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首页> 外文期刊>Journal of industrial and engineering chemistry >The role of Fe on PtPd oxidation catalyst prepared by simultaneous and sequential incipient wetnesses
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The role of Fe on PtPd oxidation catalyst prepared by simultaneous and sequential incipient wetnesses

机译：铁在同时湿润和连续湿润制备的PtPd氧化催化剂上的作用

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摘要

The roles and effects of Fe on the catalytic performance and physicochemical properties of a PtPd diesel oxidation catalyst prepared by three different methods were investigated by CO oxidation reaction, X-ray diffraction, temperature-programmed reduction (TPR), temperature-programmed oxidation, and BET surface area. It was found that the roles of Fe depended strongly on the sequential order of Fe introduction during the preparation of the PtPd catalyst. The Fe/PtPd/Al2O3 catalyst was prepared by introducing Fe onto the PtPd/Al2O3, and the PtPd/Fe/Al2O3 catalyst was obtained by loading the PtPd onto the Fe/Al2O3. The former had a superior activity. From the TPR results, the catalytic activity of CO oxidation was correlated with the oxygen mobility of the iron oxides. For PtPd/Fe/Al2O3, the iron interacted preferentially with the alumina support forming FeAlO3, which resulted in the stabilization of the support and a reduction in the surface area. The major role of Fe was to promote the enhancement of the catalytic activity of PtPd through an intimate interaction between the PtPd and iron oxides, which had lattice oxygens to generate oxygen with oxidation abilities.
机译：通过CO氧化反应，X射线衍射，程序升温还原（TPR），程序升温氧化和还原反应，研究了Fe对三种不同方法制备的PtPd柴油机氧化催化剂的催化性能和理化性质的作用和影响。 BET表面积。已发现Fe的作用在很大程度上取决于PtPd催化剂制备过程中Fe引入的顺序。通过将Fe引入到PtPd / Al2O3上来制备Fe / PtPd / Al2O3催化剂，并且通过将PtPd加载到Fe / Al2O3上来获得PtPd / Fe / Al2O3催化剂。前者具有较高的活动性。从TPR结果来看，CO氧化的催化活性与氧化铁的氧迁移率相关。对于PtPd / Fe / Al2O3，铁优先与氧化铝载体相互作用形成FeAlO3，这导致了载体的稳定化和表面积的减小。 Fe的主要作用是通过PtPd和氧化铁之间的紧密相互作用来促进PtPd催化活性的增强，氧化铁具有晶格氧生成具有氧化能力的氧。

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