Liquid-phase hydrogenation of 1-hexene and phenylacetylene over multicomponent nickel skeleton catalysts

al-Farabi Kazakh National University Non-profitjoint-stock company, Research Institute of New Chemical Technologies and Materials, Almaty, Republic of Kazakhstan

^* E-mail address: saltanat_suimbayeva@mail.ru

Abstract

This paper presents the results of a study of the process of hydrogenation of 1-hexene in ethanol and phenylacetylene in a hexanewater suspension over multicomponent nickel skeleton catalysts It was demonstrated that the activity of multicomponent skeleton nickel catalysts is substantially dependent on the nature of the additives introduced into the bearing alloy. Introduction of Cu, Pb and Ta leads to an increase in activity (W=196-295cm³/min-gNi). The major mechanism of the effect of emulsion composition on the rate and selectivity of hydrogenation of phenylacetylene involves a change in the coefficient of distribution of substances between the solution and the surface of the skeleton nickel catalyst. It was also shown that the presence of water, which competes with unsaturated hydrocarbons during adsorption, adversely affects the process of purification from acetylenic hydrocarbons, as well as the stereo-regular polymerization of monomer. The research results of the kinetics and direction of the processes of hydrogenation of phenylacetylene suggest significant effect of the adsorption factor, including the ratio of free energies, concentrations and spatial orientation of the molecules of the mixture components, as well as the interaction of reacting substances and hydrogen with thecatalyst surface.