Influence of the development of a system of nanoscale pores in a mordenite-containing rock on its selectivity for di-branched products of n-hexane hydroisomerization

Voloshyna, Yuliya; Pertko, Olexandra; Povazhnyi, Volodymyr; Patrylak, Lyubov; Yakovenko, A. V.

doi:10.1007/s13204-022-02632-1

Cited by 3 publications

(5 citation statements)

References 20 publications

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“…A similar effect of solutions of different concentrations, when a less concentrated acid mainly affected the "unblocking" of micropores, while a more concentrated acid affected the development of mesopores, was observed for acid-modified predominantly mordenite rock, 14 as well as for alkali-treated mordenite catalysts. 30 Thus, sample #2-A5 is characterized by the largest volume of pores, both micro-and meso-, among the catalysts based on rock #2.…”

Section: Characterization Of the Samplessupporting

confidence: 53%

“…Catalysts based on natural zeolites were tested in the transformation of linear hexane and 2-methylpentane to evaluate their activity and determine the influence of the parameters of the porous structure on the distribution of products. Earlier, 14 it was established for catalysts based on Transcarpathian zeolite rock that starting with a content of 2.5 wt. %, nickel forms particles of a regular size of about 10 nm, which cannot be localized in narrow pores for the close interaction of acidic and hydrogenating-dehydrogenating sites.…”

Section: Catalytic Investigationsmentioning

confidence: 99%

“…The prospect of using natural zeolites of Transcarpathia with predominantly mordenite components for these purposes was investigated. [10][11][12][13][14] However, Transcarpathian deposits of zeolite rocks often contain, in a tight genetic mixture with mordenite or separately, clinoptilolite with close to mordenite Si/Al ratio, and therefore, similar acidic characteristics of these natural zeolites can be expected. Clinoptilolite is much less studied as a catalyst for the isomerization of alkanes, however, there are works indicating the effectiveness of natural clinoptilolite of various origins in other catalytic reactions: isomerization of n-butene, 15 α-pinene, 16,17 and limonene, 18 dehydration of methanol, 19 liquid phase hydrogenation of citral.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Modifying the Clinoptilolite-Containing Rocks of Transcarpathia on Their Porous Characteristics and Catalytic Properties in the Conversion of C6-Hydrocarbons

Voloshyna¹,

Pertko²,

Povazhnyi³

et al. 2023

ChChT

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Section: Characterization Of the Samplessupporting

confidence: 53%

Section: Catalytic Investigationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Modifying the Clinoptilolite-Containing Rocks of Transcarpathia on Their Porous Characteristics and Catalytic Properties in the Conversion of C6-Hydrocarbons

Voloshyna¹,

Pertko²,

Povazhnyi³

et al. 2023

ChChT

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show abstract

“…The choice of zeolite components for obtaining composites was based on the analysis of the results of previous studies [32][33][34][35]. Synthetic MFI type powdered zeolite with a ratio of SiO 2 /Al 2 O 3 = 41 and a static capacity for water and heptane vapors of 0.07 cm 3 /g and 0.18 cm 3 /g, respectively, was used as a base of the rst component.…”

Section: Catalyst Preparationmentioning

confidence: 99%

“…The H-form of the zeolites was obtained by calcining the NH 4 -form at 873 K for 3 h. To do this, rst, cations of the initial forms of zeolites (0,5-1 mm fraction) were exchanged for NH the samples (0,5-1 mm fraction) with a 5 mol/L HCl solution according to [35]. The degree of dealumination determined by chemical analysis has amounted to 40%.…”

Section: Catalyst Preparationmentioning

confidence: 99%

Metal-containing zeolite composites with separated phases as catalysts for hydroisomerization of linear hexane

Voloshyna,

Pertko,

Yakovenko

et al. 2024

J Porous Mater

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In this work, composite catalytic systems of natural mordenite and synthetic MFI-type zeolite containing Pd and Ni nanoparticles (0.5-1.5% by weight in total) were prepared by mechanical mixing (1:1), optionally with the addition of α-or γ-Al 2 O 3 as a binder. The samples were examined using IR spectroscopy, X-ray diffractometry, transmission electron microscopy, low-temperature nitrogen ad(de)sorption, and tested in the model reaction of n-hexane hydroisomerization in a micro-pulse mode to determine the effect of composition on the peculiarities of linear alkane transformation.It has been shown that in the obtained catalytic systems, modi cations of aluminum oxide used as a binder affect the effectiveness of catalysts in the conversion of n-hexane. This is explained by the different dispersity of α-and γ-Al 2 O 3 particles, which causes different porosity of the result composites, and possibly by the interaction of zeolite acid sites with binder acid sites, which leads to changes in their characteristics depending on the modi cation of aluminum oxide. In this respect, α-Al 2 O 3 proved to be better than γ-Al 2 O 3 .Synergy between the two zeolite components in the formation of isomers has been found out, which was more effective in samples with an isotropic distribution of zeolite phases. In the applied micro-pulse reaction mode, the composite catalyst prepared without a binder was the best, showing a signi cantly lower temperature of the maximum yield of isomerization products and a high yield of dimethyl-branched isomers, and having selectivity for n-hexane isomers at the level of high selectivity of the Pd-containing component.

show abstract

Metal-containing zeolite composites with separated phases as catalysts for hydroisomerization of linear hexane

Voloshyna,

Pertko,

Yakovenko

et al. 2024

Preprint

Self Cite

View full text Add to dashboard Cite

In this work, composite catalytic systems of natural mordenite and synthetic MFI-type zeolite containing Pd and Ni nanoparticles (0.5–1.5% by weight in total) were prepared by mechanical mixing (1:1), optionally with the addition of α- or γ-Al2O3 as a binder. The samples were examined using IR spectroscopy, X-ray diffractometry, transmission electron microscopy, low-temperature nitrogen ad(de)sorption, and tested in the model reaction of n-hexane hydroisomerization in a micro-pulse mode to determine the effect of composition on the peculiarities of linear alkane transformation. It has been shown that in the obtained catalytic systems, modifications of aluminum oxide used as a binder affect the effectiveness of catalysts in the conversion of n-hexane. This is explained by the different dispersity of α- and γ-Al2O3 particles, which causes different porosity of the result composites, and possibly by the interaction of zeolite acid sites with binder acid sites, which leads to changes in their characteristics depending on the modification of aluminum oxide. In this respect, α-Al2O3 proved to be better than γ-Al2O3. Synergy between the two zeolite components in the formation of isomers has been found out, which was more effective in samples with an isotropic distribution of zeolite phases. In the applied micro-pulse reaction mode, the composite catalyst prepared without a binder was the best, showing a significantly lower temperature of the maximum yield of isomerization products and a high yield of dimethyl-branched isomers, and having selectivity for n-hexane isomers at the level of high selectivity of the Pd-containing component.

show abstract

Influence of the development of a system of nanoscale pores in a mordenite-containing rock on its selectivity for di-branched products of n-hexane hydroisomerization

Cited by 3 publications

References 20 publications

Effect of Modifying the Clinoptilolite-Containing Rocks of Transcarpathia on Their Porous Characteristics and Catalytic Properties in the Conversion of C6-Hydrocarbons

Effect of Modifying the Clinoptilolite-Containing Rocks of Transcarpathia on Their Porous Characteristics and Catalytic Properties in the Conversion of C6-Hydrocarbons

Metal-containing zeolite composites with separated phases as catalysts for hydroisomerization of linear hexane

Metal-containing zeolite composites with separated phases as catalysts for hydroisomerization of linear hexane

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