Synthesis and Investigation of Catalytic Properties of Metal-Polymer Nanocomposites Based on Unsaturated Polyester Resins
Burkeyeva G.K. Kovaleva A.K. Ibadullaeva M.N. Ubaydullauly M. Plocek J. Sergaziyeva K.E.
2024E.A. Buketov Karaganda University Publish house
Eurasian Journal of Chemistry
2024#29Issue 3148 - 159 pp.
This paper focuses on the hydrogenation process in metal-polymer complexes based on copolymers of polypropylene glycol fumarate phthalate and polypropylene glycol maleate phthalate, using acrylic acid and immobilized cobalt metal particles as catalysts. A classical reaction of the electrocatalytic hydrogenation of pyridine to piperidine was applied. SEM and dynamic light scattering were utilized to investigate the average size and dispersity of cobalt metal nanoparticles. The experimental findings show that the efficiency of hydrogenation can be improved by increasing the temperature from 25 to 40 °C and the current to 2 A. More specifically, increasing the temperature to 40 °C promotes swelling of the polymer and its transition from a globular collapsed state to an open one, which leads to an increase in the number of active catalytic centers and, as a consequence, acceleration of the hydrogenation process. Increasing the current strength to 2 A also helps to increase the rate of the hydrogenation process. Further increasing the current to 3 A is undesirable due to an increase in the yield of by-products and a decrease in the yield of the target product, piperidine. Based on a comparative analysis, it was established that the use of a copolymer of polypropylene glycol maleate phthalate with acrylic acid as the polymer matrix base is the most preferable for obtaining polymermetal complexes with nanosized cobalt.
catalytic activity , electrocatalytic hydrogenation , metalpolymer complex , nanocatalysts , nanocatalytic systems , nanoparticles , polypropylene glycol fumarate phthalate , polypropylene glycol maleate phthalate , unsaturated polyesters
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Department of Organic Chemistry and Polymers, Karaganda Buketov University, Universitetskaya street, 28, Karaganda, 100024, Kazakhstan
Research Institute of Chemical Problems, Karaganda Buketov University, Universitetskaya street, 28, Karaganda, 100024, Kazakhstan
Institute of Inorganic Chemistry of the Czech Academy of Sciences, Husinec-Rez, Czech Republic
Department of Organic Chemistry and Polymers
Research Institute of Chemical Problems
Institute of Inorganic Chemistry of the Czech Academy of Sciences
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