Composites Based on Nanodispersed Nickel, Graphene-Like Carbon, and Aerosil for Catalytic Hydrogenation of Furfural and
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COMPOSITES BASED ON NANODISPERSED NICKEL, GRAPHENE-LIKE CARBON, AND AEROSIL FOR CATALYTIC HYDROGENATION OF FURFURAL AND QUINOLINE V. M. Asaula,1 O. V. Shvets,1 O. O. Pariiska,1 V. V. Bur’yanov,2 S. V. Ryabukhin,2,3 D. M. Volochnyuk,2,3,4 and S. V. Kolotilov1
UDC 544.1, 542.97, 547.721, 547.831
It is shown that a composite containing nickel nanoparticles and carboneous multi-layer graphene-like particles on aerosil, prepared by pyrolysis of deposited nickel complex with melamine, catalyzes hydrogenation of furfural to furfuryl alcohol as well as hydrogenation of quinoline to 1,2,3,4-tetrahydroquinoline. The highest yield of hydrogenation products (27% of furfuryl alcohol at 100°C, 30 atm H2, and 25% of quinoline at 100°C, 100 atm H2) is achieved with the use of composites with higher nickel content (8.4%) and higher size of defect-free graphene areas (ratio of band intensities ID/IG in Raman spectrum 0.9).
Keywords: composites, nickel, graphene-like carbon, hydrogenation, furfural, quinoline.
Hydrogenation of heterocyclic compounds is widely used in obtaining active agents for pharmaceuticals, in agrochemistry [1], as well as in large-scale organic synthesis of components of varnishes, paints, and solvents [2]. Currently, such hydrogenation processes are mainly carried out using platinum-based metal catalysts [3], while nickel-based analogues are being actively developed [4-7]. The advantages of nickel-containing catalysts include lower toxicity and cost. On the other hand, such systems are inferior to platinum-based catalysts in terms of conversion values of mother substances and in many cases in terms of process selectivity. The catalytic effect of nanosized nickel in the processes of unsaturated organic compound hydrogenation can be increased upon the formation of composites with carbon materials, which may be related to the synergetic effect of metal particles and carbon components [8-10]. It should be noted that carbon materials themselves can show a catalytic effect in hydrogenation processes [11, 12]. An important task of modern physical chemistry is to determine the factors influencing the catalytic effect of nickel composites and carbon materials in the processes of unsaturated organic compound hydrogenation. This task fulfillment is of great importance for the development of new catalysts for valuable organic substances. ________ 1 L. V. Pysarzhevsky Institute of Physical Chemistry, NAS of Ukraine, Kyiv, Ukraine. E-mail: [email protected]. 2 LLC Research and Production Enterprise “Enamine,” Kyiv, Ukraine. 3 Institute of High Technologies, Taras Shevchenko National University, Kyiv, Ukraine. 4 Institute of Organic Chemistry, NAS of Ukraine, Kyiv, Ukraine. ___________________________________________________________________________________________________ Translated from Teoretychna ta Eksperymentalna Khimiya, Vol. 56, No. 4. pp. 245-251, 2020. Original article submitted May 25, 2020; revision submitted July 2, 2020.
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