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| Description: | MST colloquium Friday, May 22, 2015 Speaker Ioannis Lykakis Affiliation Department of Chemistry, Aristotle University of Thessaloniki Title Organic transformations catalyzed by supported noble metal nanoparticles and polyoxometalates Location Department of Physics Bldg., Voutes, 3rd floor Seminar Room Time 16:00 Language English Abstract For catalytic processes, an attractive approach is the use of a solid, recyclable catalyst and environmentally friendly reagents. The use of supported catalysts on a well ordered metal oxide surface for heterogeneous catalysis offers several advantages on the catalyst reusability and the regio- and chemo-selectivity of the reaction process. Thus, herein we outline a research study aimed to gain insight into the catalytic applications of new AuNPs and AgNPs heterogeneous systems,1 as well as supported polyoxometalates2 in order to afford new catalytic chemical transformations, based on the combination of metal nanoparticles and the surface of the support properties.1-4 For this reason, the catalytic reduction of nitro aromatic compounds by AuNPs or AgNPs supported catalysts using NaBH4 and 1,1,3,3-tetramethyldisiloxane (TMDS) as hydrogen donor molecules5 and the selective oxidation of aryl amines into nitrosoarenes with H2O2 catalyzed by Au/TiO2 were studied. In parallel, the general applicability and the mechanistic approach of the selective photooxidation of various benzyl alcohols into the corresponding carbonyl compounds, over mesoporous CdS or POM-TiO2 assemblies, using O2 as green oxidant were also studied.6,3 Finally, detail mechanistic studies based on kinetic isotope effects, on Hammett type-kinetics and product analysis were performed. References [1] (a) Mitsudome, T.; Kaneda, K. Green Chem. 2013, 15, 2636; (b) Stratakis, M.; Garcia, H. Chem. Rev. 2012, 112, 4469; (c) Zhang, Y.;Cui, X.; Shi, F.; Deng, Y. Chem. Rev. 2012, 112, 2467. [2] Hill, C. L., (Ed.) Chem. Rev., 1998, 98, 1; J. Mol. Catal. A: Chem., 2007, 262, 1. [3] Tzirakis, M. D.; Lykakis, I. N.; Orfanopoulos, M. Chem. Soc. Rev., 2009, 38, 2609. [4] Corma, A.; Serna, P. Science 2006, 313, 332. [5] (a) Tamiolakis, I.; Fountoulaki, S.; Vordos, N.; Lykakis, I. N.; Armatas, G. S. J. Mater. Chem. A, 2013, 1, 14311; (b) Fountoulaki, S.; Daikopoulou, V.; Gkizis, P. L.; Tamiolakis, I.; Armatas, G. S.; Lykakis, I. N. ACS Catalysis, 2014, 4, 3504. [6] Tamiolakis, I.; Lykakis, I. N.; Katsoulidis, A. P.; Armatas, G. S.; Chem. Commun., 2012, 48, 6687. |
| Location: | Department of Physics Bldg., Voutes, 3rd floor Seminar Room |
| Status: | Waiting for approval |
| Date: | Friday, May 22, 2015 |
| Time: | 16:00-17:00 EEST |
| Duration: | 1 hour |
| Priority: | 5-Medium |
| Access: | Public |
| Created by: | Lila Kalogeraki |
| Updated: | Friday, May 22, 2015 10:53 GMT |