Methanol aromatization over Zn-modified HZSM-5 catalysts derived from ZIF-8

Tian, Haifeng; Jiao, Jiapeng; Tian, Hua; He, Hailin; Guo, Xiaojun; Chang, Yaoguang

doi:10.1016/j.fuel.2021.121224

Cited by 17 publications

(6 citation statements)

References 60 publications

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“…Figure 6 c shows two hydroxyl vibration bands at 3610 and 3740 cm –1 on the samples. 32 The introduction of Zn did not create a new measurable hydroxyl vibration peak, indicating that Zn does not form hydroxy Zn ions (Zn(OH) + ) on aluminum hydroxyl groups. The increase in Zn content does cause a weakening in the vibrational peak of the aluminum hydroxy group, indicating that Zn does interact with the aluminum hydroxy group on the molecular sieve.…”

Section: Resultsmentioning

confidence: 97%

“…These results are a further indication that the peaks at 1450 and 1616 cm –1 were caused by the L acid, that the Zn increase enhanced the L acid peak, and that the B acid peak was weakened. Figure c shows two hydroxyl vibration bands at 3610 and 3740 cm –1 on the samples . The introduction of Zn did not create a new measurable hydroxyl vibration peak, indicating that Zn does not form hydroxy Zn ions (Zn(OH) + ) on aluminum hydroxyl groups.…”

Section: Resultsmentioning

confidence: 99%

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In Situ Synthesis of Metal-Containing ZSM-5 and Its Catalytic Performance in Aromatization of Methanol

Zhang

Liu

2022

ACS Omega

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Metal-containing ZSM-5 zeolites, denoted as M/ZSM-5 (M = Ga, Zn, and La), were prepared by an in situ synthetic method. The structural, textural, and surface acid properties of M/ZSM-5 were characterized by XRD, N 2 adsorption–desorption, NH 3 -TPD, and FT-IR. The catalyst pore size and the distribution of strong acid and weak acid were affected by the introduction of metal. Considering the methanol-to-aromatics model reaction, the catalytic performance of these samples was investigated in a fixed bed reactor under the conditions of 450 °C and a liquid weight hourly space velocity (WHSV) of 5 h –1 . The results indicated that the Zn/ZSM-5 molecular sieve was most beneficial to aromatization; the relationship between the change of B/L caused by Zn content and aromatics selectivity was further studied. When the B/L value decreased, the selectivity of aromatics showed an initial increase and then a decrease. The B/L value was optimal, and the aromatics yield was the highest when the Zn loading was 0.35%.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

In Situ Synthesis of Metal-Containing ZSM-5 and Its Catalytic Performance in Aromatization of Methanol

Zhang

Liu

2022

ACS Omega

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“…The detailed carbon number distribution obtained after the product analysis was performed is shown in Table . Under the reaction conditions of P = 0.1 MPa, T = 450°C, P CH 3 OH = 20 kPa, and WHSV = 1.9 h –1 , the initial conversion of methanol on all catalysts was greater than 99.9%, which can be regarded as the complete conversion of methanol . The MTA reaction is a typical acid-catalyzed reaction, and the preparation method and silica–alumina ratio of zeolite have significant effects on its acidity and structure, so changing the preparation method and regulating the Si/Al ratio play a crucial role in the selectivity of products.…”

Section: Resultsmentioning

confidence: 98%

“…Under the reaction conditions of P = 0.1 MPa, T = 450°C, P CHd 3 OH = 20 kPa, and WHSV = 1.9 h −1 , the initial conversion of methanol on all catalysts was greater than 99.9%, which can be regarded as the complete conversion of methanol. 36 The MTA reaction is a typical acidcatalyzed reaction, and the preparation method and silica− alumina ratio of zeolite have significant effects on its acidity and structure, so changing the preparation method and regulating the Si/Al ratio play a crucial role in the selectivity of products. A large specific surface area and suitable acid strength can promote hydrogen transfer and isomeric alkane formation, while higher acid strength favors dehydrogenation and cyclization reactions.…”

Section: Catalytic Performance 321 Effect Of the Preparation Methods ...mentioning

confidence: 99%

Catalytic Performance of Methanol to Aromatics over Hierarchical ZSM-5 Zeolite Synthesized by a Soft Template Method

Tian,

Chen,

Yang

et al. 2023

Energy Fuels

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A method for the direct synthesis of hierarchical zeolites was developed by converting precursors of zeolites and mesoporous copolymers into homogeneous gels using conventional block copolymers as scaffolds. In this method, hydrothermal synthesis is accomplished on a steam-assisted basis, and the dry gel leaves the system free of the liquid water phase, which successfully avoids phase separation between the soft stencil and the solid silica phase. The catalytic performance of hierarchical zeolites was evaluated on a fixed-bed reactor for the methanol-to-aromatics reaction. The hierarchical structure greatly enhances the catalytic activity of the probe reaction due to the increased outer surface, decreased coke formation, and diffusion resistance in the microporous network. The selectivity of BTX reached 65.8%, and there was no significant deactivation after a reaction of 107 h. The transition state and energy barrier for methanol to aromatics were obtained by the minimum energy search of the LST/QST transition state.

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“…Aromatics, especially benzene, toluene, and xylene, are very vital raw materials in the petrochemical industry because they can be widely used in the production of different chemicals, such as polymers, organic solvents, drugs, and dyes. − In addition, these aromatics are essential components in the formulation of advanced biofuels within the gasoline range and jet fuel due to an increasing octane number. The traditional aromatics production technologies mainly include the high-temperature dry distillation of coal, hydrogenation of gasoline, aromatization of light hydrocarbons, and catalytic reforming of naphtha, all of which are heavily dependent on fossil resources and cause environmental pollution by emitting greenhouse gases .…”

Section: Introductionmentioning

confidence: 99%

Catalytic Pyrolysis of Nonedible Oils for the Production of Renewable Aromatics Using Metal-Modified HZSM-5 Catalysts

Liu

Zhang

et al. 2022

ACS Omega

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Catalytic pyrolysis of triglycerides to aromatics over zeolites is an advanced technology for a high value-added utilization of renewable biomass resources. Therefore, in this research, the catalytic performance of M/HZSM-5 catalysts (M = Zn, Ga, In, Ni, and Mo) during the pyrolysis process of glycerol trioleate and the effect of the compositional difference of several woody oils and waste oils on aromatic formation were investigated. Results revealed that Zn/HZSM-5 with appropriate acidity and metal sites reached the maximum aromatics yield (56.13%) and significantly enhanced the catalytic stability. In addition, these renewable nonedible oils were effectively converted to aromatics over the Zn/HZSM-5 catalyst, the aromatic yield of jatropha oil reached up to 50.33%, and the unsaturation and double bond number of feedstocks were crucial for the production of aromatics. The utilization of biomass resources to produce high value-added aromatics can alleviate the problems caused by the shortage of fossil resources and achieve sustainable green development.

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Methanol aromatization over Zn-modified HZSM-5 catalysts derived from ZIF-8

Cited by 17 publications

References 60 publications

In Situ Synthesis of Metal-Containing ZSM-5 and Its Catalytic Performance in Aromatization of Methanol

In Situ Synthesis of Metal-Containing ZSM-5 and Its Catalytic Performance in Aromatization of Methanol

Catalytic Performance of Methanol to Aromatics over Hierarchical ZSM-5 Zeolite Synthesized by a Soft Template Method

Catalytic Pyrolysis of Nonedible Oils for the Production of Renewable Aromatics Using Metal-Modified HZSM-5 Catalysts

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