Synthesis of polymer protected Pd–Ag/ZnO catalysts for phenylacetylene hydrogenation

Zharmagambetova A. Auyezkhanova A. Talgatov E. Jumekeyeva A. Buharbayeva F. Akhmetova S. Myltykbayeva Z. Nieto J.M.L.
December 2022 Springer Science and Business Media B.V.

Journal of Nanoparticle Research
2022 #24 Issue 12

A simple and environmentally friendly method, based on sequential adsorption of polyacrylamide (PAM) and transition metal ions (Pd²⁺, Ag⁺) on zinc oxide precipitated from water solution, was used to synthesize supported mono- and bimetallic catalysts with various Pd:Ag ratios. The catalyst characterization results indicated that PAM and metal ions are completely adsorbed by zinc oxide, forming polymer-stabilized Pd and Ag nanoparticles of 1–3 nm in size, evenly distributed on the support surface. The catalysts were studied in the hydrogenation of phenylacetylene under mild conditions (0.1 MPa, 40 °C). Although Ag-free 1%Pd-PAM/ZnO catalyst presents an interesting catalytic performance (in terms of activity, selectivity, and stability), among PAM-modified catalysts the optimal was 1%Pd–Ag(3:1)-PAM/ZnO, presenting a selectivity to styrene of 88% at 91% conversion of phenylacetylene. For comparison, similar Pd–Ag (3:1) bimetallic catalysts modified with polysaccharides, such as pectin (Pec), chitosan (Chit), and 2-hydroxyethylcellulose (HEC), were studied in the hydrogenation process. The catalysts demonstrated nearly the same selectivity to styrene. The activity of the catalysts decreases in the following order: 1%Pd–Ag(3:1)-HEC/ZnO > 1%Pd–Ag(3:1)-PAM/ZnO > 1%Pd–Ag(3:1)-Pec/ZnO > 1%Pd–Ag(3:1)-Chit/ZnO.

Environmentally friendly , Hydrogenation , Nanocomposites , Palladium catalysts , Palladium-silver catalysts , Phenylacetylene , Polyacrylamide , Polysaccharides

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D.V. Sokolskiy Institute of Fuel, Catalysis and Electrochemistry, Almaty, Kazakhstan
Abai Kazakh National Pedagogical University, Almaty, Kazakhstan
Al-Farabi Kazakh National University, Almaty, Kazakhstan
Instituto de Tecnología Química, Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Avenida de los Naranjos S/N, Valencia, 46022, Spain

D.V. Sokolskiy Institute of Fuel
Abai Kazakh National Pedagogical University
Al-Farabi Kazakh National University
Instituto de Tecnología Química

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