Influence of water content in the Pd(II)-Cu(II) catalyst fixed on acid-modified basalt tuff on its activity in the carbon monoxide oxidation by oxygen

Rakitskaya, T. L.; Kiose, T. A.; Oleksenko, L. P.; Lutsenko, L. V.; Dlubovskii, R. M.; Volkova, V. J.

doi:10.1134/s1070427212090078

Cited by 3 publications

(4 citation statements)

References 2 publications

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“…A further appreciable decrease in pH st is observed only for 3H-CLI at approximately the same ΔpH s value. Taking into consideration the results of our earlier works [4, 24, 31, 32, 35, 36], this decrease in pH of the aqueous suspension may be one of factors promoting formation of the surface palladium–copper composition optimal for realizing catalytic CO oxidation.…”

Section: Resultsmentioning

confidence: 97%

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Acid-modified clinoptilolite as a support for palladium–copper complexes catalyzing carbon monoxide oxidation with air oxygen

Rakitskaya

Kiose

Golubchik

et al. 2017

Chemistry Central Journal

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Samples of natural clinoptilolite were modified by an acid–thermal method at nitric acid concentrations of 0.25, 0.5, 1.0, and 3.0 M and a contact time of 30 min. A series of catalysts, K2PdCl4–Cu(NO3)2–KBr/S (S = 0.25H-CLI, 0.5H-CLI, 1H-CLI, and 3H-CLI) was obtained. All samples were investigated by X-ray phase and thermogravimetric analysis, FT-IR spectroscopy, water vapor ad/desorption and pH metric method. Besides, K2PdCl4–Cu(NO3)2–KBr/S samples were tested in the reaction of low-temperature carbon monoxide oxidation. It have been found that, owing to special physicochemical and structural-adsorption properties of 3H-CLI, it promotes formation of the palladium–copper catalyst providing carbon monoxide oxidation at the steady-state mode down to CO concentrations lower than its maximum permissible concentration at air relative humidity varied within a wide range.

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Section: Resultsmentioning

confidence: 97%

“…Depending on the aim of a research, acid concentrations may be varied in a wide range [7, 12, 16]. To prepare anchored palladium–copper complexes characterizing by the maximum catalytic activity towards carbon monoxide oxidation, it is necessary to choose an acid concentration optimal for each specific support [35, 36]. …”

Section: Backgoundmentioning

confidence: 99%

Acid-modified clinoptilolite as a support for palladium–copper complexes catalyzing carbon monoxide oxidation with air oxygen

Rakitskaya

Kiose

Golubchik

et al. 2017

Chemistry Central Journal

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“…As one of the most common rock types in the world, basalt contains rich MgO, CaO, and low amounts of SiO 2 and alkali oxides, which could be used as CO 2 adsorbents [121]. Early in 2012, natural basalt tuff could be modified by HNO 3 to construct Pd(II)-Cu(II)/basalt composite through the impregnating method [122]. This study showed the water contents of catalyst samples were negatively correlated to their reaction activity of low-temperature CO oxidation in a specific range of 1.6-7.2 wt%.…”

Section: Basalt-supported Photocatalystmentioning

confidence: 99%

Mineral-Supported Photocatalysts: A Review of Materials, Mechanisms and Environmental Applications

Simon

Bekheet

et al. 2022

Energies

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Although they are of significant importance for environmental applications, the industrialization of photocatalytic techniques still faces many difficulties, and the most urgent concern is cost control. Natural minerals possess abundant chemical inertia and cost-efficiency, which is suitable for hybridizing with various effective photocatalysts. The use of natural minerals in photocatalytic systems can not only significantly decrease the pure photocatalyst dosage but can also produce a favorable synergistic effect between photocatalyst and mineral substrate. This review article discusses the current progress regarding the use of various mineral classes in photocatalytic applications. Owing to their unique structures, large surface area, and negatively charged surface, silicate minerals could enhance the adsorption capacity, reduce particle aggregation, and promote photogenerated electron-hole pair separation for hybrid photocatalysts. Moreover, controlling the morphology and structure properties of these materials could have a great influence on their light-harvesting ability and photocatalytic activity. Composed of silica and alumina or magnesia, some silicate minerals possess unique orderly organized porous or layered structures, which are proper templates to modify the photocatalyst framework. The non-silicate minerals (referred to carbonate and carbon-based minerals, sulfate, and sulfide minerals and other special minerals) can function not only as catalyst supports but also as photocatalysts after special modification due to their unique chemical formula and impurities. The dye-sensitized minerals, as another natural mineral application in photocatalysis, are proved to be superior photocatalysts for hydrogen evolution and wastewater treatment. This work aims to provide a complete research overview of the mineral-supported photocatalysts and summarizes the common synergistic effects between different mineral substrates and photocatalysts as well as to inspire more possibilities for natural mineral application in photocatalysis.

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“…Our practice [8,10,11,15] shows that temperature of 110 °C is optimal for catalyst drying in the process of obtaining metal-complex catalysts supported on natural materials. Taking into account that the water content in the catalyst composition takes a considerable part in achievement of its high catalytic activity in the case of CO oxidation [16] and there is a certain difference between thermochemical behavior of bentonites under study, it is important to quantify the specific amount of water (m sp ) residual in all bentonite samples after their drying at 110 °С. To this end, it is necessary to determine the weight losses in the temperature ranges of 25-110 °С and 25-300 °С ( Table 2).…”

Section: Methodsmentioning

confidence: 99%

Thermochemical and catalytic properties of modified bentonites

Rakitskaya¹,

Kiose²,

Oleksenko³

et al. 2015

Him. Fiz. Tehnol. Poverhni

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Influence of water content in the Pd(II)-Cu(II) catalyst fixed on acid-modified basalt tuff on its activity in the carbon monoxide oxidation by oxygen

Cited by 3 publications

References 2 publications

Acid-modified clinoptilolite as a support for palladium–copper complexes catalyzing carbon monoxide oxidation with air oxygen

Acid-modified clinoptilolite as a support for palladium–copper complexes catalyzing carbon monoxide oxidation with air oxygen

Mineral-Supported Photocatalysts: A Review of Materials, Mechanisms and Environmental Applications

Thermochemical and catalytic properties of modified bentonites

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