Abstract
Tripoli from two Ukrainian deposits was studied in its natural and modified forms. The investigation of natural and modified tripoli involves the identification of their phase compositions through X-ray diffraction and the analysis of their water vapor adsorption-desorption isotherms. The obtained results are evidence of changes in the structural-adsorption parameters of tripoli as a result of modification. Their treatment in boiling water or acid causes apparent alterations of contents of the main phases and sizes of their crystallites, whereas their calcination causes not only the dehydroxylation of surfaces and the agglomeration of phases, but even phase transformation in the case of carbonate tripoli. After analyzing water vapor adsorption-desorption isotherms of natural and modified tripolis, some correlations between their adsorption parameters, phase compositions, main phase contents and crystallite sizes have been found.
Highlights
Water vapor adsorption-desorption is one of the most important properties of natural and synthetic sorbents, determining possibilities for their use in ecological, energy-saving and nuclear safety applications [1,2,3,4]
The development and use of supported metallic, metal oxide, and metal-complex catalysts for air purification from toxic gaseous substances such as PH3, CO, SO2, and O3 [5,6,7,8] is connected with investigations of the adsorption-desorption parameters of the sorbents used as supports with respect to water vapor [5,6]
For obtaining the anchored metal complex catalysts, it is necessary to study the adsorption properties of sorbents towards metal ions [17] and the affinity of water molecules to sorbent surfaces [5,6,18,19]. This is due to the fact that the activity of the anchored metal complex catalysts substantially depends on the water contents that are in them
Summary
Water vapor adsorption-desorption is one of the most important properties of natural and synthetic sorbents, determining possibilities for their use in ecological, energy-saving and nuclear safety applications [1,2,3,4]. For obtaining the anchored metal complex catalysts, it is necessary to study the adsorption properties of sorbents towards metal ions [17] and the affinity of water molecules to sorbent surfaces [5,6,18,19]. This is due to the fact that the activity of the anchored metal complex catalysts substantially depends on the water contents that are in them. Water is able to build up in the process of the catalyst operation in personal protective equipment, such as in gas masks or respirators
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