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Castel Guelfo di Bologna, Italy

Bonelli R.,Dip. Chimica Industriale e Dei Materiali | Bonelli R.,Consortium for Science and Technology of Materials | Albonetti S.,Dip. Chimica Industriale e Dei Materiali | Albonetti S.,Consortium for Science and Technology of Materials | And 5 more authors.
Applied Catalysis A: General | Year: 2011

The total oxidation of methanol and toluene, chosen as representative VOCs, was investigated over CeO2-supported Au/FeOx catalysts prepared utilizing the bimetallic carbonyl cluster salt [NEt4] [AuFe4(CO)16]. Characterization data showed that the catalysts prepared by the reported method exhibit highly and homogeneously dispersed iron oxide species on the ceria support together with small gold nanoparticles, whose size increases on increasing the amount of gold/iron. Addition of iron oxide species did not substantially increase the methanol combustion activity of ceria, whereas the presence of the mixed gold and FeOx species has been found to strongly enhance the activity towards the total oxidation of methanol. In the case of the toluene combustion the addition of FeOx or FeOx/Au species caused a significant decrease in the activity of the bare CeO2. The above catalytic behavior was rationalized on the basis of different interactions occurring among gold, iron oxide and cerium oxide, which synergically affects both the reactivity of the surface oxygen and the capacity of the support to adsorb the organic reactant. © 2011 Elsevier B.V. Source


Bonelli R.,Dip. Chimica Industriale e Dei Materiali | Bonelli R.,Consortium for Science and Technology of Materials | Lucarelli C.,Dip. Chimica Industriale e Dei Materiali | Lucarelli C.,Consortium for Science and Technology of Materials | And 6 more authors.
Applied Catalysis A: General | Year: 2011

A series of Au/FeOx/SBA-15 type materials were prepared by two methods: one conventional and one non-conventional: gold deposition- precipitation on FeOx/SBA-15 and bimetallic carbonyl cluster deposition on SBA-15, respectively. Both chemical physical characterization and catalytic activity tests in the complete combustion of methanol show that the new preparation method of Au/FeOx-supported catalysts leads to the anchoring of the Au by modifying the surface of SBA-15 with FeOx species. This effect results in a considerable improvement in catalyst performance as compared to the classic preparation by deposition-precipitation of Au on SBA-15 and FeOx/SBA-15. © 2011 Elsevier B.V. Source


Albonetti S.,Dip. Chimica Industriale e Dei Materiali | Albonetti S.,Consortium for Science and Technology of Materials | Bonelli R.,Dip. Chimica Industriale e Dei Materiali | Bonelli R.,Consortium for Science and Technology of Materials | And 9 more authors.
Studies in Surface Science and Catalysis | Year: 2010

A novel preparation method was developed for the preparation of iron and gold/iron supported catalysts using metallic carbonyl clusters as precursors of highly dispersed nanoparticles over TiO2 and CeO2. A series of catalysts with different metal loadings were prepared and tested in the complete oxidation of methanol and the preferential oxidation of CO in the presence of H2 (PROX) as model reactions. The characterization by BET, XRD, TEM, H2-TPR, ICP-AES and XPS spotlights the interaction between Au and Fe and their influence on the catalytic activity. © 2010 Elsevier B.V. All rights reserved. Source


Pasini T.,Dip. Chimica Industriale e Dei Materiali | Piccinini M.,University of Cardiff | Blosi M.,CNR Institute of Science and Technology for Ceramics | Bonelli R.,Dip. Chimica Industriale e Dei Materiali | And 8 more authors.
Green Chemistry | Year: 2011

The oxidation of 5-hydroxymethyl-2-furfural was studied under mild reaction conditions using TiO 2-supported Au and Au-Cu catalysts synthesized from pre-formed nanoparticles. Bimetallic gold-copper catalysts display superior activity as compared to monometallic gold. Moreover, after reaction, the bimetallic Au-Cu catalysts can be recovered by filtration and reused without significant loss of activity and selectivity whereas gold materials are not stable. STEM-HAADF imagining and XEDS spectra obtained from bimetallic materials show that particles are homogeneous AuCu alloys. No AuCu ordering or segregation effects were noted from these analyses, and the Au:Cu ratio was quite consistent from particle-to-particle irrespective of its absolute size, proving the efficiency of the original method of synthesis utilized. Isolation effects of gold by copper in the alloy nanoparticles is imagined to play a pivotal role in the reaction. The effect of oxygen pressure, metal loading, reaction time, amount of base and temperature were studied in detail and a 99% yield of furandicarboxylic acid was achieved under optimized reaction conditions. © 2011 The Royal Society of Chemistry. Source


Albonetti S.,Dip. Chimica Industriale e Dei Materiali | Pasini T.,Dip. Chimica Industriale e Dei Materiali | Lolli A.,Dip. Chimica Industriale e Dei Materiali | Blosi M.,CNR Institute of Science and Technology for Ceramics | And 7 more authors.
Catalysis Today | Year: 2012

5-Hydroxymethyl-2-furfural (HMF) oxidation to furandicarboxylic acid (FDCA) was performed under mild reaction conditions using TiO 2-supported Au and Au-Cu catalysts synthesized from pre-formed nanoparticles of different composition. Catalysts were characterized by BET, XRD and XPS. The Au 3Cu 1/TiO 2 catalyst exhibited the best catalytic performance for FDCA yield. Moreover, after reaction, bimetallic Au-Cu catalysts with high gold content can be recovered by filtration and reused without significant loss of activity and selectivity; whereas, the monometallic gold materials are not stable. © 2012 Elsevier B.V. Source

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