Abstract
In this paper, activity of sol–gel synthesized LaB0.5B′0.5O3 (B=Fe, Mn, B′=Fe, Mn, Co, Cu) perovskite catalysts was evaluated in catalytic reduction of NO by CO. Perovskite catalysts were characterized by XRD, BET, H2-TPR and SEM analysis. LaMn0.5Cu0.5O3 has the highest activity among LaB0.5B′0.5O3 perovskite catalysts (88% CO conversion and 93% NO conversion at 350°C). The superior activity of LaMn0.5Cu0.5O3 over other perovskite catalysts was associated to synergistic effect between Mn and Cu, higher reducibility at low temperature and more structural defects. The Langmuir–Hinshelwood mechanisms were used for Kinetic modeling of reduction of NO by CO. According to kinetic calculations, the most probable mechanism for this process was found to be the one based on dissociation of adsorbed NO (herein referred to as mechanism 1), according to which the experimental data was predicted at correlation coefficient of R2>0.99.
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