Catalytic CO Oxidation over Well-Defined Cobalt Oxide Nanoparticles: Size-Reactivity Correlation

被引：129

作者：

Iablokov, Viacheslav ^{[1
]}

Barbosa, Roland ^{[1
,3
]}

Pollefeyt, Glenn ^{[2
]}

Van Driessche, Isabel ^{[2
]}

Chenakin, Sergey ^{[1
]}

Kruse, Norbert ^{[1
,3
]}

机构：

[1] Univ Libre Bruxelles, Chem Phys Mat, B-1050 Brussels, Belgium

[2] Univ Ghent, Dept Inorgan & Phys Chem, SCRiPTS, B-9000 Ghent, Belgium

[3] Washington State Univ, Voiland Sch Chem Engn & Bioengn, Pullman, WA 99164 USA

来源：

ACS CATALYSIS | 2015年 / 5卷 / 10期

关键词：

particle size effect; cobalt nanoparticles; Co3O4; nanoparticles; catalytic CO oxidation; XPS; CARBON-MONOXIDE OXIDATION; LOW-TEMPERATURE OXIDATION; METAL-OXIDES; CO3O4; NANOCRYSTALS; OXYGEN; HYDROCARBONS; CHEMISTRY; SURFACES; PHASE;

D O I：

10.1021/acscatal.5b01452

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：

Co nanoparticles of well-defined size were synthesized by temperature-controlled injection of Co-2(CO)(8) into dichlorobenzene. After intercalation into mesoporous MCF-17 and temperature-programmed oxidation, Co3O4/MCF-17 model catalysts were obtained with cobalt oxide particle sizes varying between 3.5 and 12.2 nm. We demonstrate here the occurrence of a distinct particle size effect for the CO oxidation. Maximum reaction rates of about 0.77 nm(-2) s(-1) at 150 degrees C were observed for Co3O4 particles with a size in the range of 5 to 8 nm. The reaction rates decreased for either smaller or larger sizes. X-ray photoelectron spectroscopy allowed establishing a clear correlation between the Co3+ trivalent oxidation state and the CO oxidation rate.

引用

页码：5714 / 5718

页数：5

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