Abstract
La1-xSrxAlO3 (x=0 to 0.4) perovskite materials were synthesized by reverse strike co-precipitation method and their soot oxidation activity were evaluated. All the catalysts synthesized were characterized using XRD, BET specific surface area, FESEM and XPS techniques. As analyzed by XRD, La1-xSrxAlO3 perovskite from x=0 to 0.35 showed the formation of the rhombohedral phase, while for La0.6Sr0.4AlO3 sample the secondary phases SrO, La2O3, and Al2O3 were also noticed. Sr-doped samples exhibited higher BET specific surface area when compared to pure LaAlO3. FESEM analysis showed that there is a change in morphology upon doping of Sr into LaAlO3 lattice. The O1s spectra observed from XPS analysis showed that the La0.75Sr0.25AlO3 sample contained higher amounts of adsorbed oxygen. La, Sr, and Al existed in +3, +2 and +3 oxidation states respectively in all the synthesized samples as confirmed by XPS. Soot oxidation activity tests showed that La0.75Sr0.25AlO3 exhibited higher catalytic activity relative to other catalysts due to the enhanced amount of reactive adsorbed oxygen species.
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