Прегледај по Аутор "Perušić, Mitar"

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    Influence of the SiO2 Al2O3 molar ratio on the specific properties of NaA zeolite
    (Springer, 2022) Paprica, Nikola; Filipović, Radislav; Perušić, Mitar; Kostić, Duško; Pantić, Slavko; Damjanović, Vladimir
    The aim of this research was to determine the influence of the SiO2/ Al2O3 molar ratio on the specific commercial properties of NaA zeolite subtypes as final market products (4A,4A-AG and 4A-MS) under the real production and process conditions. The value of the SiO2/ Al2O3 molar ratio, so-called silicate module, was set as independently variable and the effect on the physical and chemical properties of each of the subtypes of NaA zeolites was examined. The paper investigates how the SiO2/ Al2O3 molar ratio affects specific properties of NaA powders, namely the ion exchange capacity, oil adsorption capacity and water adsorption capacity. Some previous theoretical and experimental studies have shown that the molar ratio plays a crucial role in the formation of these very similar but for final application different subtypes of NaA zeolite. The experimental part of this work was performed and tested in real production conditions, which can be considered as an advantage in relevance to the obtained results. Various analytical and instrumental testing methods were used for the analysis of the obtained powders, including SEM, XRD and PSD analyses.
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    The effect of glucose on the formation of the nanocrystalline transition alumina phases
    (Elsevier, 2011) Obrenović, Zoran; Milanović, Marija; Djenadić, Ružica R.; Stijepović, Ivan; Giannakopoulos, Konstantinos P.; Perušić, Mitar; Nikolić, Ljubica M.
    Series of alumina powders were synthesized starting from sodium aluminate solution prepared from Bayer liquor. The neutralisation of sodium aluminate solution was performed with the use of sulphuric acid. The influence of glucose as a non-surfactant additive on the structure of alumina powders at moderate pH was investigated. The results show that the properties of the powders are influenced by the initial pH value of the solution, as well as the duration of the neutralisation step. High pHs lead to the formation of powders with heterogeneous structure with bayerite as a dominant phase, which during calcinations converts to h-alumina with high surface area. Addition of glucose to the starting aluminate solution leads to the formation of nanocrystalline boehmite with estimated average crystallite size less than 3 nm and high surface area (above 300 m2/g). After calcinations, boehmite transforms to g-alumina. The results have shown that during the heat treatment, structural transformations proceeded simultaneously with the significant changes in the textural properties of the obtained mesoporous g- and h-alumina powders