Interfacial effects in CuO/Co₃O₄ heterostructures enhance benzene catalytic oxidation performance

Abstract

To elucidate the impact of interfacial effects, CuO/Co3O4 catalysts with nanosheet-like heterostructures were synthesized via a facile approach (i.e. precursor calcination) and utilized for benzene catalytic oxidation. The results indicated...

Ultrathin LayCoOx Nanosheets with High Porosity Featuring Boosted Catalytic Oxidation of Benzene: Mechanism Elucidation via an Experiment–Theory Combined Paradigm

“…The optimized structure of Co 3 O 4 (311) is presented in Figure a, demonstrating a high degree of consistency with structures reported in previous literature. , On the surface layer, there exist four distinct coordination environments for the Co atoms in Co 3 O 4 (311), denoted as La-doped Co 3 O 4 (1–4). Additionally, one coordination environment is present in the sublayer, termed La-doped Co 3 O 4 (5).…”

“…The optimized structure of Co 3 O 4 (311) is presented in Figure 5a, demonstrating a high degree of consistency with structures reported in previous literature. 44,59 On the surface layer, there exist four distinct coordination environments for the Co atoms in In this case, a negative E f value indicates an exothermic doping process, while a positive E f value signifies an endothermic process. After successful doping, the stability of the La-doped Co 3 O 4 configurations was assessed using the segregation energy (E seg ).…”

“…43 Furthermore, to correct the selfinteraction error of the 3d electrons of Co and the 5d electrons of La, the rotationally invariant formulation of GGA + U was employed with effective U values (U eff (Co) = 3.5 eV and U eff (La) = 8.5 eV). 44 catalysts, designed with multiple anticipated physiochemical properties for catalytic benzene oxidation, is illustrated in Figure 1a. A systematic material characterization was subsequently conducted to confirm these properties.…”

In Situ Construction of Manganese Oxide Photothermocatalysts for the Deep Removal of Toluene by Highly Utilizing Sunlight Energy

“…Besides, the reaction products during the oxidation process were collected, separated, and then identified by GC−MS, as displayed in Figure 5c,d. The products detected in both photothermocatalytic and thermocatalytic processes include acetone (1), benzyl alcohol (2), benzene (3), acetic acid (4), toluene (5), benzaldehyde (6), and benzoic acid (7). Significantly, phenylmaleic anhydride (8) and benzyl benzoate (9) were, respectively, collected from the exhaust gas of the thermocatalytic reaction at 246 °C and the photothermocatalytic reaction at 233 °C, originating from the polycondensation and esterification reaction.…”

“…Moreover, VOCs are major precursors leading to ozone and secondary organic aerosols in the atmosphere. − Human yearning for good living space has driven the development of air pollution elimination technology. For VOCs with low concentration and flow rate, photocatalysis and catalytic oxidation are effective degradation methods. − However, for the degradation of aromatic compounds, such as toluene, they still suffer from low quantum efficiency and high energy consumption, respectively, which make it essential to find a good way that integrates multiple advantages to handle pollutants . Photothermocatalysis makes use of infrared heating and the nonradiative thermal effect generated by the photon coupling to provide power for the catalytic reaction.…”