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Nanocatalysts for sustainable industrial processses
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Abstract(s)
In Chapter 1, rhodium nanoparticles were supported on multiwalled carbon
nanotubes (MWCNTs) and bound to the magnetic core-shell system Fe3O4@TiO2. The
composite Fe3O4@TiO2-Rh-MWCNT and the intermediates were characterized by
SEM, EDS and TEM. Their catalytic activity was studied using i) the hydrogenation
transfer of nitroarenes and cyclohexene in the presence of hydrazine hydrate; ii) the
reduction of 2-nitrophenol with NaBH4; and iii) the decoloration of pigments in the
presence of hydrogen peroxide. The results were monitored by gas chromatography (i)
and UV Visible (ii and iii).
In the second chapter, the catalytic activity of six oxidovanadium(V) aroylhydrazone complexes, viz. [VOL1(OEt)][VOL1(OEt)(EtOH)] (1), [VOL2(OEt)] (2), [Et3NH][VO2L1] (3), [VO2(H2L2)]2·EtOH (4), [VOL1(µ -O)VOL1] (5) and [VOL2(µ -O)VOL2] (6) (H2L1 = 3,5-di-tert-butyl-2-hydroxybenzylidene)-2hydroxybenzohydrazide and H2L2 = 3,5-di-tert-butyl-2-hydroxybenzylidene)-2
aminobenzohydrazide), anchored on nanodiamonds with different treatments, was
studied towards the microwave-assisted partial oxidation of 1-phenylethanol to
acetophenone in the presence of tert-butyl hydroperoxide (TBHP) as oxidant. A high
selectivity for acetophenone was achieved for the optimized conditions. The possibility
of recycling and reuse the heterogeneous catalysts was also investigated.
In chapter 3, the catalytic activity of gold nanoparticles supported at different metal
oxides, such as Fe2O3, Al2O3 ZnO or TiO2, was studied for the above reaction. The
effect of the support, quantity of the catalyst and temperature was investigated. The
recyclability of the gold catalysts was also studied.
In the last chapter, a new copper nanocomposite with functionalized mutiwalled
carbon nanotubes (Cu-MWCNT) was synthesized using a microwave assisted polyol
method. The characterization was performed using XRD and SEM. The catalytic
activity of Cu-MWCNT was studied through the degradation of pigments, such as
amaranth, brilliant blue, indigo, tartrazine and methylene blue.
Description
Keywords
Nanoparticle Magnetic catalyst Gold Vanadium Rhodium Copper Heterogenization Oxidation Hydrogenation Nanochemistry and Nanomaterials . Faculdade de Ciências Exatas e da Engenharia