Effect of Metal Oxide Promoters on Low Temperature CO Oxidation over Water-Pretreated Pt/Alumina Catalysts
Effect of Metal Oxide Promoters on Low Temperature CO Oxidation over Water-Pretreated Pt/Alumina Catalysts
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DOI：
10.1007/s10562-014-1305-6
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发表时间：
2014-07
影响因子：
2.8
通讯作者：
A. Tomita;K. Shimizu;Y. Tai
中科院分区：
文献类型：
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作者：
A. Tomita;K. Shimizu;Y. Tai
在Pt/Al_2O_3催化剂上添加Mn、Fe、Co、Ni、Cu和Ce等过渡金属氧化物，并经水预处理，可提高催化剂的CO氧化活性。氧化铁是最有效的促进剂之间的-40和150 °C的那些检查。在120 °C以下，CO转化率在Fe与Pt摩尔比为1时最大化，而在120 °C以上，转化率随Fe含量单调增加。PtIII扩展X射线吸收精细结构分析表明，Pt-Fe合金的形成在高温下提高了CO氧化活性，但在低温下降低了CO氧化活性。图示摘要2.5wt%Pt/xwt%FeOx/Al 2 O3催化剂上的CO氧化
AbstractAddition of oxides of transition metals such as Mn, Fe, Co, Ni, Cu, and Ce to Pt/Al2O3catalysts followed by water-pretreatment enhanced its CO oxidation activity. Iron oxide was the most effective promoter between −40 and 150 °C among those examined. Below 120 °C, CO conversion was maximized at the Fe to Pt molar ratio of 1, whereas above 120 °C conversion increased monotonically with Fe content. PtLIIIextended X-ray absorption fine structure analyses suggested that the formation of Pt–Fe alloy enhanced CO oxidation activity at high temperatures but reduced it at low temperatures.Graphical AbstractCO oxidation over 2.5wt%Pt/xwt%FeOx/Al2O3catalysts