Boreskov Institute of Catalysis of the Siberian Branch of Russian ...

PP-III-16Catalytic hydrogenation of triple bond of acetylene alcohols was conducted batchwise in glassreactor equipped with shaker at ambient pressure. In the case of catalytic hydrogenationdifferent solvents and their mixtures were used. The analysis of reaction mixture for all thehydrogenation reactions was performed by gas chromatograph «Kristallux 4000».It is important to note that catalytic oxidation of monosaccharides was also conductedcontinuously using fixed bed pilot reactor.Kinetic investigations of both oxidation and hydrogenation reactions were conducted atvariation of substrate to catalyst ratio, pressure and temperature. Pressure was varied in therange of 0.1 – 7 and 0.1 – 2 MPa, and temperature was varied in the range of 25 – 150 and 0 –95 °C in the case of catalytic oxidation and hydrogenation reactions, respectively.Physicochemical (TEM, AFM, XRD, FTIR, XPS, BET, NMRS) investigations of thenanocatalysts were conducted and the hypotheses of reaction mechanisms were proposed.Results and discussion. On the base of physicochemical investigations for (i) catalysts itwas assumed that bimetallic NPs have different structure. In case of (ii) nanocatalysts the useof «layer-by-layer» preparation method was found to provide the higher stability of catalyticsystem than monolayered one. HPS was found to effectively control the MNPs growth due tothe existence of nanosized microvoids. For all investigated catalysts the interaction of activecomponent of the catalyst with the solvent, support, modifier and substrate was found to takeplace. The diameter of MNPs was determined to be equal to 2 – 3 nm.Investigated methods for nanocatalysts synthesis allowed to develop highly active,selective (selectivity reached up to 99% at 100% conversion) and stable catalytic systems.Conclusion. High active, selective (selectivity reached up to 99% at 100% conversion)and stable catalytic systems of hydrogenation, enantioselective hydrogenation and directoxidation were developed and investigated in different reactors and conditions.AcknowledgementsWe sincerely thank to Sixth framework programme N 506621-1 and NATO science forpeace programme Sfp 981438 for financial support.References1. E. Sulman, L. Bronstein, V. Matveeva, M. Sulman, et al., Polymer stabilized Pd and Pt nanoparticles:Structure and catalytic properties, Nanocatalysis (2006), 51-982. L. Bronstein, S. Sidorov, P. Valetsky, Russian Chemical Reviews, 2004, 73, (5), 501-515.334