Abstract
The effect of two types of catalysts on the activity of the catalytic hydrogenation of nitrobenzene was studied. Catalysts were prepared by the surface deposition of palladium hydroxide with a simultaneous reduction with formaldehyde in a basic environment and were characterised by X-ray powder diffraction, transmission electron microscopy, adsorption-desorption, and catalytic tests — hydrogenation of nitrobenzene in methanol. The influence of the supports’ (activated carbon and a mixture of activated carbon and multi-walled carbon nanotubes) surface area is discussed. Despite having a size comparable (4–5 nm) to crystallites of metallic palladium, the catalyst prepared on a mixture of activated carbon and nanotubes (Pd/C/CNT) was significantly less active than the catalyst prepared on pure activated carbon (Pd/C); the rate of this reaction was approximately 30 % lower than the initial reaction rate. This feature could be attributed to the lower specific surface area of the Pd/C/CNT (531 m2 g−1) in comparison with the Pd/C (692 m2 g−1).
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Pikna, Ľ., Heželová, M., Demčáková, S. et al. Effect of support on activity of palladium catalysts in nitrobenzene hydrogenation. Chem. Pap. 68, 591–598 (2014). https://doi.org/10.2478/s11696-013-0497-3
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DOI: https://doi.org/10.2478/s11696-013-0497-3