Journal
JOURNAL OF CATALYSIS
Volume 352, Issue -, Pages 282-292Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2017.05.016
Keywords
Mesoporous transition metal oxides; Cobalt monoxide; Divalent cobalt species; O-xylene oxidation; Oxygen activation ability
Categories
Funding
- NSF of China [21377008, 21677004, 21477005]
- National High Technology Research and Development Program of China (863 Program) [2015AA034603]
- Beijing Nova Program [Z141109001814106]
- NSF of Beijing Municipal Commission of Education [KM201410005008]
- Scientific Research Base Construction-Science and Technology Creation Platform-National Materials Research Base Construction
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Cobalt oxide is a typical transition metal oxide that exhibits high catalytic activity for the total oxidation of volatile organic compounds. In this study, a reduction process in a glycerol solution was adopted to generate mesoporous CoO (meso-CoO) or CoOx (meso-CoOx) from mesoporous Co3O4 (meso-Co3O4). The obtained samples were rich in Co2+ species and exhibited high catalytic activity for o-xylene oxidation. The meso-CoOx sample with the largest surface Co2+ amount performed the best: The o-xylene conversion at 240 degrees C was 83%, and the reaction rate over meso-CoOx was nine times higher than that over meso-Co3O4. It is found that the samples with more surface Co2+ species possessed better oxygen activation ability, and the Co2+ species were the active sites that favored the formation of highly active O-2(-) and O-2(2-) (especially O-2(-)) species. (C) 2017 Elsevier Inc. All rights reserved.
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