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Zirconia‐Supported Cobalt Catalysts: Activity and Selectivity in NO Reduction by CO
Author(s) -
Lima Thiago M.,
Pereira Cristiane A.,
Castelblanco William N.,
Santos Camila M. B.,
da Silva Sebastião W.,
Santana Ricardo C.,
UrquietaGonzález Ernesto A.,
Sartoratto Patrícia P. C.
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201702475
Subject(s) - cubic zirconia , cobalt , catalysis , monoclinic crystal system , tetragonal crystal system , selectivity , materials science , dispersion (optics) , chemical engineering , phase (matter) , inorganic chemistry , agglomerate , nox , chemistry , crystal structure , organic chemistry , metallurgy , composite material , ceramic , physics , engineering , optics , combustion
Cobalt catalysts supported on tetragonal and monoclinic zirconia were prepared using a one‐pot procedure through the incorporation of a Co 3 O 4 colloidal suspension during the support synthesis and evaluated in the reaction of NO reduction by CO. A better dispersion of the active phase was obtained by this method when compared to the conventional impregnation one. Furthermore, the crystalline phase of zirconia in the supports had a crucial effect in the dispersion of the cobalt species, being that the pure tetragonal phase led to a higher dispersion of the active phase. The one‐pot prepared tetragonal zirconia led to cobalt active species that consisted in well‐dispersed small agglomerates of Co 3 O 4 and Co 2+ species as oxo‐ions which displayed the best catalytic performance among the studied catalysts, with the highest NO conversion (75%) and high selectivity to N 2 (85%) at 300 °C. These results show that the one‐pot methodology employed in this work has a strong potential to produce suitable catalysts for the abatement of NOx emissions.