Applied Surface Science, Vol.489, 80-91, 2019
Combustion synthesized A(0.5)Sr(0.5)MnO(3-delta) perovskites (where, A = La, Nd, Sm, Gd, Tb, Pr, Dy, and Y) as redox materials for thermochemical splitting of CO2
In this paper, A(0.5)Sr(0.5)MnO(3) perovskites (where, A = La, Nd, Sm, Gd, Tb, Pr, Dy, and Y) were examined towards thermochemical CO2 splitting (CS) reaction. The solution combustion synthesis (SCS) method was employed for the preparation of the A(0.5)Sr(0.5)MnO(3) perovskites, in which glycine was used as the fuel. The characterization of the as-prepared and reacted A(0.5)Sr(0.5)MnO(3) perovskites was accomplished by means of powder X-ray diffractometer (PXRD), scanning electron microscope (SEM), and energy dispersive X-ray spectroscopy (EDS). A Seteram Setsys Evolution TGA set-up was utilized to estimate the amounts of O-2 released (n(O2)) and CO produced (n(CO)) by each SCS synthesized the A(0.5)Sr(0.5)MnO(3) perovskites attained thermal and redox stability from second thermochemical cycle. It was also understood that all the A(0.5)Sr(0.5)MnO(3) perovskites shows significantly higher n(O2) and nCO as compared to the phase pure CeO2. Among all the A(0.5)Sr(0.5)MnO(3) perovskites investigated, PrSM shows maximum n(O2) = 144.8 mu mol/g.cycle and n(CO) = 252.3 mu mol/g.cycle with an average CO/O-2 molar ratio of 1.74. The experimental findings also indicate that the fuel production aptitude of all the A(0.5)Sr(0.5)MnO(3) perovskites can be upsurged if longer CS reaction time is employed.
Keywords:Perovskites;Solution combustion synthesis;CO2 splitting;Thermogravimetric analyzer;Thermochemical cycles