Simplified Kinetic Modeling of Propane Aromatization over Ga-ZSM-5 Zeolites: Comparison with Experimental Data

Migliori, Massimo; Aloise, A.; Catizzone, Enrico; Caravella, Alessio; Giordano, G.

doi:10.1021/acs.iecr.7b02868

Cited by 15 publications

(15 citation statements)

References 53 publications

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“…Catalytic conversion of propane was performed at a reaction temperature of 540 °C and 1 atm. Conversion of propane to aromatics involves a series of reaction steps which include: dehydrogenation of propane to propene, oligomerization of formed alkenes from dehydrogenation, subsequent cracking (alkenes further conversion), new oligomers formation through alkenes alkylation followed by a hydrogen transfer and dehydrogenation, and cyclization and aromatization [6,23,29,34,40]. Dehydrogenation of propane is one of most important process of propane aromatization as it begins the reaction steps upon which subsequent reaction depends.…”

Section: Catalytic Performancementioning

confidence: 99%

“…Dehydrogenation of propane is one of most important process of propane aromatization as it begins the reaction steps upon which subsequent reaction depends. It had been established that acidity of dehydrogenating metalmodified ZSM-5 is a vital factor affecting catalytic conversion of alkanes in heterogeneous catalysis reaction and corresponding selectivity towards aromatics [40,41]. Figure 8 showed the effect of the Iron and zinc loading on parent ZSM-5.…”

Section: Catalytic Performancementioning

confidence: 99%

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Highly selective and stable Zn–Fe/ZSM-5 catalyst for aromatization of propane

et al. 2020

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Light alkane aromatization for aromatic compound production, used in petrochemical industries is an attractive area of research. The effect of second metal co-impregnation was investigated in stabilizing zinc on ZSM-5 in aromatization of propane. HZSM-5 was modified with zinc and iron metal by co wet-impregnation and characterized using XRF, XRD, BET, N2-adsorption, FTIR, FTIR-Pyridine, SEM, TEM, H2-TPR and XPS. The effect of different loadings of Iron on Zn/ZSM-5 was investigated on acidity, aromatic yield, product distribution and aromatization performance. Performance test was conducted in a fixed bed reactor at 540 °C, one atmosphere. GHSV of 1200 mL/g-h. Co-impregnation of Zn with Fe improved the catalytic activity and aromatic yield for 10 h time on stream as compared to parent HZSM-5 and Zn/ZSM-5 of very low aromatic yield and propane conversion. Impregnation of Zn as the dehydrogenating metal on HZSM-5 steadily increased aromatic yield from 5% on HZSM-5 to 25% and was steadily dropped to 20% after 10 h TOS. The co-impregnation of iron of 1–3 wt% loading as the second metal for zinc stability with 2 wt% Zn on ZSM-5 improved propane conversion and aromatic yield to 55% for the 10 h TOS. This further enhanced aromatic product distribution and minimized light gases.

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Section: Catalytic Performancementioning

confidence: 99%

Section: Catalytic Performancementioning

confidence: 99%

Highly selective and stable Zn–Fe/ZSM-5 catalyst for aromatization of propane

et al. 2020

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“…Several studies have examined the effectiveness of zeolite catalysts (HZSM‐5, USY, and SBA‐15) in the catalytic cracking of coals 21,23‐25 . HZSM‐5 has the strongest Brønsted acid sites that promote the aromatization reaction to convert hydrocarbon materials to BTX 26‐28 . Chareonpanich et al examined the catalytic pyrolysis of Millmerran coal using metal‐loaded zeolite catalysts 29 .…”

Section: Introductionmentioning

confidence: 99%

“…21,[23][24][25] HZSM-5 has the strongest Brønsted acid sites that promote the aromatization reaction to convert hydrocarbon materials to BTX. [26][27][28] Chareonpanich et al examined the catalytic pyrolysis of Millmerran coal using metal-loaded zeolite catalysts. 29 The USY zeolite catalyst demonstrated remarkable catalytic activity, such as hydrogenation and cracking, which led to the highest level of BTX production (14 wt%) compared to that obtained by other metal oxide catalysts.…”

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confidence: 99%

Ex‐situ catalytic fast pyrolysis of low‐rank coal over HZSM ‐5 and modified Mg/ HZSM ‐5 catalysts

Amin

Ahmed

et al. 2021

Intl J of Energy Research

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Summary Catalytic effects in fast pyrolysis of low‐rank coal and coal tar conversion were investigated in a two‐stage fixed‐bed reactor over HZSM‐5 zeolite and Mg/HZSM‐5. Mg/HZSM‐5 caused the lower total tar yield and the higher non‐condensable gas yield but the fraction of light tar (boiling point below 360°C) increased to allow a slightly higher total yield of light tar. It also exhibited good catalytic activity and increased the species of light tar than HZSM‐5 zeolite. The light tar fraction was increased from 45 to 74.6 wt% than without catalyst (66%) at the pyrolysis temperature of 600°C. Ex‐situ catalytic fast pyrolysis over Mg/HZSM‐5 also lowered the contents of element N and S in the resulting coal tars by 29% and 15% respectively. The corresponding increase in the content of element H and molar ratio of H to C of the resulting coal tars was reported as 17% and 13% respectively. The addition of Mg into HZSM‐5 increased the ability of the catalyst for inhibiting coke deposition.

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“…Therefore, immobilizing Ga cations by using the conventional impregnation method frequently yields poorly dispersed Ga 2 O 3 on the exterior surface of ZSM-5. Strategies such as isomorphous substitution of Al by Ga in the ZSM-5 framework, − subsequent reduction and oxidation after impregnation, − chemical vapor deposition, , and hierarchicalization of ZSM-5 followed by impregnation , have been developed to overcome the transport limitation of Ga precursors in synthesizing highly dispersed, extraframework Ga species in ZSM-5.…”

Section: Introductionmentioning

confidence: 99%

Gallium-Immobilized Carbon Nanotubes as Solid Templates for the Synthesis of Hierarchical Ga/ZSM-5 in Methanol Aromatization

Chen

Chang

Lee

et al. 2019

Ind. Eng. Chem. Res.

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Hierarchical Ga/ZSM-5 was synthesized by using a combinative method of steam-assisted crystallization (SAC) and hard templating. Ga-immobilized carbon nanotubes (GaCNTs) were used as hard templates. Compared with Ga-doped ZSM-5 catalysts made by impregnation and by sequential CNT templating and impregnation, hierarchical Ga/ZSM-5 had a moderate mesoporosity and possibly a high concentration of (GaO) + -Brønsted acid site. The moderate mesoporosity shortens residence times of products in the ZSM-5 matrix, while the high concentration of (GaO) + -Brønsted acid enhances aromatization activity. These advantages are critical to improve catalytic performance and durability of hierarchical Ga/ZSM-5 in methanol aromatization.

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Simplified Kinetic Modeling of Propane Aromatization over Ga-ZSM-5 Zeolites: Comparison with Experimental Data

Cited by 15 publications

References 53 publications

Highly selective and stable Zn–Fe/ZSM-5 catalyst for aromatization of propane

Highly selective and stable Zn–Fe/ZSM-5 catalyst for aromatization of propane

Ex‐situ catalytic fast pyrolysis of low‐rank coal over HZSM ‐5 and modified Mg/ HZSM ‐5 catalysts

Gallium-Immobilized Carbon Nanotubes as Solid Templates for the Synthesis of Hierarchical Ga/ZSM-5 in Methanol Aromatization

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