Influence of cobalt species on the catalytic performance of Co N C/SiO2 for ethylbenzene oxidation.
In this paper, cobaltporphyrin is used as a precursor to synthesize carbon nitrides with metal active sites supported on silica spheres by heat treatment (i.e. M N C/SiO2) The catalytic performance of M N C/SiO2 for ethylbenzene oxidation has been investigated and techniques such as N2 adsorption/desorption isotherm, NH3 TPD, HRTEM, STEM mapping and X ray photoelectron spectroscopy (XPS) are employed to explore the active sites for ethylbenzene oxidation. XPS results show that cobalt compounds, such as CoOx and metallic Co, as well as cobalt nitrides, such as Co Nx, are formed after the pyrolysis of cobaltporphyrin. However, according to the NH3 TPD experiment, Co Nx may be the primary active site. When Co Nx is poisoned by KSCN, the significant loss of catalytic activity further proves and verifies that Co Nx instead of CoOx is the primary active site of M N C/SiO2 for ethylbenzene oxidation.
Physical chemistry chemical physics PCCP