• liquid phase selective hydrogenation of cinnamaldehyde over copper supported catalysts

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
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     the selective hydrogenation of cinnamaldehyde is carried out in a batch reactor, at 100 °c and 1 mpa of h2using isopropyl alcohol as the solvent, over a series of copper supported catalysts: cu/al2o3, cu/sio2cu/mcm-48, cu/ceo2 and cu/α-fe2o3. the selectivity of the samples is compared with that corresponding to pti/sio2. reduced cu/al2o3 and cu/sio2 showed lower selectivity to the cinnamyl alcohol (16–22%) than pt/sio2 (35%), at 15% of conversion. following a calcination at 300 °c both, activity and selectivity of copper catalysts were increased. the calcined surface would hydrogenate cdouble bond; length as m-dasho bond by hydrogen transfer from the solvent. tpr, xrd and ftir of adsorbed co showed that cu (i) species are stabilized on the mesoporous structure of mcm-48. this particular feature renders cu/mcm-48 a selective catalyst, reaching high selectivity values (51%, at 15% of conversion). cu/ceo2 and cu/α-fe2o3 showed higher selectivity than pt based catalyst due to a promotion of the catalytic properties of copper by reduced support species.

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