Morphology effects of Co3O4 nanocrystals catalyzing CO oxidation in a dry reactant gas stream

Tuning the Morphology of Metal Oxides for Catalytic Applications

“…Kinetic tests for CO oxidation also indicated that Co 3 O 4 nanoplates exposing the {111} planes exhibited a higher activity and a lower activation energy of 21 kJ/mol, while the Co 3 O 4 nanorods exposing {110} planes had activation energy of 40 kJ/mol. 61 Although these results are somewhat different from previous views, perhaps due to the porous structures with cracks and interspaces in the Co 3 O 4 nanostructures, an obvious morphology-dependent effect in CO oxidation has been obtained.…”

“…[56][57][58][59][60][61][62][63] One prominent feature in these practical applications is that the performance of Co 3 O 4 is closely linked with its morphology. Crystallographically, Co 3 O 4 has a spinel structure (space group of Fd3( )m) with a unit cell length of 0.8084 nm.…”

Synthesis of Co3O4 nanotubes and their catalytic applications in CO oxidation

“…In these applications, the reaction rate was intimately associated with the morphology of the oxide particles. For example, Co 3 O 4 nanorods containing substantial amounts of exposed {110} planes exhibited superior catalytic activity for low-temperature CO oxidation to the spherical particles mainly enclosed by the {111} facets [1].Similarly, Co 3 O 4 nanobelts [2], nanosheets [3], nanowires [4] and nanocubes [5] also showed distinct shape effect in CO oxidation. The activity of Co 3 O 4 for catalyzing CH 4 combustion follows the order: nanosheets N nanobelts N nanocubes [7].…”

“…Tricobalt tetraoxide (Co 3 O 4 ) shows morphology-dependent catalysis in chemical reactions such as CO oxidation [1][2][3][4][5][6], CH 4 combustion [7], hydrodesulfurization of fuels [8] and selective reduction of NO with NH 3 [9]. In these applications, the reaction rate was intimately associated with the morphology of the oxide particles.…”

Facet‐Dependent Activity of Co3O4 Catalyst for C3H8 Combustion

“…[20] Currently, many studies have focused on the catalytic performance of Co 3 O 4 with different morphologies including cubes, [21,22] octahedrons, [21,23] rods, [24,25] needles, [26,27] belts, [28,29] sheets [30,31] and plates. [32,33] The specific morphology possesses the dominantly exposed facets, which have significant impact on catalytic performance of reactions such as water splitting and catalytic combustion. Liu et al [34] reported that the Co 3 O 4 octahedrons enclosed by {111} facets exhibited the excellent activity in water splitting, because the {111} facets possessed the biggest dangling bond density, highest surface energy for the facial adsorption of ionized oxygen species and the smallest absolute value of Gibbs free energy for H adsorption.…”