focusing on redox behavior, transport capacity, hydrogen production, and selectivity under controlled pulse-mode conditions. The behavior is analyzed relation to their defect chemistry. Perovskites such (La1−xCax)MnO3, (La1−xSrx)MnO3, (La0.6Ca0.4)(Mn1−xFex)O3 were synthesized via wet chemical methods tested looping cycles. Doping A-site cations with Ca or Sr enhanced delivery capacity by more than 100% upon reduction CH4 when dopant content (x) increased from 0 0.5. However, H2 decreased 52% 2.5% for (La1−xCax)MnO3 46% 14% (La1−xSrx)MnO3 same In contrast, substituting Mn Fe significantly improved particularly LaFeO3, which exhibited highest yield. At 1000 °C, LaFeO3 produced nearly 10 mmol g−1, 80% generated during step at 99.9% remaining 20% water-splitting selectivity. These results are linked extent B-site cation reactions (i) B4+ → B3+, facilitates complete fuel oxidation (ii) B3+ B2+, leads partial oxidation. reverse also contributes production water splitting. Additionally, assesses materials’ microstructure stability over prolonged findings highlight Fe-based perovskites, promising candidates CLH applications, emphasizing need structural compositional optimization enhance efficiency.
Язык: Английский