Selective corrosion of LaCoO₃ by NaOH: structural evolution and enhanced activity for benzene oxidation

Abstract

NaOH corrosion of electrospun LaCoO3 shows enhanced benzene oxidation activity due to mutual effects among La2O3, Co3O4 and LaCoO3.

Role of Mineral Nutrients in Plant-Mediated Synthesis of Three-Dimensional Porous LaCoO3

“…48-0123). 33 Similar to previous studies, several excess diffraction peaks matched with Co 3 O 4 and La 2 O 3 (2θ = 24− 32°) are observed for chem-500 (sample 3), which demonstrated the difficulty to obtain pure LaCoO 3 phase at a lower temperature through the conventional method. 28,34 When the calcination temperature is raised to 700 °C (chem-700, sample 4), a pure perovskite phase of LaCoO 3 can be obtained.…”

“…The nitrogen adsorption-desorption isotherms (Figure 5) show the hysteresis loops at P/P0 = 0.8-0.9 corresponding to the gaps piled up by nanoparticles. 31,40 . The textural properties are shown in Table 3.…”

Inverse Coprecipitation Directed Porous Core–Shell Mn–Co–O Catalyst for Efficient Low Temperature Propane Oxidation

“…It is reported that the more exposed surface Co 3+ in Co-based catalyst will be conducive to the enhancement of oxidation performance. 41,42 As listed in Table 3, the Co 3+ /Co 2+ molar ratio increases in the sequences Co 1 Mn 2 O δ < Co 1.5 Mn 1.5 O δ < Co 2 Mn 1 O δ . The order is opposite to that of Mn 4+ /Mn molar ratio, which may be caused by the electron transfer from Co to Mn atoms.…”

Coral-like CoMnOx as a Highly Active Catalyst for Benzene Catalytic Oxidation

“…Co 2p XPS spectra (Figure b) are divided into Co 2p 3/2 and Co 2p 1/2 . The binding energies at 780.1 and 781.4 eV are assigned to Co 3+ and Co 2+ , respectively, while the peaks situated at 784.4, 789.8, and 804.2 eV belong to satellite peaks. The surface Co 3+ /Co 2+ can be calculated from its corresponding XPS integral areas, and the results are tabulated in Table S1.…”