☆ 4.8 Article

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

JOURNAL OF CATALYSIS (2009)

期刊

JOURNAL OF CATALYSIS

卷 266, 期 1, 页码 50-58

出版社

ACADEMIC PRESS INC ELSEVIER SCIENCE

DOI: 10.1016/j.jcat.2009.05.011

关键词

CO oxidation; Catalysis; Doped oxide; Ti; Al; ZnO; O-18(2)

类别

Chemistry, Physical Engineering, Chemical

资金

Air Force Office of Scientific Research [FAA9550-06-1-0167]
U.S. Department of Energy Division of Basic Energy Sciences [DE-FG03-89ER14048]

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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.

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