Effect of polyvinylpyrrolidone on the catalytic properties of Pd/γ-Fe2O3 in phenylacetylene hydrogenation
| Autor: | E. T. Talgatov, A. S. Auyezkhanova, A. K. Zharmagambetova, Farida U. Bukharbayeva, Nurmukhamet Zh. Tumabayev |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Polyvinylpyrrolidone 010405 organic chemistry Scanning electron microscope Nanoparticle chemistry.chemical_element 010402 general chemistry 01 natural sciences Catalysis 0104 chemical sciences Thermogravimetry chemistry.chemical_compound Differential scanning calorimetry chemistry Chemical engineering Phenylacetylene medicine Physical and Theoretical Chemistry Palladium medicine.drug |
| Zdroj: | Reaction Kinetics, Mechanisms and Catalysis. 131:153-166 |
| ISSN: | 1878-5204 1878-5190 |
| DOI: | 10.1007/s11144-020-01857-x |
| Popis: | Maghemite nanoparticles modified with polyvinylpyrrolidone were synthesized using the chemical co-precipitation method. Palladium ions have then been immobilized on the PVP/γ-Fe2O3 magnetic support. The Pd-PVP/γ-Fe2O3 catalyst obtained was characterized using X-ray diffraction, thermogravimetry coupled with differential scanning calorimetry and quadrupole mass spectrometry, scanning electron microscopy combined with energy dispersive X-ray analysis, transmission electron microscopy, nitrogen adsorption–desorption and vibrating sample magnetometry. Morphology, microstructure, particle sizes and textural properties of the Pd-PVP/γ-Fe2O3 were compared with those of the unmodified Pd/γ-Fe2O3 catalyst, synthesized using the same method. The polymer has affected the size of γ-Fe2O3 nanoparticles and their agglomeration, forming compact microstructure with decreased mesopores (4.5 nm). Palladium nanoparticles with size of 3–5 nm were found both on the surface of the PVP/γ-Fe2O3 particles (6–10 nm) and inside the pores formed by them. The Pd-PVP/γ-Fe2O3 has demonstrated improved catalytic properties in phenylacetylene hydrogenation under mild conditions of 40 °C and 0.1 MPa, compared to Pd/γ-Fe2O3 and similar catalysts prepared using polyethylene glycol and pectin. The hydrogenation rate of C–C triple bond on Pd-PVP/γ-Fe2O3 achieved 2.8 × 10–6 mol s−1 and selectivity to styrene was 92%. The catalyst showed weak ferromagnetic and soft magnetic properties (MS = 51 emu g−1, Mr = 5.4 emu g−1, and HC = 71 Oe) and, therefore, can be easily recovered with an external magnet and reused for at least 11 runs without significant degradation in the catalytic activity. |
| Databáze: | OpenAIRE |
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