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Research Article

JCR. 2020; 7(6): 1222-1229


BOUNDARY DIMENSIONS OF NANOPARTICLE ACTIVITY DURING CHEMICAL MODIFICATION OF THEIR COMPOSITION

Rakhimov Tokhir, Mukhamediev Mukhtarjan, Gafurova Dilfuza, Makhkamov Muzaffar, Shakhidova Dilbar.

Abstract
Studying the catalytic activity in low-temperature oxidation of CO using palladium-containing nanosystems as an example, the question was studied: does and how does the change in the state of palladium in the composition of palladium-containing nanoparticles affect the size of the boundaries of the phase transition that delimits the nano-state. As a result, the relationship between the sizes of palladium-containing nanoparticles deposited on polymer fibers and their catalytic properties was revealed. It has been shown that in unreduced nano-catalysts, CO oxidation occurs on the surface of relatively small nanoparticles, and with an increase in the reduction depth, a smooth shift of the boundaries of active fractions to the region of large nanoparticles is observed. This suggests that it is on the faces of the crystal lattice, and not on the edges and peaks, that the active centers of autocatalysis are formed at which the catalytic oxidation of CO by oxygen occurs.

Key words: Nanotechnology, Catalysis, Oxidation, Carbon monoxide, Size effects of nanoparticles, Auto-Catalysis, Active centers, Self-oscillating processes.



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