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  • effect of support on activity of palladium catalysts in nitrobenzene hydrogenation

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 1202
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    • شماره تماس دبیرخانه رویداد: -
     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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