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ON THE EFFECT OF ZEOLITE TYPE ON THE FORMATION OF PD-CO NANOPARTICLES AND THEIR CATALYTIC PROPERTIES IN SELECTIVE HYDROGENATION OF FURFURAL
Abstract
Selective hydrogenation of biomass-derived molecules catalyzed by metals is in high demand, but is challenging due to complex reaction pathways. Furfural (FF) is a highly effective chemical produced by processing agricultural and woodworking waste and used to produce furfuryl alcohol (FA), furan, 2-methylfuran, tetrahydrofurfuryl alcohol, etc. Furfuryl alcohol is used in the production of acid-resistant polymer concrete, fiberglass, paint and varnish materials (as a film-forming agent), as well as to create various resins and furan derivatives. The most commonly used noble metal catalysts in the hydrogenation of FF to FA are based on Pd nanoparticles stabilized with various carriers and modified with transition metals. This report presents data on the formation of bimetallic Pd-Co nanoparticles deposited on zeolites such as ZSM-5, Mordenite, Beta, Y. The data were obtained by physico-chemical methods: TEM, XRD, XPS, low-temperature nitrogen adsorption. The properties of the obtained catalysts in the selective hydrogenation of furfural to furfuryl alcohol are investigated. The design of catalysts based on metal nanoparticles formed in a porous zeolite matrix and an understanding of their complex relationships between structure and properties are necessary for the implementation of catalytic reactions of biomass processing. Due to the nature of the zeolite support, in particular, the pore size, acidity, and hydrophilic-hydrophobic properties, zeolites largely determine the size, dispersion, and location of metal nanoparticles, particularly Pd-Co, directly affecting the selective hydrogenation of furfural. It is assumed that the combination of Pd and Co in zeolite cells changes the electronic structure, promoting vertical adsorption of the carbonyl group, which leads to selectivity with respect to furfuryl alcohol.
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