Abstract
Hydrogenation of phenol in aqueous solutions on Pt-Ni/SiO2, Pt-Ni-Cr/Al2O3, Pt/C, and Ru/C catalysts was studied at temperatures of 150–250 °C and pressures of 40–80 bar. The possibility of hydrogenation of hydrolysis lignin in an aqueous medium in the presence of a Ru/C catalyst is shown. The conversion of hydrolysis lignin and water-soluble sodium lignosulfonate occurs with the formation of a complex mixture of monomeric products: a number of phenols, products of their catalytic hydrogenation (cyclohexanol and cyclohexanone), and hydrogenolysis products (cyclic and aliphatic C2–C7 hydrocarbons).
Highlights
Biomass is considered as an alternative to fossil raw materials, both for the production of motor fuel components and for the synthesis of a wide range of valuable chemical compounds [1]
The conversion of hydrolysis lignin and water-soluble sodium lignosulfonate occurs with the formation of a complex mixture of monomeric products: a number of phenols, products of their catalytic hydrogenation, and hydrogenolysis products
Promotion of the PtNi catalyst with chromium does not lead to any significant changes in the total conversion of phenol
Summary
Biomass is considered as an alternative to fossil raw materials, both for the production of motor fuel components and for the synthesis of a wide range of valuable chemical compounds [1]. In addition to combustible gas products, a complex viscous mixture contains a large amount of phenolic compounds and water. Hydrogenolysis is performed on aluminum oxidesupported Ni-Mo and Co-Mo sulfides [2,3,4,5,6,7] or bifunctional catalysts [8,9]. The latter catalytic systems combine two active catalytic functions: supported metal catalysts (noble metals or Ni) and acids (CH3COOH, H3PO4) or Brønsted solid acids (Nafion). The aim of this work is the heterogeneous catalytic hydrogenation of phenol and aqueous solutions of lignin-containing substrates on metal-supported catalysts
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