Abstract
Perovskite formulations of LaB0.5Co0.5O3 (B=Cr, Mn and Cu) were examined and evaluated as catalyst for reduction of NOx by CO. Among the different and various formulations, LaMn0.5Co0.5O3 showed the highest activityselectivity with 89.84% conversion of NO and 9.62% yield of N2O at 400 °C. Therefore, more precise evaluations were implemented on LaMnxCo1-xO3 to find the optimum formulation. The LaMn0.25Co0.75O3 included the maximum performance (68.79% conversion of NO at 350 °C and 92.85% at 400 °C) and N2O yield (9.01); therefore, it was selected as optimum catalyst. Characterization methods were utilized to correlate activity and physical-chemical properties. The presented activity and reducibility of catalysts were improved due to partial substitution of Co3+ by B cation. Finally, no direct relationship was found between surface area and catalyst activity. The optimum catalyst showed complete activity-selectivity higher than 450 °C.
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