INFLUENCE OF THE ORDER OF INTRODUCTION OF A Co-Mo-CONTAINING ACTIVE COMPONENT ON THE PHYSICOCHEMICAL PROPERTIES OF ALUMINUM OXIDE SYSTEMS
Abstract
During the research, a number of samples of supported metal-containing catalysts were synthesized by impregnation with an excess of impregnating solution with different orders of introducing active components. The study of the obtained samples revealed the effect of the order of introducing active components on the physicochemical and catalytic properties of the sample. Cobalt nitrate and molybdenum blue synthesized by preliminary mechanical activation of a molybdenum-containing precursor were used as sources of active metals. The blue also served as a source of structure-forming metal. Mechanical activation was carried out under relatively mild conditions (acceleration of grinding bodies = 5G), which simplifies the synthesis of the systems. Industrial pseudoboehmite powder served as a carrier, from which γ-Al2O3 was obtained by heat treatment. The obtained systems were studied by IR spectroscopy and scanning electron microscopy. The IR spectra showed similar profiles of the systems; in both cases, heat treatment allowed almost complete elimination of nitrogen-containing components. The removal of nitrogen-containing components was recorded by a decrease in the intensity of the absorption band in the region of 1380-1400 cm-1. Scanning electron microscopy showed that the method of introducing the active component affects the textural characteristics, the specific surface area changes significantly, but heat treatment at 400 °C neutralizes this effect. Based on the data from processing about 1000 particles, the average particle size for each sample was calculated. It was found that depending on the order of introduction, this parameter differs almost twofold. Thus, it can be concluded that the order of introduction does not significantly affect the chemical composition of the surface, some textural and morphological properties are subject to significant changes.
For citation:
Zhirov N.А., Akimov Al.S., Sudarev Е.А., Akimov A.С. Influence of the order of introduction of a Co-Mo-containing active component on the physicochemical properties of aluminum oxide systems. ChemChemTech [Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.]. 2025. V. 68. N 8. P. 52-57. DOI: 10.6060/ivkkt.20256808.3t.
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