Issue 9, 2013
From the journal:

Catalysis Science & Technology

Enhancing the performance of SBA-15-supported copper catalysts by chromium addition for the chemoselective hydrogenation of trans-cinnamaldehyde

B. Dragoi,*a   A. Ungureanu,a   A. Chirieac,a   V. Hulea,b   S. Royerc  and  E. Dumitriua  

* Corresponding authors

a Gheorghe Asachi Technical University of Iasi, Faculty of Chemical Engineering and Environmental Protection, 71A D. Mangeron Bdv., 700050 Iasi, Romania
E-mail: bdragoi@tuiasi.ro
Fax: +40-232 271311
Tel: +40-232 278683

b Institut Charles Gerhardt, UMR 5253, CNRS-UM2-ENSCM-UM1, MACS, 8 rue de l’Ecole Normale, 34 296 Montpellier Cedex 5, France

c Université de Poitiers, CNRS UMR 7285, IC2MP, 4 Rue Michel Brunet, 86022 Poitiers Cedex, France

Abstract

SBA-15-supported copper–chromium mixed oxide nanoparticles (CuCr/SBA-15) were prepared by incipient wetness impregnation followed by mild drying at 25 °C and calcination. The Cu : Cr weight ratios were 1 : 1, 5 : 1, and 10 : 1, at a constant total loading of 5 wt%. Monocomponent SBA-15-supported Cu–oxide (Cu/SBA-15) and Cr–oxide (Cr/SBA-15) were prepared as reference samples. The materials were systematically characterized by XRD at low and high angles, N2 physisorption, DR UV-vis, FT-IR, and XPS spectroscopies, and TPR. XRD at low angles and N2 physisorption confirmed the preservation of the mesoporous structure of the SBA-15 support after impregnation and calcination. In the case of monocomponent samples, CuO appeared poorly dispersed, while the Cr species (Cr2O3, mono- and polychromates) appeared highly dispersed on the surface of the SBA-15 support. The progressive addition of chromium to copper had positive effects on the average crystallite size of CuO, which decreased from ∼28 nm (Cu/SBA-15) to ∼3 nm (CuCr/SBA-15; Cu : Cr = 1 : 1), and on reducibility, as well. Metallic active phases were obtained by reducing of the oxide phases under a hydrogen flow at 350 °C. By comparison to the monometallic catalysts, the reduced CuCr/SBA-15 materials were active in the hydrogenation of cinnamaldehyde and chemoselective towards cinnammyl alcohol (>50 mol%). The activity can be correlated with the particle size of copper, whereas the high selectivity to unsaturated alcohol can be associated with the presence of dual Cu0–Crn+ sites.

Graphical abstract: Enhancing the performance of SBA-15-supported copper catalysts by chromium addition for the chemoselective hydrogenation of trans-cinnamaldehyde

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Article information

DOI
https://doi.org/10.1039/C3CY00198A
Article type
Paper
Submitted
24 Mar 2013
Accepted
28 May 2013
First published
29 May 2013

Catal. Sci. Technol., 2013,3, 2319-2329

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Enhancing the performance of SBA-15-supported copper catalysts by chromium addition for the chemoselective hydrogenation of trans-cinnamaldehyde

B. Dragoi, A. Ungureanu, A. Chirieac, V. Hulea, S. Royer and E. Dumitriu, Catal. Sci. Technol., 2013, 3, 2319 DOI: 10.1039/C3CY00198A

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