DOI: https://doi.org/10.24144/2414-0260.2018.2.57-64

ДИФЕРЕНЦІЙНО-ТЕРМІЧНИЙ АНАЛІЗ СКЛАДНОЇ КАТАЛІТИЧНОЇ СИСТЕМИ ТИПУ хCrРО4уNi3(РО4)2

N. P. Golub, E. O. Golub, A. A. Kozma, N. M. Foros, Yu. Yu. Kish, V. I. Gomonay

Анотація


Individual phosphates of cobalt and nickel and seven new complex oxide catalytic systems based on chromium phosphate were synthesized by modifying it with ions of Nі2+ type xCrPO4´yNi3(PO4)2 with different content of both phosphates having acidic surface properties. The modern methods of analysis have studied the composition, structure and some physical and chemical parameters of all synthesized samples. The influence of the synthesis conditions on the nature of the formation of their structure and the corresponding physico-chemical and catalytic properties was studied with the help of differential-thermal analysis. It is established that for synthesized binary samples, various forms of water that are part of their composition are characteristic: adsorbed, structural, crystallization, constitutional, etc. Allocating them from the structure of catalysts in the process of heat treatment is accompanied by various effects and corresponding endo-effects. In this case, the kinetics of water thermosorption from the surface and from the volume of internal pores depends on the nature of the interaction between the molecules in the adsorption layers and water molecules on the surface. In the allocation of adsorbed water from phosphate catalysts, the change in the type of anion is not observed. However, the elimination of crystallization, and especially constitutional water, is accompanied by a rupture of chemical bonds, intense diffusion of water vapor from the lattice and rearrangement of phosphate anion. All synthesized phosphates have different curves of DTA, which are different from individual phosphates of cromium and nickel, and with each other. After calcining at 700°C and at higher temperatures, all synthesized complex catalytic phosphate systems exist in the form of anhydrous salts, which is confirmed by the data of X-ray diffraction, IR spectroscopic and chemical analyzes. Thus, the results obtained are in good agreement with [24, 25] and show that, as it was predicted, when changing the composition of the chromium-nickel-phosphate system, it was possible to obtain catalysts, on the surface of which formed certain chemical structures that could form the corresponding optimal surface complexes and detect special catalytic properties in the processes of partial oxidation of n-alkanes in valuable products.

Ключові слова


catalysis; catalyst; heterogeneous oxidation; partial oxidation of n-alkanes; C1-C4– hydrocarbons

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Посилання


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