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Supported Metal Nanoparticles on Activated Carbon for α,β-unsaturated Aldehyde Hydrogenation

[ Vol. 16 , Issue. 23 ]

Author(s):

Cecilia R. Lederhos, Juan M. Badano, Monica E. Quiroga, Alfonso E. Ramirez, Jose J. Martinez and Hugo A. Rojas   Pages 2782 - 2790 ( 9 )

Abstract:


Palladium and platinum nanoparticles on an activated carbon were used as catalysts in the citral hydrogenation reaction in liquid phase at 363 K and 620 kPa of hydrogen pressure. The effect of metallic precursor salt to prepare mono and bimetallic catalysts was evaluated using PdCl2, Pd(NO3)2 and H2PtCl6. X-ray Photoelectron Spectroscopy suggests that Pdº, Pdδ+ (with δ close to 0) and Ptº are present on the monometallic catalysts surface; while Pdδ+, Pdn+, Ptδ-and Ptδ+ (with δ ≅ 0 and n ≅ 2) are detected on the bimetallic Pd-Pt/C. Monometallic PtCl/C displayed a very low total conversion of citral. All Pd based catalysts (PdN/C, PdCl/C and Pd-Pt/C) were highly selective to citronellal and isopulegol (desired products). The bimetallic Pd-Pt/C was the most active and selective catalyst. Electrondeficient and electron-rich species, chlorine amount on carbon surface and the modification of surface groups produced during the catalysts synthesis played an important role on the selectivity values to obtained products.

Keywords:

Activated carbon, Citral, Hydrogenation, Nanoparticles, Palladium, Platinum.

Affiliation:

Instituto de Investigaciones en Catalisis y Petroquimica (FIQ, UNL-CONICET), Santa Fe, Argentina.



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