Catalytic Properties of Palladium Nanoparticles Deposited on Undoped and Nitrogen Doped Carbon Nanofibres in Selective Hydrogenation of Acetylene (300,00 руб.)

Химия в интересах устойчивого развития 24 (2016) 521–527 UDC 541.128+544.47 DOI: 10.15372/KhUR20160412 Catalytic Properties of Palladium Nanoparticles Deposited on Undoped and Nitrogen Doped Carbon Nanofibres in Selective Hydrogenation of Acetylene V. V. CHESNOKOV1,2, O. YU. <...> PODYACHEVA1,2 and Z. R. ISMAGILOV1,2 1Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia E-mail: chesn@catalysis.ru 2Institute of Coal Chemistry and Material Science, Federal Research Center of Coal and Coal Chemistry, Siberian Branch, Russian Academy of Sciences, Kemerovo, Russia Abstract Palladium in the concentration of 0.04–0.5 mass% was deposited on carbon nanofibres with the stack structure. <...> The state of finely dispersed palladium nanoparticles deposited on the carbon nanofibres was studied by physical methods. <...> It was found that palladium nanoparticles in the atomic state were responsible for the high selectivity of the catalyst in acetylene hydrogenation to ethylene. <...> Doping of carbon nanofibres by nitrogen atoms substantially alters the properties of supported palladium nanoparticles. <...> The activity of the catalysts decreases whereas their selectivity substantially increases Key words: palladium nanoparticles, carbon nanofibres, nitrogen doping, hydrogenation INTRODUCTION Olefins are the most important feedstock for industrial organic synthesis. <...> Industrial synthesis of unsaturated hydrocarbons commonly includes cracking of various oil alkanes, from light gaseous fractions C2–C3 to heavy liquid fractions such as naphtha and gas oil [1, 2]. <...> For example, in stereoregular polymerization of ethylene these impurities rapidly poison Ziegler–Natta catalysts and drastically lower the quality of resulting polymers. <...> It should be noted also that the reactions of selective hydrogenation of alkynes or dienes are structure-sensitive. <...> According to studies with model catalysts, the (110) face of Pd showed a higher selectivity in the formation of butenes as compared to the (111) face [6, 7]. <...> It was also found [8, 9] that catalyst deactivation under the action of reaction medium depends on the accessible faces of crystals. <...> It was supposed [10] that alumina was a source of the strongest acid sites that catalyze oligomerization processes on the catalyst surface. <...> In distinction to conventional supports (for example, Al2O3), carbon supports do not contain acid sites that <...>