Facile synthesis of highly dispersed and thermally stable copper-based nanoparticles supported on SBA-15 occluded with P123 surfactant for catalytic applications

• Published in: Journal of catalysis Vol. 339; pp. 270 - 283
• Main Authors: Chirieac, Alexandru, Dragoi, Brindusa, Ungureanu, Adrian, Ciotonea, Carmen, Mazilu, Irina, Royer, Sebastien, Mamede, Anne Sophie, Rombi, Elisabetta, Ferino, Italo, Dumitriu, Emil
• Format: Journal Article
• Language: English
• Published: San Diego Elsevier Inc 01-07-2016; Elsevier BV; Elsevier
• Subjects: Catalysis; Chemical Sciences; Chemical synthesis; Copper; Copper-based nanoparticles; Hydrogenation; Inorganic chemistry; Material chemistry; Nanoparticles; Oxidation; P123 surfactant; SBA-15; Surfactants; P123 surfactant; Oxidation; Copper-based nanoparticles; SBA-15; Hydrogenation
• ISSN: 0021-9517; 1090-2694
• DOI: 10.1016/j.jcat.2016.04.004

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•Copper-based NPs were prepared by IWI-MD on P123-SBA-15 hybrid silica.•The dispersion of NPs was higher than for those prepared by precipitation on SBA-15.•NPs loaded on P123-SBA-15 showed high activity for hydrogenation of CNA.•NPs loaded on P123-SBA-15 are cost-effective and efficient catalysts for CO oxidation.
Here, we show a strategy to control the dispersion, spatial distribution, and stabilization of copper-based nanoparticles on a micro–mesoporous silica support, as well as their impact on the catalytic activity. In this respect, SBA-15 with P123 occluded mesopores was used as host to load, by impregnation, copper-based nanoparticles, whose dispersion was similar to that of the homologous NPs prepared by precipitation on the SBA-15 with open mesoporosity, while the thermal stability was better. The oxide and reduced forms of the catalysts were rigorously characterized by ICP-OES, low- and high-angle XRD, N2 physisorption, HRTEM/EDXS, TPR, in situ XRD, and in situ XPS. Due to their high practical impact, both the oxide and metallic forms of the copper-based NPs were evaluated for catalytic activity in CO oxidation and hydrogenation of cinnamaldehyde, respectively. It was shown that the high dispersion of copper-based NPs and the electron-deficient sites, such as M2+ with high affinity for the CO bond, are responsible for the outstanding catalytic performance of the solids. The paper demonstrates that using a simple impregnation method and a functionalized SBA-15 support, high-performance materials can be obtained avoiding the use of precipitating agents and strict control of the synthesis conditions.