The study of the structural characteristics and catalytic activity of Co/CoCo2O4 nanowires

The aim of this work is to study the prospects of using Co/CoCo2O4 nanowires as catalysts for the reduction reactions of para-nitroaniline to para-phenyldiamine, as well as CO conversion. Interest in these structures is due to their physicochemical properties, spinel structure, leading to an increase in catalytic activity, high stability to external influences and degradation over a long period of operation, etc. The initial nanowires were obtained by electrochemical deposition using polymer template matrices. In turn, the method of electrochemical synthesis makes it possible to control with high accuracy not only the geometry of nanostructures, with the possibility of producing nanostructures with a large aspect ratio of 1:100-1:1000, but also to scale this technology for producing nanostructures on a semi-industrial scale. The use of thermal annealing to initiate phase transformations contributes to the complete rearrangement of the nanowire structure along its entire length, with the formation of a stable phase of the CoCo2O4 spinel type. During the study of the catalytic activity of Co/CoCoCo2O4 nanowires it was found that the use of oxide nanowires makes it possible to carry out catalytic PNA-PPD reduction reactions, while the initial nanostructures do not exhibit catalytic activity for these compounds. As a result of the study of the catalytic activity of CO gas oxidation, it was found that the presence of Co3+ cations in the structure of oxide nanowires leads to intensification of CO adsorption processes with the formation of intermediate CO2* compounds and an increase in the rate of CO conversion.