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.
Current Organic Chemistry
Title:Supported Metal Nanoparticles on Activated Carbon for α,β-unsaturated Aldehyde Hydrogenation
Volume: 16 Issue: 23
Author(s): Cecilia R. Lederhos, Juan M. Badano, Monica E. Quiroga, Alfonso E. Ramirez, Jose J. Martinez and Hugo A. Rojas
Affiliation:
Keywords: Activated carbon, Citral, Hydrogenation, Nanoparticles, Palladium, Platinum.
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.
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Cite this article as:
Lederhos R. Cecilia, Badano M. Juan, Quiroga E. Monica, Ramirez E. Alfonso, Martinez J. Jose and Rojas A. Hugo, Supported Metal Nanoparticles on Activated Carbon for α,β-unsaturated Aldehyde Hydrogenation, Current Organic Chemistry 2012; 16 (23) . https://dx.doi.org/10.2174/138527212804546831
DOI https://dx.doi.org/10.2174/138527212804546831 |
Print ISSN 1385-2728 |
Publisher Name Bentham Science Publisher |
Online ISSN 1875-5348 |
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