Yakha Vissurkhanova is a scientist working at Institute of Organic Synthesis and Chemistry of Coal of Kazakhstan Republic since 2012. She received a master’s degree of Natural Sciences in 2014. She completed her research work titled «Synthesis and physico-chemical studies of polymer-metal nanocomposites based on polyvinyl alcohol, polyaniline and 3d-metals» at Academician E. A. Buketov Karaganda State University, Kazakhstan. She current research interests are focused on the synthesis of 3d-metal doped polyaniline composites for hydrogenation of organic compounds. She has published more than 10 research papers in various national and interna-tional journals.
Metal-polymer composites on the base of conductive polymer polyaniline (PAni) have a number of practically valuable proper-ties. In particular, they are actively used as catalysts in catalytic reactions and as electrode coatings in electrocatalytic systems.\r\nThis paper presents the research results of the electrocatalytic activity of copper- and iron-containing PAni composites obtained by chemical methods in the processes of electrocatalytic hydro-genation of aromatic nitro-compounds, such as p-nitroaniline (p-NA) and p-nitrobenzoic acid (p-NBA). Copper- and iron-PANI composites were prepared by incorporating copper chloride (II) or iron oxide (FeO) in the reaction medium of oxidative polymeriza-tion of aniline (oxidizer – ammonium peroxydisulfate). The exper-iments on electrocatalytic hydrogenation were carried out in a diaphragm electrochemical cell in an alcohol–aqueous alkali catholyte. The anode was a Pt-gauze, the cathode was a Cu-plate, which closely contacted the bottom of the electrolyzer and served as a substrate for the PAni composite catalyst. The exper-iments were performed at a current of 1.5 A and a temperature of 30°C.\r\nBy X-ray analysis it is determined that in the constitution of PAni+CuCl2 composites synthesized with and without solvent evaporation procedure after applying them to activate the cath-ode in electrohydrogenation of p-NA there are the crystalline phases of Cu0 and copper oxides (Figure 1, a). In the constitution of PAni+FeO composites after hydrogenation of p-NBA there are crystalline phases of Fe0, FeO and Fe3O4 (Figure 1, b). The ap-pearance of copper and iron particles in zero-valence state in the composites indicates the passage of electrochemical reduction of metal cations from their compounds present in these composites before the hydrogenation processes. Exactly these metal parti-cles have a catalytic effect on the electrohydrogenation of p-NA and p-NBA. In the case, the hydrogenation rates and conversion of hydrogenated compounds increase in comparison with their electrochemical reduction on Cu-cathode. The main products of electrocatalytic hydrogenation of p-NA and p-NBA on PAni com-posites are the corresponding aromatic amino compounds