Selective Hydrogenation of Phenylacetylene-Isoprene Mixtures on Multicomponent Skeletal Nickel Catalysts
Dzheldybaeva I.M. Esenalieva M.Z. Kairbekov Z.K. Suimbaeva S.M.
September 2025Engineered Science Publisher
ES Materials and Manufacturing
2025#29
This study investigates the selective hydrogenation of phenylacetylene–isoprene mixtures using multicomponent skeletal nickel (Ni) catalysts, with a focus on the influence of alloy composition on catalytic performance. X-ray diffraction analysis revealed that Ni-Al-Zn, Ni-Al-Mo-Cr, and Ni-Al-Ti-Mo alloys predominantly consist of finely dispersed nickel phases, whereas Ni-Cr-Cu and Ni-Ti-Cu systems additionally form the Ni₂Al₃ intermetallic phase. The specific surface area and hydrogen adsorption capacity of the catalysts were strongly dependent on modifying additives: Mn, Mo-Cr, Ti-Mo, and Cr-Cu enhanced these properties (115–146 m²/g Ni and 69–105 cm³/g Ni, respectively), whereas Zn and Pb additives led to reduced performance. Catalytic testing demonstrated preferential hydrogenation of phenylacetylene over isoprene, driven by differences in adsorption affinity. The hydrogenation activity varied significantly with additive composition—Zn, Cu, Pb, Mo-Cu, Ta, Bi, and Ag increased reaction rates (W = 153–286 cm³/min·g Ni), while Mn, Fe, and Ti-Cu suppressed activity (W = 56– 75 cm³/min·g Ni). The results of studies of hydrogenation of binary mixtures of phenylacetylene-isoprene indicate the advantage of phenylacetylene in selective hydrogenation on multicomponent skeletal nickel catalysts, primarily due to the significant difference in adsorption coefficients (Vf/Vi=31-130).
Catalytic activity , Hydrogen adsorption , Hydrogenation , Isoprene , Phenylacetylene , Selectivity , Skeletal nickel catalysts
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Al-Farabi Kazakh National University, Research Institute of New Chemical Technologies and Materials, Al-Farabi str 71, Almaty, 050000, Kazakhstan
Al-Farabi Kazakh National University
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