CO Oxidation at the Perimeters of an FeO/Pt(111) Interface and how Water Promotes the Activity: A First-Principles Study

被引：40

作者：

Gu, Xiang-Kui ^{[1
,2
]}

Ouyang, Runhai ^{[1
,2
]}

Sun, Dapeng ^{[1
,2
]}

Su, Hai-Yan ^{[1
,2
]}

Li, Wei-Xue ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

[2] Chinese Acad Sci, Dalian Inst Chem Phys, Ctr Theoret & Computat Chem, Dalian 116023, Peoples R China

来源：

CHEMSUSCHEM | 2012年 / 5卷 / 05期

关键词：

iron; oxidation; platinum; surface chemistry; supported catalysts; CERIA-SUPPORTED CATALYSTS; LOW-TEMPERATURE OXIDATION; TOTAL-ENERGY CALCULATIONS; ELASTIC BAND METHOD; GAS SHIFT REACTION; WAVE BASIS-SET; CARBON-MONOXIDE; PREFERENTIAL OXIDATION; OXYGEN ACTIVATION; GOLD NANOPARTICLES;

D O I：

10.1002/cssc.201100525

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The catalytic role of the Pt?Fe cation ensemble presented at the perimeters of the FeO film supported on Pt(111) for low-temperature CO oxidation and the promotion of water on activity were studied by using DFT calculations. We found that the perimeter sites along the edge of the FeO islands on Pt provided a favorable ensemble that consisted of coordinatively unsaturated ferrous species and nearby Pt atoms for O2 and H2O activation free from CO poison. A dissociative oxygen atom at the Pt?Fe cation ensemble reacts easily with CO adsorbed on nearby Pt. The OH group from water dissociation not only facilitates activation of the oxygen molecule, more importantly it opens a facile reaction channel for CO oxidation through the formation of the carboxyl intermediate. The presence of the OH group on the FeO film strengthens interfacial interactions between FeO and Pt(111), which would make the FeO film more resistant to further oxidation. The importance of the Pt?Fe cation ensemble and the role of water as a cocatalyst for low-temperature CO oxidation is highlighted.

引用

页码：871 / 878

页数：8

共 76 条

[1] Electrocatalysts for fuel cells [J].