The Effect of Polymer Matrix on the Catalytic Properties of Supported Palladium Catalysts in the Hydrogenation of Alkynols

Talgatov E. Auyezkhanova A. Zharmagambetova A. Tastanova L. Bukharbayeva F. Jumekeyeva A. Aubakirov T.
April 2023 MDPI

Catalysts
2023 #13 Issue 4

Palladium catalysts were obtained by the adsorption method involving the sequential deposition of polyvinylpyrrolidone (PVP) and then palladium ions on a modified zinc oxide surface without high-temperature calcination and reduction stages. The immobilized PVP-palladium catalysts were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET), infrared spectroscopy (IRS), X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and elemental analysis methods. It was found that the introduction of polymer into the catalyst’s composition promotes the dispersion and uniform distribution of active phase nanoparticles (PdO, Pd⁰) on the surface of zinc oxide. The catalysts were tested in the hydrogenation of complex acetylene alcohol, 3,7,11-trimethyldodecyn-1-ol-3 (C₁₅-yn) under mild conditions (0.1 MPa, 40 °C). For comparison, studies on stereoselective hydrogenation of the short-chain alcohol 2-hexynol-1 were performed. It was shown that modification of the catalyst with polymer improves its catalytic properties. High C₁₅-alkenol selectivity (98%), activity (W = 70 × 10⁻⁶ mol/s), and stability (turnover number (TON) 62,000) were achieved on a Pd-PVP/ZnO catalyst. Varying the active phase made it possible to reduce the metal content without deteriorating the catalytic performance of the catalyst.

2-hexynol-1 , 3,7,11-trimethyldodecyn-1-ol-3 , catalytic hydrogenation , polymer-modified catalysts , polyvinylpyrrolidone , supported palladium catalysts

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D.V. Sokolskiy Institute of Fuel, Catalysis, and Electrochemistry, Laboratory of Organic Catalysis, Kunaev str. 142, Almaty, 050010, Kazakhstan
Department of Chemistry and Chemical Technology, K. Zhubanov Aktobe Regional University, A. Moldagulova Avenue 34, Aktobe, 030000, Kazakhstan
Institute of Natural Sciences and Geography, Abai Kazakh National Pedagogical University, Kasybek bi str. 30, Almaty, 050026, Kazakhstan
Higher School of Natural Science, Pavlodar Pedagogical University, Mir Street 60, Pavlodar, 140000, Kazakhstan

D.V. Sokolskiy Institute of Fuel
Department of Chemistry and Chemical Technology
Institute of Natural Sciences and Geography
Higher School of Natural Science

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