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Erschienen in: Journal of Nanoparticle Research 12/2022

01.12.2022 | Research paper

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

verfasst von: Alima Zharmagambetova, Assemgul Auyezkhanova, Eldar Talgatov, Aigul Jumekeyeva, Farida Buharbayeva, Sandugash Akhmetova, Zhannur Myltykbayeva, Jose M. Lopez Nieto

Erschienen in: Journal of Nanoparticle Research | Ausgabe 12/2022

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Abstract

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.

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Metadaten
Titel
Synthesis of polymer protected Pd–Ag/ZnO catalysts for phenylacetylene hydrogenation
verfasst von
Alima Zharmagambetova
Assemgul Auyezkhanova
Eldar Talgatov
Aigul Jumekeyeva
Farida Buharbayeva
Sandugash Akhmetova
Zhannur Myltykbayeva
Jose M. Lopez Nieto
Publikationsdatum
01.12.2022
Verlag
Springer Netherlands
Erschienen in
Journal of Nanoparticle Research / Ausgabe 12/2022
Print ISSN: 1388-0764
Elektronische ISSN: 1572-896X
DOI
https://doi.org/10.1007/s11051-022-05621-1

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