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首页> 外文期刊>ACS applied materials & interfaces >Pd/SrFe1-xTixO3-delta as Environmental Catalyst: Purification of Automotive Exhaust Gases
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Pd/SrFe1-xTixO3-delta as Environmental Catalyst: Purification of Automotive Exhaust Gases

机译：PD / SRFE1-XTIXO3-DELTA作为环境催化剂：汽车废气净化

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摘要

Environmental catalysts are required to operate highly efficiently under severe conditions in which they are exposed to reductive and oxidative atmospheres at high temperatures. This study demonstrates that SrFe1-xTixO3-delta-supported Pd catalysts exhibit high catalytic activities for NO reduction with C3H6 and CO in the presence of O-2, which is a model reaction for the purification of automotive exhaust gases. Catalytic activity is enhanced with increasing Ti content, and the highest activity is observed for Pd/SrFe0.2Ti0.8O3-delta among the examined catalysts. The state of the loaded Pd species can be controlled by the Fe/(Fe + Ti) ratio in SrFe1-xTixO3-delta, and highly active PdO nanoparticles are properly anchored on SrFe0.2Ti0.8O3-delta. The Tirich Pd/SrFe0.2Ti0.8O3-delta shows significantly higher catalytic activity and is more thermally stable than the conventional Pd/Al2O3, which has a high surface area. Since Fe-rich SrFe1-xTixO3-delta has the high oxygen storage capacity, its response capabilities to atmospheric fluctuations were evaluated by changing the oxygen concentration during NO reduction. As a result, Fe-rich Pd/SrFe0.8Ti0.2O3-delta retains its high NO-reduction activity for longer times even under oxidative conditions, when compared to SrFeO3-delta or Ti-rich Pd/SrFe1-xTixO3-delta. The oxygen storage properties of Pd/SrFe0.8Ti0.2O3-delta allow it to effectively act as an oxygen buffer for NO reduction. These properties ensure that the SrFe1-xTixO3-delta support, with both high thermal stability and oxygen storage capacity, is a very useful environmental-catalyst material.
机译：需要在高温下暴露于还原和氧化气氛的严重条件下高效地操作环境催化剂。该研究表明，SRFE1-Xtixo3-Delta-Shortap的Pd催化剂表现出高催化活性，其在O-2存在下没有C3H6和CO的含量没有减少，这是用于纯化汽车废气的模型反应。随着Ti含量的增加，催化活性增强，并且在检查的催化剂中观察到Pd / srFe0.2Ti0.8O3-Delta的最高活性。所载的PD物种的状态可以通过SRFE1-Xtixo3-Delta中的Fe /（Fe + Ti）的比率控制，并且高活性PDO纳米粒子在SRFE0.2Ti0.8O3-Delta上适当地固定。 Tirich PD /SRFE0.2TI0.8O3δ显示出明显较高的催化活性，并且比具有高表面积的常规Pd / Al2O3更热稳定。由于Fe Rich SRFE1-Xtixo3-Delta具有高氧气储存能力，因此通过在没有减少期间改变氧气浓度来评估其对大气波动的响应能力。结果，与SRFEO3-DELTA或TI-SRFE1-XtixO3-DERTA相比，Fe-富含Fe0.2O3-Delta即使在氧化条件下，即使在氧化条件下也保持高的无减少活性。 PD / SRFE0.8Ti0.2O3-Delta的氧气储能性能使其有效地用作氧气缓冲液，以便无减少。这些属性确保SRFE1-Xtixo3-Delta支持具有高热稳定性和氧气储存能力，是一种非常有用的环境催化剂材料。

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