Template synthesis, structure, sorption properties and acidity of micro-mesoporous materials obtained from sol-precursor of zeolite BEA

Shcherban, Nataliya D.; Barakov, Roman; Yaremov, P. S.; Solomakha, V. N.; Gryn, Svitlana; Khaynakova, Olena; Ilyin, Vladimir G.

doi:10.1007/s10934-014-9781-z

Cited by 9 publications

(4 citation statements)

References 24 publications

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“…With an increase in phosphorus content there is a slight increase in this band's intensity, mostly for the P(2.5)− BEA zeolite; this band is assigned to terminal hydroxyl group species −SiOH− located in the external surface of the zeolite, formed by tetrahedral aluminum removal that occurs as a consequence of the dealumination process when impregnation with phosphorus takes place. 3,17,18 Furthermore, for zeolites with P, a decrease in the bands at 3785 and 3665 cm −1 is observed. These bands are assigned to AlOOH + species and Al−OH groups located in the external surface, respectively.…”

Section: Resultsmentioning

confidence: 89%

“…In addition, spectra of materials with phosphorus also show a modification in the band located close to 3745 cm –1 . With an increase in phosphorus content there is a slight increase in this band’s intensity, mostly for the P(2.5)–BEA zeolite; this band is assigned to terminal hydroxyl group species −SiOH– located in the external surface of the zeolite, formed by tetrahedral aluminum removal that occurs as a consequence of the dealumination process when impregnation with phosphorus takes place. ,, Furthermore, for zeolites with P, a decrease in the bands at 3785 and 3665 cm –1 is observed. These bands are assigned to AlOOH + species and Al–OH groups located in the external surface, respectively. , The less intense signal observed at 3700 cm –1 is attributed to the presence of P–OH groups and it is more notorious in P(0.5)–BEA and P(2.5)–BEA zeolites.…”

Section: Results and Discussionmentioning

confidence: 96%

“…Figure 7 shows FT-IR spectra recorded in the OH region for each zeolite. When there is presence of phosphorus, there is an intensity loss in the absorption band at 3610 cm −1 , corresponding to OH vibrations in hydroxyl groups −SiOH−Al (Brønsted acid sites), 17 specially for P(2.5)−BEA material. In addition, spectra of materials with phosphorus also show a modification in the band located close to 3745 cm −1 .…”

Section: Resultsmentioning

confidence: 99%

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Phosphorous-Modified Beta Zeolite and Its Performance in Vacuum Gas Oil Hydrocracking Activity

et al. 2019

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The present work reports the synthesis of beta zeolite and its modification with phosphorous in different percentages of P2O5 (1 and 5%) and vacuum gas oil (VGO) hydrocracking (HCK) conversion and yield to naphtha and middle distillates. The solids were characterized by X-ray diffraction, elemental analysis by atomic absorption spectroscopy and inductively coupled plasma atomic emission spectrometry (ICP-AES), N2 adsorption, 27Al magic angle spinning-nuclear magnetic resonance (27Al-MAS-NMR), temperature-programmed desorption of ammonia (NH3-TPD) and isopropylamine (IPam-TPD), pyridine adsorption followed by Fourier transform infrared spectroscopy (Py-FTIR), hydrogen temperature-programmed reduction, transmission electron microscopy, and energy-dispersive X-ray (TEM–EDX). The catalysts were tested in a tubular reaction system at 350 °C, 10 342 kPa, H2/feed: 1250 NL/L, LHSV: 1 h–1 with prehydrotreated VGO. Overall activity and middle distillates and naphtha yields were influenced by the phosphorous impregnation on beta zeolite. Between 4 and 6% higher conversion was observed. Textural and acid properties were modified by the phosphorous treatment leading to a total acidity and surface area decrease with phosphorous content. Relative changes in tetrahedral and extra-framework aluminum were followed by 27Al-MAS-NMR. AlT (4) assigned to distorted extra-lattice tetrahedral aluminum and AlO (2) extra-framework aluminum increased with phosphorous impregnation. Strong acidity monitored by IR of adsorbed pyridine showed a direct correlation with VGO conversion and naphtha yields.

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Section: Resultsmentioning

confidence: 89%

Section: Results and Discussionmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

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Phosphorous-Modified Beta Zeolite and Its Performance in Vacuum Gas Oil Hydrocracking Activity

et al. 2019

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“…Hybrid micro-mesoporous materials based on precursors of ZSM-5, ZSM-11, b, Y, mordenite, and others zeolites [20][21][22][23] containing zeolite secondary building units in a framework walls [6,24], and composite ones containing the phases of zeolite and MMS [25,26] were obtained. At the same time the search and optimization of the conditions for the formation of such materials remain topical.…”

Section: Introductionmentioning

confidence: 99%

Two-stage dual template alkali metal-free synthesis of micro-mesoporous aluminosilicates based on ZSM-5 zeolite precursors

et al. 2016

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Carrying out the dual template synthesis (in the presence of molecular and micellar templates) in the alkali metal-free reaction media (pH 11.7-12) at a relatively lowtemperature hydrothermal treatment (100-120°C, duration 3-5 days) allowed to obtain micro-mesoporous aluminosilicates combining the properties of zeolite ZSM-5 and mesoporous molecular sieve AlSi-MCM-41. X-ray amorphous sol-precursors of ZSM-5 zeolite obtained by preliminary hydrothermal treatment of alkali metal-free reaction mixture at 160°C and containing secondary building units of zeolite were used as initial substances for synthesis of micro-mesoporous aluminosilicates. During the joint formation of the structure of zeolite and mesoporous molecular sieve in one reaction mixture and in contiguous conditions close to optimal for their individual formation, composites zeolite/mesoporous molecular sieve were formed. The structural and sorption characteristics and acidity of the obtained composites differ from mechanical mixture of two phases. X-ray amorphous micro-mesoporous aluminosilicate with secondary building units and precursors of ZSM-5 in mesostructure is characterized by higher concentration and strength of Brønsted and Lewis acid sites as well as a higher catalytic activity in the reaction of cracking of cumene compared to AlSi-MCM-41 of similar composition. This aluminosilicate also exhibits a higher total selectivity toward the major products of reaction, in comparison with ZSM-5.Keywords Micro-mesoporous aluminosilicates Á Dual template alkali metal-free synthesis Á Zeolite ZSM-5 precursors Á The degree of zeolitization Á Structure and sorption properties Á Acidity Á Catalytic cracking of cumene

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Study on Isobutane/1-Butene Alkylation Over Phosphorus-Modified HY Zeolite

et al. 2023

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Template synthesis, structure, sorption properties and acidity of micro-mesoporous materials obtained from sol-precursor of zeolite BEA

Cited by 9 publications

References 24 publications

Phosphorous-Modified Beta Zeolite and Its Performance in Vacuum Gas Oil Hydrocracking Activity

Phosphorous-Modified Beta Zeolite and Its Performance in Vacuum Gas Oil Hydrocracking Activity

Two-stage dual template alkali metal-free synthesis of micro-mesoporous aluminosilicates based on ZSM-5 zeolite precursors

Study on Isobutane/1-Butene Alkylation Over Phosphorus-Modified HY Zeolite

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