首页> 外文期刊>Applied Surface Science >A DFT study on CO oxidation on Pd_4 and Rh_4 clusters and adsorbed Pd and Rh atoms on CeO_2 and Ce_(0.75)Zr_(0.25)O_2 supports for TWC applications
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A DFT study on CO oxidation on Pd_4 and Rh_4 clusters and adsorbed Pd and Rh atoms on CeO_2 and Ce_(0.75)Zr_(0.25)O_2 supports for TWC applications

机译:DFT研究了Pd_4和Rh_4团簇上的CO氧化以及CeO_2和Ce_(0.75)Zr_(0.25)O_2上吸附的Pd和Rh原子对TWC应用的支持

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摘要

CO oxidation reaction mechanisms and energetics are examined on adsorbed Pd_4 and Rh_4 clusters and adsorbed Pd and Rh atoms on CeO_2 and Ce_(0.75)Zr_(0.25)O_2 support structures using DFT methods. Activation barriers and TS structures are computed with CI-NEB method. On cluster adsorbed systems, Zr affects CO binding position and O_2 adsorption mode. Energetically, formation of two CO_2 molecules without barrier and surface regeneration is possible only on Pd_4-CeO_2 surface. With metal atom substituted surfaces, Pd substituted Ce_(0.75)Zr_(0.25)O_2 and CeO_2 supports are found to be capable of completing catalytic cycle with consecutive CO oxidations by creating and filling surface oxygen vacancies.
机译:采用DFT方法研究了CeO_2和Ce_(0.75)Zr_(0.25)O_2载体结构上吸附的Pd_4和Rh_4簇以及吸附的Pd和Rh原子上的CO氧化反应机理和能量。用CI-NEB方法计算活化势垒和TS结构。在团簇吸附系统上,Zr影响CO的结合位置和O_2的吸附方式。从能量上讲,只有在Pd_4-CeO_2表面上才能形成没有屏障和表面再生的两个CO_2分子。发现具有金属原子取代的表面的Pd取代的Ce_(0.75)Zr_(0.25)O_2和CeO_2载体能够通过产生和填充表面氧空位来完成具有连续CO氧化的催化循环。

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