CO oxidation by Ti- and Al-doped ZnO: Oxygen activation by adsorption on the dopant

被引：61

作者：

Pala, Rai Ganesh S. ^{[1
]}

Tang, Wei ^{[1
]}

Sushchikh, Michael M. ^{[2
]}

Park, Jung-Nam ^{[2
]}

Forman, Arnold J. ^{[1
]}

Wu, Guang ^{[1
]}

Kleiman-Shwarsctein, Alan ^{[3
]}

Zhang, Jingping ^{[3
]}

McFarland, Eric W. ^{[2
]}

Metiu, Horia ^{[1
]}

机构：

[1] Univ Calif Santa Barbara, Dept Chem & Biochem, Santa Barbara, CA 93106 USA

[2] Univ Calif Santa Barbara, Dept Chem Engn, Santa Barbara, CA 93106 USA

[3] Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA

来源：

JOURNAL OF CATALYSIS | 2009年 / 266卷 / 01期

关键词：

CO oxidation; Catalysis; Doped oxide; Ti; Al; ZnO; O-18(2); PROMOTED MAGNESIA CATALYST; TOTAL-ENERGY CALCULATIONS; NO REDUCTION; HYDROCARBON OXIDATION; PEROVSKITE CATALYSTS; INTELLIGENT CATALYST; RUTILE TIO2(110); SOLID-SOLUTIONS; HIGH-RATES; METHANE;

D O I：

10.1016/j.jcat.2009.05.011

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Using a combination of theory and experiments, we show that ZnO substitutionally doped with Ti or Al oxidizes CO by several parallel reaction pathways that differ from the traditional Mars-van Krevelen (MVK) mechanism. in one, the dopant atoms at the surface of the doped oxide adsorb and activate O-2 so that it reacts with CO. In the other, a surface oxygen atom from the lattice next to the dopant, D, moves onto the dopant and creates an O-D group and an oxygen vacancy. The O-D group is capable of oxidizing a reductant. To test these predictions made by theory, we have prepared Ti- and M-doped ZnO and have shown that these compounds oxidize CO at temperatures at which pure-phase ZnO, Al2O3, or TiO2 do not. The proposed mechanisms were made plausible by studying CO oxidation with O-18(2). (C) 2009 Elsevier Inc. All rights reserved.

引用

页码：50 / 58

页数：9

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