Effect of the Composition of a Manganese-Containing Polymer Catalyst on the Kinetics of the Oxidation Reaction of N-Heptane With Molecular Oxygen

Abstract

Catalysts with manganese nanoparticles (5 and 10 wt %) immobilized on poly-4-vinylpyridine were prepared. When interacting with molecular oxygen, the catalyst forms active oxygen, which is involved in the low-temperature oxidation of n-heptane. These catalyst compositions have been used to oxidize n-heptane with pure oxygen to give alcohols, aldehydes and ketones. Oxidation of n-heptane was carried out in the temperature range 303-383 K, molar ratios of heptane:oxygen = 1:3.38, and at atmospheric pressure. It has been found that the non-crosslinked (MnP4VP polymer poly-4-vinylpyridine) and N,N-methylene-bis-acrylamide-crosslinked MnP4VP/MBAA metal-polymer catalyst containing 5 wt % Mn2+ exhibits the highest activity in n-heptane oxidation reactions. The kinetic parameters of the reaction of n-heptane oxidation with oxygen at low temperatures were studied using a kinetic model based on the heptane conversion data. The kinetic model was compiled on the basis of experimental data: heptane:oxygen = 1:3.38 at atmospheric pressure using Mn (wt. 5%) P4VP/MBAA in the temperature range 303-383 K. Within the framework of the chosen kinetic model effective rate constants of the oxidation reaction with the formation of alcohols was calculated

OXIDATION OF n-OCTANE IN THE PRESENCE OF MANGANESE-POLYMER CATALYST AND SELECTION OF THE APPROPRIATE KINETIC MODEL

“…The quaternation of the polymer (poly (4vinylpyridine)) and the synthesis of immobilized catalysts (poly-4-vinylpyridine MnP4VP) are described in [15][16][17] and are not repeated in this article.…”

“…The methodology of kinetic research was the same as in our previous work [15][16][17]. The kinetics of complex reactions of octane with oxygen oxidation was carried out by developed catalytic systems MnP4VP and MnP4VP / MBAA.…”

“…The selection of the kinetic model and the effect of the reaction parameters on the output were carried out as in the previous article [17]. A sequential reaction consisting of two monomolecular stages is considered:…”

“…In our previous work [15][16][17][18], a polymer metal catalyst based on the above was synthesized. Its use in the oxidation reactions of nhexane and n-heptane has shown positive results.…”