LIQUID-PHASE HYDROGENATION OF CYCLOPENTADIENE ON MODIFIED SKELETAL NICKEL CATALYSTS

Abstract

This paper presents the results of a study on the hydrogenation of cyclopentadiene on modified skeletal nickel catalysts. It is shown that the activity of multicomponent skeletal nickel catalysts in the hydrogenation of cyclopentadiene is largely due to the nature of the additives introduced into the initial alloy. The introduction of Cu, Pb, Ta, Zn, Mo-Cu, Bi and Mo into the alloy leads to an increase in the activity (W = 14-280 cm3/min g Ni) and selectivity (Ks = 0.93-0.99) of cyclopentadiene hydrogenation, additions of Cr, Ti, Sn and Cr-Cu have no significant effect. As a result, when cyclopentadiene is hydrogenated, an intermediate alkene, cyclopentene, is formed. This is due to the cyclic structure of cyclopentadiene, which causes the formation of identical cycloalkene molecules when hydrogen is added to any position. The saturation of cyclopentadiene is completely completed upon absorption of 1 mole of hydrogen, and cyclopentene can be obtained in high yield. References [1] Sagdyev K.A., Sagdyev A.A. Hydrogenation of unsaturated hydrocarbons on a palladium catalyst // Technological University Bulletin. 2015. Vol. 18, No. 12. P. 32-34 [in Russ.] [2] Vreshagyna N.V., Zaharova G.B., Antonova T.N., Abramov I.G. Liquid-phasehydrogenation of cycloolefins // Chemistry and Chemical technology. 2013. Vol. 56, issue 12. P. 79-82 [in Russ.] [3] Sokolskyi D.V. Hydrogenation in solutions. Alma-Ata: Nauka, 1979. 364 p. [in Russ.] [4] Nikolaev S.A., Zanaveskin L.N., Smirnov V.V., Averyanov V.A., Zanaveskin K.L. Catalytic hydrogenation of alkynes and alkadienes impurities in olefins. Practical and theoretical aspects // Advanes in. 2009. No. 78(3). P. 248-265 [in Russ.] [5] Sokolskyi D.V., Dryuz V.A. Introduction to the theory of heterogeneous catalysis. М.: High school, 1981. 215 p. [in Russ.] [6] Al-Annar A.S., Webb G. Hydrogenation of Acetilene over Supported Metal Catalysts. Part I. Adsorption of [14C] Acetilene and [14C] Ethylene on Silica Supported Rhodium, Iridium and Palladium and Alumins Supported Palladium // Journal of the Chemical Society. Faraday Transactions I. 1978. No. I. P. 195-205 [in Eng.] [7] Synthetic rubber. L.: Chemistry, 1976. 752 p. [in Russ.] [8] Erzhanova M.S., Sokolskiy D.V., Popov N.I., Kondratenko V.I. Adsorption and catalytic properties of skeletal nickel doped with tantalum // Journal of Physical Chemistry. 1977. Issue 2. P. 424-428 [in Russ.] [9] The patent of USA № 4162271,1979. Selective Hydrogenation of Cyclopentadiene to form Cyclopentene using Raney Nickel Catalyst and Alcohols Boiling above 95˚C, in the Reaction Mixture / Lawson G.Wideman [in Eng.]