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

Rakitskaya, T. L.; Kiose, T. A.; Golubchik, K. O.; Еннан, А. А.; Volkova, V. Ya.

doi:10.1186/s13065-017-0256-6

Cited by 21 publications

(18 citation statements)

References 28 publications

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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%

“…Pillared clays were not studied as supports for metal complex compounds which could be active at ambient temperatures in the reactions of deactivation of some toxic gaseous substances, e.g. CO, SO 2 , and O 3 [18][19][20]. As can be seen [18][19][20][21][22][23][24], anchored metal complex catalysts for CO oxidation necessarily contain palladium(II) and copper(II) compounds.…”

Section: Introductionmentioning

confidence: 99%

“…CO, SO 2 , and O 3 [18][19][20]. As can be seen [18][19][20][21][22][23][24], anchored metal complex catalysts for CO oxidation necessarily contain palladium(II) and copper(II) compounds. Mainly, their catalytic activity can be improved by varying the support nature, the nature and concentrations of palladium(II) and copper(II) precursors, introduction of ligands, L, and by changing Pd(II):Cu(II):L ratio.…”

Section: Introductionmentioning

confidence: 99%

“…Mainly, their catalytic activity can be improved by varying the support nature, the nature and concentrations of palladium(II) and copper(II) precursors, introduction of ligands, L, and by changing Pd(II):Cu(II):L ratio. As for halide ligands (L = Cl − , Br − , and I − ), palladium-copper complexes with bromide ligands demonstrated the maximum catalytic activity in the reaction of CO oxidation with air oxygen [18][19][20]. Our previous investigations [19,20,24] showed that chemical and phase compositions, structural, structural-adsorption, and physicochemical properties of natural minerals and their modified forms substantially influence the catalytic activity of palladium-copper complexes in the above-named reaction.…”

Section: Introductionmentioning

confidence: 99%

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

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

et al. 2019

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“…This is due to the impossibility of keeping the air humidity constant. However, in many cases, some previous treatment (modification) of natural sorbents (such as boiling in water or acid or through calcination) is required for increasing the activity of the metal complex compounds that are anchored on them [20]. Those kinds of treatment result in changes in the structural-adsorption parameters and the physicochemical properties of supports, particularly in their water vapor adsorption capacities.…”

Section: Introductionmentioning

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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Synthesis and Characterizations of High Crystallized Clinoptilolite by Structure Directing Agent Method and its Crystallization Kinetics

et al. 2021

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The clinoptilolites (CPs) with high purity were prepared via structure directing agent (SDA) method combining with hydrothermal method using silica sol as the silica source and aluminum hydroxide as the aluminum source. Their structural features were characterized by X-ray diffraction (XRD) patterns, Fourier transform infrared (FT-IR) spectra, thermal gravimetric (TG) analysis, scanning electron micrograph (SEM) images, 29 Si nuclear magnetic resonance (NMR) profiles. The effects of additive amount and aging time of used SDA, as well as synthetic parameters such as crystallization temperature and crystallization time on their structure and performance were emphasized. Particularly, the activation energies of their crystallization kinetics at different stages of induction period and growth period were calculated on the basis of Arrhenius equation. The results demonstrated that the obtained CPs presented the highest relative crystallinity when the additive amount of used SDA was 1 mL at aging periods of 2 d, otherwise, their relative crystallinity degree was low due to existences of a large number of heterocrystal impurities. Particularly, the apparent activation energy values for induction (E n) and growth (E g) profile were calculated by the Arrhenius equation. The E n value (86.46 kJ/mol) of induction period was much higher than that E g value (9.64 kJ/mol) of growth stage, suggesting that the induction period was the main controlling step during the synthetic CP. Finally, the synthetic CP was employed to preliminarily assess its performances for CH 4 /N 2 separation. These demonstrations provide a promising method for the synthesis of CPs.

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

Cited by 21 publications

References 28 publications

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

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

Synthesis and Characterizations of High Crystallized Clinoptilolite by Structure Directing Agent Method and its Crystallization Kinetics

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