Effect of γ-alumina as active matrix added to HZSM-5 catalyst on the aromatization of methanol

Chen, Chen; Ji, Hongqiang; Zhang, Qiang; Li, Chunyi; Shan, Honghong

doi:10.1007/s13203-015-0139-5

Cited by 5 publications

(5 citation statements)

References 30 publications

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“…It was generally observed that the Bronsted acidity decreased as metal loading increased on parent ZSM-5. This was due to replacement of Bronsted sites by the added metals on the surface of the catalyst having a significant effect on activity test for propane aromatization [25,26].…”

Section: Resultsmentioning

confidence: 99%

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: Resultsmentioning

confidence: 99%

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

et al. 2020

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“…Inoue et al 51 reported that Ag doping improved the alkenes' dehydrogenation of zeolite catalysts and more alkenes and bio-aromatics are produced. Chen et al 52 prepared the γ-alumina modification HZSM-5 catalysts to obtain the high yield of bio-aromatics, in which the modification of γ-alumina can increase the Lewis acid site concentration, acid strength, and pore size of the HZSM-5 catalyst. It is worth noting that the coking of the zeolite catalysts should be resolved during the BMTA process.…”

Section: Synthesis Routes Of Bio-aromaticsmentioning

confidence: 99%

State of the Art and Perspectives in Catalytic Conversion Mechanism of Biomass to Bio-aromatics

Yan

2020

Energy Fuels

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Research on biomass decomposition and transformation has attracted widespread attention from academia to industry worldwide, aiming to harvest bio-aromatics from the abundant renewable biomass resource. However, the complexity of the structure and composition of biomass makes its conversion into bio-aromatics a very challenging task. Hence, it is necessary to understand in depth the mechanism of biomass conversion to bio-aromatics with higher selectivity. Although considerable progress has been achieved on the development of bio-aromatics from biomass, the detailed process and reaction mechanism for the bioaromatics synthesis has lacked a complete summary. This work reviews the recent advances in the conversion of biomass to bioaromatics, including biomass gasification, pyrolysis, and hydrolytic fermentation, etc. Various biomass sources and biomass-derived model compounds as examples were used to illustrate the effect of different raw materials on the yield of bio-aromatics. Subsequently, this review summarizes the influence of different catalysts on the synthesis of bio-aromatics and the metal-modified HZSM-5 catalysts exhibited a higher bio-aromatics yield compared with those of other catalysts. Finally, the reaction mechanism of biomass to bio-aromatic hydrocarbons via different reaction routes was discussed in detail. The aim is for the conversion mechanism presented in this work to provide a reference for the efficient conversion of bio-aromatics from biomass in the future.

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“…However, an increased aromatisation degree produces more heavy products and, therefore, deactivation of the catalyst occurs by coking . Chen and co‐workers achieved an increase in both concentration of Lewis acid sites, acid strength and pore size by simply mixing γ‐alumina with ZSM‐5, which promoted the production of aromatics.…”

Section: Methanol To Aromaticsmentioning

confidence: 99%

“…[15c] However, an increased aromatisation degree produces more heavy products and, therefore, deactivation of the catalyst occurs by coking. [15e] Chen and co-workers [18] achieved an increasei nb oth concentration of Lewis acid sites, acid strength and pore size by simply mixing g-alumina with ZSM-5, which promoted the production of aromatics. All of the above-mentioned research reported high yields of p-xylene among the aromaticf raction;h owever,several studies concentrated specifically on this targetm olecule.…”

Section: Methanol To Aromaticsmentioning

confidence: 99%

Biomass‐Derived Renewable Aromatics: Selective Routes and Outlook for p‐Xylene Commercialisation

2016

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Methylbenzenes are among the most important organic chemicals today and, among them, p-xylene deserves particular attention because of its production volume and its application in the manufacture of polyethylene terephthalate (PET). There is great interest in producing this commodity chemical more sustainably from biomass sources, particularly driven by manufacturers willing to produce more sustainable synthetic fibres and PET bottles for beverages. A renewable source for p-xylene would allow achieving this goal with minimal disruption to existing processes for PET production. Despite the fact that recently some routes to renewable p-xylene have been identified, there is no clear consensus on their feasibility or implications. We have critically reviewed the current state-of-the-art with focus on catalytic routes and possible outlook for commercialisation. Pathways to obtain p-xylene from a biomass-derived route include methanol-to-aromatics (MTA), ethanol dehydration, ethylene dimerization, furan cycloaddition or catalytic fast pyrolysis and hydrotreating of lignin. Some of the processes identified suggest near-future possibilities, but also more speculative or longer-term sources for synthesis of p-xylene are highlighted.

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Effect of γ-alumina as active matrix added to HZSM-5 catalyst on the aromatization of methanol

Cited by 5 publications

References 30 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

State of the Art and Perspectives in Catalytic Conversion Mechanism of Biomass to Bio-aromatics

Biomass‐Derived Renewable Aromatics: Selective Routes and Outlook for p‐Xylene Commercialisation

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