Experimental and theoretical investigation of the tuning of electronic structure in SnO₂viaCo doping for enhanced styrene epoxidation catalysis

Abstract

Exploiting new heterogeneous catalysts composed of earth-abundant elements for various organic transformations under moderate reaction conditions is of vital importance in modern synthetic chemistry. Herein, we report an effective strategy...

Iodide ions as invisible chemical scissors tailoring carbon nitride for highly efficient photocatalytic H2O2 evolution

“…7c). 50 As for the specific surface area, TCN/NaI 0.4 has 13.33 m 2 g −1 , which is larger than that of BCN (7.25 m 2 g −1 ). Additionally, the O 2 adsorption capacity of the as-prepared samples was evaluated by temperature-programmed desorption (O 2 -TPD).…”

Expediting Ethylbenzene Oxidation via a Bimetallic Cobalt–Manganese Spinel Structure with a Modulated Electronic Environment

“…For Co 3 O 4 , the two fitted peaks at 779.9 and 795.1 eV are assigned to 2p3/ 2 and 2p1/2 of Co 3+ and the other two peaks at 781.8 and 796.9 eV are attributed to 2p3/2 and 2p1/2 of Co 2+ , respectively. 29,30 The corresponding peaks in the CMO are located at 780.4, 795.7, 782.1, and 797.4 eV, respectively. Hence, in comparison with those of Co 3 O 4 , the Co 2p spectra of the CMO shift to the higher binding energy direction, suggesting the decreased density of surrounding electrons of Co ions and the strong electronic interaction between Co and Mn due to the incorporation of heteroatom Mn into the spinel-structured Co 3 O 4 .…”

Manipulation of Electronic Effect and Assembly Architecture to Invoke Oxidation of Ethylbenzene by Hierarchical Co3O4 Wreaths

“…Figure d displays the Raman spectra of the samples, with the peaks at 484, 522, 622, and 693 cm –1 corresponding to the E g , F 2g (2) , F 2g (3) , and A 1g vibration modes of the spinel structure of pure Co 3 O 4 , respectively . Compared with that of the CCP, the broadening of the peaks accompanied by decreased peak intensity of the CCW suggests its smaller crystallite size . Moreover, the peak positions in the CCW are shifted to lower wave numbers relative to that in the CCP, indicating the increase of Co species at lower oxidation states and the presence of more Ov. , In addition, the Co–O force constant ( k ) of the CCW and CCP can be calculated as the following: v = 1 2 π c k μ where ν is the wavenumber (cm –1 ), c is the velocity of light, and μ is the effective mass of the bonds .…”