Hierarchical Nanospherical ZSM-5 Nanosheets with Uniform Al Distribution for Alkylation of Benzene with Ethanol

Saenluang, Kachaporn; Imyen, Thidarat; Wannapakdee, Wannaruedee; Suttipat, Duangkamon; Dugkhuntod, Pannida; Ketkaew, Marisa; Thivasasith, Anawat; Wattanakit, Chularat

doi:10.1021/acsanm.9b02568

Cited by 34 publications

(27 citation statements)

References 71 publications

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“…Before measuring spectra, the zeolite sample was pretreated by 10 v/v% of N 2 at 500 • C for 1 h with the temperature ramp rate of 10 • C min −1 . Subsequently, pyridine was introduced into the chamber at its vapor pressure at 40 • C for 1 h. After removing the physically adsorbed pyridine under vacuum for 1 h, the spectra were recorded at 150 • C [47].…”

Section: Characterization Of Catalystsmentioning

confidence: 99%

In Situ Synthesis of Sn-Beta Zeolite Nanocrystals for Glucose to Hydroxymethylfurfural (HMF)

et al. 2020

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The Sn substituted Beta nanocrystals have been successfully synthesized by in-situ hydrothermal process with the aid of cyclic diquaternary ammonium (CDM) as the structure-directing agent (SDA). This catalyst exhibits a bifunctional catalytic capability for the conversion of glucose to hydroxymethylfurfural (HMF). The incorporated Sn acting as Lewis acid sites can catalyze the isomerization of glucose to fructose. Subsequently, the Brønsted acid function can convert fructose to HMF via dehydration. The effects of Sn amount, zeolite type, reaction time, reaction temperature, and solvent on the catalytic performances of glucose to HMF, were also investigated in the detail. Interestingly, the conversion of glucose and the HMF yield over 0.4 wt% Sn-Beta zeolite nanocrystals using dioxane/water as a solvent at 120 °C for 24 h are 98.4% and 42.0%, respectively. This example illustrates the benefit of the in-situ synthesized Sn-Beta zeolite nanocrystals in the potential application in the field of biomass conversion.

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Section: Characterization Of Catalystsmentioning

confidence: 99%

In Situ Synthesis of Sn-Beta Zeolite Nanocrystals for Glucose to Hydroxymethylfurfural (HMF)

et al. 2020

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“…To verify the type of acid sites obtained in the prepared composites, FTIR profiles of pyridine adsorbed on ZSM‐5@MgAlO x (y) are shown in Figure S9. Typically, the IR bands at 1445, 1490 and 1545 cm −1 are attributed to pyridine adsorbed on Lewis acid (L), Lewis acid+Brønsted acid sites (L+B), and Brønsted acid sites (B), respectively . With respect to the ZSM‐5@MgAlO x (y), the trace amount of Lewis acid sites is observed on the pristine ZSM‐5.…”

Section: Resultsmentioning

confidence: 99%

“…Typically, the IR bands at 1445, 1490 and 1545 cm À 1 are attributed to pyridine adsorbed on Lewis acid (L), Lewis acid + Brønsted acid sites (L + B), and Brønsted acid sites (B), respectively. [62,63] With respect to the ZSM-5@MgAlO x (y), the trace amount of Lewis acid sites is observed on the pristine ZSM-5. As expected, a number of Lewis acid sites of the ZSM-5@MgAlO x (y) increase significantly as a function of deposited oxides content and as can be seen in TableS2 the substantial decrease in the ratio of Brønsted acid sites/Lewis acid sites (B/L) is observed.…”

Section: Characterization Of Catalystsmentioning

confidence: 99%

Modified Acid‐Base ZSM‐5 Derived from Core‐Shell ZSM‐5@ Aqueous Miscible Organic‐Layered Double Hydroxides for Catalytic Cracking of n‐Pentane to Light Olefins

et al. 2020

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Over the past decades, the catalytic cracking catalysts for hydrocarbon oil upgrading have been extensively developed to increase the yield of light olefins. In this context, we report the fabrication of the core‐shell ZSM‐5@aqueous miscible organic‐layered double hydroxides prepared by the growth of layered double hydroxides (LDH) precursors on zeolite surfaces. The deposited LDH results in a decrease of the number of strong Brønsted acid sites on zeolite surfaces and its transformation at high temperature leads to produce the highly dispersed metal oxides deposited on external surfaces of zeolites. Therefore, the acid‐base properties of designed surfaces are modified, eventually resulting in the suppression of competing hydride transfers and further side reactions. As a result, there is a significant enhancement in light olefins production compared with the pristine zeolite. In addition, the designed catalysts exhibit high recycling stability and reusability. This first example opens up the new perspectives for the development of modified acid‐base zeolites using zeolite@aqueous miscible organic‐layered double hydroxides for the catalytic upgrading of hydrocarbons.

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“…Для моделирования работы всех колонн, показанных на рисунке 2, использовали их существующие конструкционные параметры. [15][16][17][18][19][20].…”

Section: результаты и обсуждениеunclassified

Reconstruction of the hardware design for isopropylbenzene production for the production of ethylbenzene

Попов

Крымкин

Хабибрахманова

et al. 2021

Vestn. Voronež. gos. univ. inž. tehnol.

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The hardware design of the rectification unit for the production of isopropylbenzene in the presence of the AlCl3 catalyst is considered, the use of which has a number of problems associated with its corrosiveness, rapid deactivation, the complexity of regeneration, etc. One of the possible solutions to the listed technological disadvantages is the use of heterogeneous zeolite-containing catalysts. In this case, during the reconstruction of the existing production of isopropylbenzene in the technological scheme of separation of alkylate, three rectification columns are released, which are expediently used to separate the alkylate of ethylbenzene production. To study the possibility of using the discharging distillation columns, a computational experiment was carried out using the Honeywell UniSim Design modeling system, in which a model of the alkylate separation unit for ethylbenzene production was formed. The NRTL method was used as a mathematical package for calculating the thermodynamic properties of the mixture components. As a result of modeling the operation of the alkylate separation unit for each distillation column, the optimal operating process parameters were obtained: pressure of the top and bottom of the column, reflux ratio, temperature profile along the height of the column. The calculated material balance of the technological scheme shows that in the first distillation column, complete separation of benzene from the alkylation reaction mass is achieved, the second column ensures the production of commercial ethylbenzene, and in the third column, a fairly clear separation of diethylbenzene from the remaining components of the mixture is obtained. The performed computational experiment showed that for the organization of the stable operation of the technological scheme for the separation of alkylate in the production of ethylbenzene, it is possible to use all the considered distillation columns without changing their design parameters at a load on the reaction mass of alkylation of about 60 t / h.

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Hierarchical Nanospherical ZSM-5 Nanosheets with Uniform Al Distribution for Alkylation of Benzene with Ethanol

Cited by 34 publications

References 71 publications

In Situ Synthesis of Sn-Beta Zeolite Nanocrystals for Glucose to Hydroxymethylfurfural (HMF)

In Situ Synthesis of Sn-Beta Zeolite Nanocrystals for Glucose to Hydroxymethylfurfural (HMF)

Modified Acid‐Base ZSM‐5 Derived from Core‐Shell ZSM‐5@ Aqueous Miscible Organic‐Layered Double Hydroxides for Catalytic Cracking of n‐Pentane to Light Olefins

Reconstruction of the hardware design for isopropylbenzene production for the production of ethylbenzene

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