Effect of Calcination Conditions on Co3O4 Catalysts in the Total Oxidation of Toluene and Propane

Abstract

Co3O4 catalysts were prepared via carbonate precipitation and subsequent calcination under specific conditions. The different catalysts were characterized as received using several techniques and tested in the total oxidation of toluene or propane. Calcination at low temperature or under dynamic conditions resulted in Co3O4 catalysts with small crystallite sizes and large surface areas. The performances of the Co3O4 catalysts appeared to be closely related to the low-temperature reducibility. The best catalyst, Co-350D, showed a toluene oxidation rate of 44.5 nmol g−1 s−1 at 200 °C and a propane oxidation rate of 54.0 nmol g−1 s−1 at 150 °C. Meanwhile, Co-350D exhibited excellent cycling stability and decent long-term durability in both reactions.

Thermally Regulated and Heterointerface-Engineered 3D-Hierarchical Co3O4/IrO2 Hybrid Nanostructure for Multifunctional Electrocatalysis

“…From this point of view, it becomes evident that sharp and higher peak intensity in IC-700 signifies a larger crystalline size with minimal dislocation defects and reduced strain. 27 Whereas, IC-550 with a smaller crystalline size may possess more oxygen vacancies, point defects, or dislocation defects. 28 The formation of defectrich Co 3 O 4 in IC-550 can induce slight variations in distortion and electronic redistribution compared to more crystalline IC-700.…”

“…Although IC-550 and IC-700 show almost identical XRD patterns, there is a considerable difference in peak intensities. From this point of view, it becomes evident that sharp and higher peak intensity in IC-700 signifies a larger crystalline size with minimal dislocation defects and reduced strain . Whereas, IC-550 with a smaller crystalline size may possess more oxygen vacancies, point defects, or dislocation defects .…”

Highly Stable Photocatalytic Dry and Bi-Reforming of Methane with the Role of a Hole Scavenger for Syngas Production over a Defective Co-Doped g-C3N4 Nanotexture

“…Cobalt (Co) is currently seen to be particularly promising due to numerous important properties like loosely bounded d-electrons, active sites, and effective electron trapping [24,25]. In addition to that, cobalt oxide has a narrow band gap, high surface area, exhibits strong light absorption, and has excellent electrical conductivity [26,27]. More carbon atoms can be attached to the active sites of the photocatalyst, increasing its stability and preventing the production of coke [28].…”