Reactions of catalytic hydrogenation are widely used in modern organic chemistry and industry for synthesis of active pharmaceutical ingredients, effective substances for plant protection etc. These processes are usually performed with catalysts based on platinum, palladium and other precious metals. Development of noble-metal-free materials, possessing high catalytic activity in the process of organic compounds hydrogenation, is actual task. The aim of this work was to study the influence of the composition and structure of composites of graphene-like carbon and nanosized 3d-metals or their oxides deposited on the different carriers on their catalytic activity in quinoline hydrogenation. The nanocomposites of were prepared by pyrolysis Co(II), Ni(II), Zn(II) complexes with N-containing organic ligands (phenantroline, melamine, o-phenylenediamine) on aerosil (highly disperse SiO2), ZrO2, Al2O3, activated carbon. It was shown by transmission electronic microscopy that the nanocomposites contained carbon species with size of separate particles ca. 10-50 nm. Analysis of the Raman spectral data (Fig. 1) allowed to conclude that the graphene-like particles had more than 8 carbon monolayers. The size of carboneous particles, separated from the carrier, was in range from 80 to 120 nm according to the results of dynamic lights scattering in suspension. Fig. 1 The obtained nanocomposites were catalytically active in hydrogenation of quinoline to 1,2,3,4-tetrahydroquinoline by H2 (Fig. 2). Under 5 MPa pressure and 150C temperature the yield of tetrahydroquinoline varied from 40 to almost 100% depending on the composite. Catalytic activity essentially depended on synthetic conditions (mainly pyrolysis rate) and the nature of the carriers. The Co-containing composites deposited on aerosil or ZrO2 were the most active. Catalytic activity essentially increased at decreasing pyrolysis rate, as well as at increase of Co content. Fig. 2

Catalytic hydrogenation of quinoline on composites of graphene-like carbon and 3D-metals or their oxides

2019 Spring National Meeting

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