Catalytic activity of H-ZSM-5 and Cu-HZSM-5 zeolites of medium SiO2/Al2O3 ratio in conversion of n-hexane to aromatics

Tursunov, Obid; Kustov, L. М.; Tilyabaev, Zaid

doi:10.1016/j.petrol.2019.06.013

Cited by 37 publications

(23 citation statements)

References 40 publications

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“…2) because they were evenly dispersed over the HZSM5 surface [23][24]. The same results were also obtained by Tursunov et al [23], Din et al [4], and Magomedowa et al [24].…”

Section: Xrd and Xrf Analysissupporting

confidence: 77%

“…The characteristic peaks of CuO, MgO, and ZrO 2 are not visible in the XRD spectra (Fig. 2) because they were evenly dispersed over the HZSM5 surface [23][24]. The same results were also obtained by Tursunov et al [23], Din et al [4], and Magomedowa et al [24].…”

Section: Xrd and Xrf Analysissupporting

confidence: 76%

“…2 shows the XRD spectra of the support before and after loading. The peaks at 2θ (°) 7.95, 8.79, 23.01, 23.84, 24.54, and 45.18° support XRD spectra are identical to HZSM5 [21][22][23]. After metal oxides loading, there was no change in these peaks because metal oxides loading did not damage the structure of HZSM5.…”

Section: Xrd and Xrf Analysismentioning

confidence: 81%

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CuO, MgO, and ZrO<sub>2</sub> Loading on HZSM5 by Deposition-precipitation: Study of Crystallinity, Specific Surface Area, and Morphology

2022

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Bifunctional catalysts are often used in multiple reactions to synthesize certain products. The catalytic activity of bifunctional catalysts is influenced by parameters such as crystallinity, specific surface area, metal distribution, and morphology. Bifunctional catalysts are manufactured by adding metal to the support. The metal loading to the support often affects these parameters. Therefore, this research was conducted to determine the effect of CuO, MgO, and ZrO2 addition to HZSM5 on these parameters. The often-used loading method was deposition precipitation. The pH of the metal-support precursors' solution was increased to basic (pH of 8) to deposit the metal on the support. The loading effect was investigated by producing the following materials: CuO/HZSM5, CuO/ZrO2/HZSM5, CuO/MgO/HZSM5, and CuO/MgO/ZrO2/HZSM5. Each material was characterized using XRD, SAA, SEM, Mapping, EDS, and XRF. The results showed that all metal oxides could be embedded in the HZSM5. The loading of CuO, MgO, and ZrO2 to HZSM5 did not affect the crystallinity (structure) and morphology, increased the specific surface area, and was evenly distributed inside the pore of HZSM5. Further research is needed to determine the effect of crystallinity, specific surface area, and morphology on other metals and support types.

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“…2) because they were evenly dispersed over the HZSM5 surface [23][24]. The same results were also obtained by Tursunov et al [23], Din et al [4], and Magomedowa et al [24].…”

Section: Xrd and Xrf Analysissupporting

confidence: 77%

Section: Xrd and Xrf Analysissupporting

confidence: 76%

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CuO, MgO, and ZrO<sub>2</sub> Loading on HZSM5 by Deposition-precipitation: Study of Crystallinity, Specific Surface Area, and Morphology

2022

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“…The low temperature NH 3 desorption peak at around 220 °C was attributed to the weak acid sites on the surface of the sample. [47,48] The high temperature NH 3 desorption peak at around 550 °C was probably attributed to the strong surface acid sites of the sample, which could be ascribed to the desorption of ammonia strongly interacting with Brønsted acid sites. [49,50] In comparison with the H-MOR sample, the intensity of high temperature desorption peak distinctly decreased for the Fe-MOR samples, which is probably due to the replacement of Brønsted acid protons by cationic iron species.…”

Section: Physicochemical Properties Of the Synthesized Fe-mor Catalystsmentioning

confidence: 99%

Insights into Fe Species Structure‐Performance Relationship for Direct Methane Conversion toward Oxygenates over Fe‐MOR Catalysts

et al. 2022

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Direct oxidation of methane to value-added products under mild conditions remains a grand challenge due to the problem of selective CH 4 activation. Here we report a Fe-MOR-F catalyst prepared via freeze-drying method, indicating excellent catalytic performance for the direct partial oxidation of methane using H 2 O 2 under mild conditions. Various characterizations including XRD, NH 3 -TPD, H 2 -TPR, UV-Vis, XPS, and EPR studies revealed that Fe-MOR-F catalyst possesses more highly dispersed monomeric and dimeric iron species, which is strongly correlated to its high catalytic activity for direct methane oxidation. The DFT calculations indicate the highly dispersed monomeric and dimeric iron species can effectively homoge-nize H 2 O 2 into active hydroxyl groups, while iron clusters can decompose H 2 O 2 into inactive O 2 . The EPR experiments show more •OH was generated on Fe-MOR-F catalyst, which is in line with DFT calculation results. These structural characteristics endow Fe-MOR-F catalyst with superior catalytic performance for direct methane oxidation in terms of oxygenates yield (9.8 mol kg cat À 1 h À 1 ) and selectivity (91.8 %) at 80 °C. This work not only highlights the excellent catalytic performance of methane activation on the highly dispersed monomeric and dimeric iron species, but also promotes the potential application by freeze-drying method for the preparation of the highly dispersed active species.

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“…Various active metals are incorporated to ZSM-5 to enhance its aromatization function for various reactants. Tursunov et al [12] studied aromatization of n-hexane over Cu-HZSM-5 prepared by wet impregnation and reported more aromatic products and less hydrocarbon gases with increasing Cu content. Ni-HZSM-5 catalysts were evaluated by Masalska et al [13] for hexane cracking to form aromatics.…”

Section: Introductionmentioning

confidence: 99%

Aromatization of Commercial Full Range Naphtha Over Modified Hierarchical ZSM‐5 Catalyst

et al. 2021

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Aromatization of commercial full range naphtha has been studied in a fixed bed reactor using the synthesized hierarchical zeolite catalysts. Desilication was carried out on H‐ZSM‐5 support with Silica to Alumina (SiO2/Al2O3) molar ratio 30 to generate additional meso‐porosity and active metal Gallium was incorporated by wetness impregnation method. Various concentrations of sodium hydroxide solutions and two different initial calcination temperature were used during the modification to understand the effect of these parameters on the catalysts. All the catalysts were characterized using nitrogen adsorption, X‐ray diffraction, temperature programmed ammonia desorption, elemental and surface imaging techniques. Catalytic evaluation is done in a fixed bed reactor operated at a temperature of 550 °C, atmospheric pressure and liquid hourly space velocity of 6.0 h−1. Product streams from the fixed bed reactor are analyzed using both online and offline gas chromatographs using ASTM D7833 and D6729 respectively to report product selectivity and mass balance. It is observed that the additional meso porosity and the retention of crystallite phase lead to 62.4 % enhancement in aromatic selectivity and 52.2 % decrease in off‐gas generation for the developed catalyst compared to its non‐desilicated analogue during the aromatization process of full range real naphtha.

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Catalytic activity of H-ZSM-5 and Cu-HZSM-5 zeolites of medium SiO2/Al2O3 ratio in conversion of n-hexane to aromatics

Cited by 37 publications

References 40 publications

CuO, MgO, and ZrO<sub>2</sub> Loading on HZSM5 by Deposition-precipitation: Study of Crystallinity, Specific Surface Area, and Morphology

CuO, MgO, and ZrO<sub>2</sub> Loading on HZSM5 by Deposition-precipitation: Study of Crystallinity, Specific Surface Area, and Morphology

Insights into Fe Species Structure‐Performance Relationship for Direct Methane Conversion toward Oxygenates over Fe‐MOR Catalysts

Aromatization of Commercial Full Range Naphtha Over Modified Hierarchical ZSM‐5 Catalyst

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