Part I. review for selective hydrogenation of hydrocarbon, part II. selective hydrogenation of alkyne by a dual Pd and CuFe2O4 catalyst encapsulated in a core/shell silica microsphere

다국어 초록 (Multilingual Abstract)

This thesis is composed of two chapters. In the first chapter, Hydrogenation with respect to organic materials, by definition, is a reaction in which hydrogen adds across a double or triple bond. Catalytic hydrogenations are one of the most important processes in the chemical industry and selectivity is a timely issue. The studies carried out in the last decades have shown that hydrogenation processes of highly unsaturated compounds in hydrocarbon streams can be implemented more or less successfully on supported transition metals. There are various factors to affect catalysts for selective hydrogenation such as supports, promoters, additives and second metal in bimetallic system. these modified catalysts have been shown to have a high selectivity. However, the modified catalysts also often require additives to increase their selectivity. Accordingly, it is desirable to develop a new heterogeneous catalyst that maintains high selectivity in the absence of additives and is easily separated from the reaction mixture.
The second chapter deals with A highly selective heterogeneous catalyst was synthesized using a core/shell silica microsphere in which Pd and CuFe2O4 nanoparticles (NPs) were encapsulated in a silica shell. The dual catalyst was evaluated in terms of its efficacy in the hydrogenation of phenylacetylene. Using the synthesized catalyst, in the absence of toxic additives, we were able to achieve >98% conversion to styrene with selectivity greater than 98%; these results are better than those obtained using commercial Lindlar catalyst. The excellent synergy in the hydrogenation of phenylacetylene was likely a result of the proximal interaction between Pd and CuFe2O4 NPs confined within a silica shell.