Experimental and Theoretical Study of CO Oxidation on PdAu Catalysts with NO Pulse Effects

被引：14

作者：

Hao, Xianghong ^{[3
]}

Shan, Bin ^{[3
]}

Hyun, Jangsuk ^{[3
]}

Kapur, Neeti ^{[3
]}

Fujdala, Kyle ^{[3
]}

Truex, Timothy ^{[3
]}

Cho, Kyeongjae ^{[1
,2
,3
]}

机构：

[1] Univ Texas Dallas, Dept Mat Sci & Engn, Richardson, TX 75080 USA

[2] Univ Texas Dallas, Dept Phys, Richardson, TX 75080 USA

[3] Nanostellar Inc, Redwood City, CA 94063 USA

来源：

TOPICS IN CATALYSIS | 2009年 / 52卷 / 13-20期

关键词：

PdAu; CO oxidation; NO; DFT; CLOSE-PACKED TRANSITION; VINYL-ACETATE SYNTHESIS; METAL SURFACES; AU; TEMPERATURE; ADSORPTION; GOLD; ACETYLENE; KINETICS; PT(111);

D O I：

10.1007/s11244-009-9378-y

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The effect of NO on CO oxidation was studied for Pt, Pd and PdAu catalysts. It was found that NO inhibits significantly the CO oxidation reactivity on both Pt and Pd catalysts. On PdAu catalyst, however, the presence of NO resulted in an enhancement of CO oxidation activity. In order to gain an atomistic understanding of this effect, density-function theory (DFT) calculations were performed on the adsorption and reaction properties of NO and CO on these metal surfaces. We have identified that the inhibition effects on Pt and Pd catalysts are due to stronger NO binding, and that the enhanced reactivity on PdAu is due to the reduced NO oxidation barrier on PdAu leading to NO2 formation.

引用

页码：1946 / 1950

页数：5

共 25 条

[21]

Sinfelt J.H., 1983, BIMETALLIC CATALYSIS

[22] Segregation at the surface of an Au/Pd alloy exposed to CO [J].

Soto-Verdugo, Victor ;

Metiu, Horia .

SURFACE SCIENCE, 2007, 601 (23) :5332-5339

[23] Hydrogenation of aromatics over Au-Pd/SiO2-Al2O3 catalysts;: support acidity effect [J].

Venezia, AM ;

La Parola, V ;

Pawelec, B ;

Fierro, JLG .

APPLIED CATALYSIS A-GENERAL, 2004, 264 (01) :43-51

[24] The composition and structure of Pd-Au surfaces [J].

Yi, CW ;

Luo, K ;

Wei, T ;

Goodman, DW .

JOURNAL OF PHYSICAL CHEMISTRY B, 2005, 109 (39) :18535-18540

[25] A general mechanism for CO oxidation on close-packed transition metal surfaces [J].

Zhang, CJ ;

Hu, PJ ;

Alavi, A .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1999, 121 (34) :7931-7932

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