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Nanocatalyst on orange peel

26.02.2021

An international team of scientists has created a catalyst by simple mixing in a special mill, without solvents and other additional substances. The basis was the orange peel, which was previously ground. It was placed in the mill chamber, anhydrous form of zinc acetate and 18 steel balls with a diameter of 1 cm were added. The mixture was stirred for 20 minutes at a frequency of 350 rpm, then heated at a temperature of 2 degrees for 200 hours.

The orange peel collected zinc acetate on its surface and helped form transition compounds. During firing, it was partially removed from the mixture - zinc oxide nanoparticles were obtained. After that, using a mill, the zinc oxide nanoparticles were combined with particles containing niobium so that the metal concentration in the final catalyst was from 2,5 to 10%.

The effect of the nanocatalyst was tested by scientists using the example of the conversion of levulinic acid into nitrogen-containing heterocycles. The concentration, in which 10% of particles with niobium and 90% of zinc oxide nanoparticles, turned out to be the most effective. The results showed that 94,5% of levulinic acid was converted to the desired substance. At the same time, only 2,6% - 97,4% of the output products were nitrogen-containing heterocycles.

Levulinic acid, which is easily obtained from biomass, is one of the 10 most promising platform molecules. The conversion of levulinic acid to nitrogen-containing heterocycles has become a very attractive topic in the last few years due to the remarkable ability of heterocycles to serve in the pharmaceutical, agrochemical, and polymer industries.

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