Water vapor adsorption by nanostructured polyphase compositions based on the solid component of welding aerosol

Rakitskaya, Tetyana L; Truba, A. S.; Еннан, А. А.; Dlubovskii, R. M.; Volkova, V. Ya.

doi:10.1177/0263617416688691

Cited by 6 publications

(4 citation statements)

References 15 publications

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“…Mechnikov National University, Odessa, Ukraine). Previously, the samples were de-gassed at 110 • C for 2 h [28]. Their specific surface areas were estimated by the BET method, their pore size distribution curves were determined using desorption branches of their isotherms, and their pore radii were estimated using the Kelvin equation [15].…”

Section: Methodsmentioning

confidence: 99%

Water Vapor Adsorption by Some Manganese Oxide Forms

Rakitskaya

Truba

Dzhyga

et al. 2018

Colloids and Interfaces

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Manganese oxide forms prepared by different methods differ by their compositions, phase ratios in polyphase samples, and crystallite sizes (XRD and TEM characterization). Among the phases, tunnel-structured β-MnO2 (pyrolusite), α-MnO2 (cryptomelane), ε-MnO2 (akhtenskite), and β-Mn2O3 (bixbyite) have been identified. Water vapor sorption isotherms showed substantial differences in the affinities of water molecules to oxide surfaces of the manganese oxide forms under study. The parameters of the BET equation and pore size distribution curves have been calculated. The manganese oxide forms have mesoporous structures characterized by uniform and non-uniform pore sizes as well as by moderate hydrophilic behavior.

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Section: Methodsmentioning

confidence: 99%

Water Vapor Adsorption by Some Manganese Oxide Forms

Rakitskaya

Truba

Dzhyga

et al. 2018

Colloids and Interfaces

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“…6). Thus, a conclusion can be drawn that a S sp value is not a critical factor influencing the catalytic activity of palladium-copper complexes anchored not only on Al-PILC but also on natural sorbents that has been shown in some our reports [18,20,23,25]. Thermodynamic parameters of adsorbed water, particularly, a water activity and an ability of water molecules to protolytic dissociation depend on structural and physicochemical properties of a support.…”

Section: Pd(ii)-cu(ii)/s Nanocomposition Testing In the Reaction Of Cmentioning

confidence: 65%

“…Water vapor adsorption/desorption was studied gravimetrically using a vacuum setup temperature-controlled at 21 ± 0.2 °C containing a conventional McBain-Bakr silica-spring balance [25].…”

Section: Methodsmentioning

confidence: 99%

Pd(II), Cu(II), and pillared clay based nanocatalysts for low-temperature CO oxidation

et al. 2019

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Pillared clays (PILCs) are little-studied as supports in compositions of anchored metal complex catalysts. In the work, pillared clay, Al-PILC, was prepared by using Ukrainian natural bentonite, N-Bent, and the aluminum polycation, [Al 13 O 4 (OH) 24 (H 2 O) 12 ] 7+ (Al 13), as an intercalating agent. The final product was used for preparing К 2 PdCl 4-Cu(NO 3) 2-KBr/ Al-PILC nanocatalysts by an impregnation method. Initial N-Bent and Al-PILC as well as the nanocompositions based on them were characterized by XRD, FT-IR spectroscopy, DTG-DTA, water vapor adsorption, and pH metry. К 2 PdCl 4-Cu(NO 3) 2-KBr/S compositions (S were N-Bent or Al-PILC) were tested in the reaction of CO oxidation with air oxygen at temperature of 20 °C and a relative humidity of 67%. It has been found that the preliminary modification of natural bentonite by Al 13 intercalation results in formation of the nanostructured catalyst with a crystallite size of 19 nm showing the maximum activity in the reaction under study at C Pd(II) = 2.72 × 10 −5 mol/g and copper(II) concentrations of 2.9 × 10 −5 and 5.9 × 10 −5 mol/g.

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“…The specific surface areas were estimated with the Brunauer-Emmett-Teller (BET) method. Their pore size distribution curves were determined using desorption branches of their isotherms, and their pore radii were estimated using the Kelvin equation [23]. Figure 1 shows some examples of the most differing XRD patterns for natural and thermally modified tripoli samples.…”

Section: Methodsmentioning

confidence: 99%

Effect of Both the Phase Composition and Modification Methods on Structural-Adsorption Parameters of Dispersed Silicas

Rakitskaya

Kiose

Golubchik

et al. 2018

Colloids and Interfaces

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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.

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Water vapor adsorption by nanostructured polyphase compositions based on the solid component of welding aerosol

Cited by 6 publications

References 15 publications

Water Vapor Adsorption by Some Manganese Oxide Forms

Water Vapor Adsorption by Some Manganese Oxide Forms

Pd(II), Cu(II), and pillared clay based nanocatalysts for low-temperature CO oxidation

Effect of Both the Phase Composition and Modification Methods on Structural-Adsorption Parameters of Dispersed Silicas

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