Zirconia‐Supported Cobalt Catalysts: Activity and Selectivity in NO Reduction by CO

Abstract

Cobalt catalysts supported on tetragonal and monoclinic zirconia were prepared using a one‐pot procedure through the incorporation of a Co3O4 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 Co3O4 and Co2+ species as oxo‐ions which displayed the best catalytic performance among the studied catalysts, with the highest NO conversion (75%) and high selectivity to N2 (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.

The low-temperature simultaneous detoxification of NO and CO over precious metal-free nanocomposite metal oxides

“…Therefore, non-PGM catalysts have achieved a high demand by researchers worldwide. [5][6][7][8] Transition metal oxides are widely studied materials in many industry-related catalytic processes. These catalysts have properties that allow them to replace presently employed highcost catalytic materials.…”

Pore Structure of TiO₂- Modified ZrO₂ Particles Prepared by the Glycothermal Method

“…As zirconia and zirconia-based solid solutions have high melting points and superior wear resistance, they have been used for various applications such as refractory materials and wear-resistant parts [1,2]. Zirconia-based materials have been also used as catalysts and catalyst supports for various reactions, such as isomerization of n-butane [3] or n-hexane [4], NO reduction by CO [5], and decomposition of methane [6,7]. For these catalytic applications, catalyst materials having improved specific surface area and thermal stability are sought.…”