Mechanism study of aromatics production from furans with methanol over zeolite catalysts

Wang, Chenguang; Si, Zhan; Wu, Xiaoping; Lv, Wei; Bi, Ke; Zhang, Xinghua; Chen, Lungang; Xu, Ying; Zhang, Qi; Ma, Longlong

doi:10.1016/j.jaap.2019.01.013

Cited by 23 publications

(26 citation statements)

References 21 publications

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“…The total yield increased with increasing temperature and reached 95.2% at 550 °C. The yield of aromatics went through a maximum at 500 °C, which could reflect the overall effects of temperature on a complex series of reactions, including the catalytic cracking of MF, the MTO reactions, the Diels–Alder reactions, the alkylation reactions, the olefin aromatization and the aromatic polymerization reactions . The yield of olefins gradually increased with increasing temperature, indicating that high temperatures enhanced the catalytic cracking of MF and methanol to gaseous small molecules.…”

Section: Resultsmentioning

confidence: 97%

“…The selectivity of xylenes increased with increasing methanol to MF ratio, accompanied by a decrease in the selectivity of benzene and toluene. On the one hand, adding methanol increased PX by producing additional PX by the Diels–Alder reactions between propylene and MF and the alkylation reactions of benzene/toluene with methanol . On the other hand, excessive content of methanol formed a large amount of light olefins, leading to a decrease in the PX yield (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…naphthalenes and indenes) owing to increasing (H/C) eff ratio in the feeds. Several previous works have reported on the co‐feeding of furans with methanol over unmodified HZSM‐5 catalysts . All of these investigations reported that the yields of aromatics and olefins were improved and the coke yield was reduced when methanol was co‐fed with furans.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, the residual carbon for fresh catalyst (before reaction), measured by the amount of CO and CO 2 formed during the calcination at 600 °C, was almost negligible (undetected). The overall carbon yield ( Y j , C‐mol%) of a specific class of compounds (such as aromatics, olefins and oxygenates), the carbon yield ( Y l , C‐mol%) of a specific product, the conversion ( C conv , C‐mol%) of a specific reactant and the product selectivity ( S i , C‐mol%) were calculated based on Eqns (1)–(4) . All tests were repeated three times and the reported data are the mean values of three trials.…”

Section: Materials and Experimentsmentioning

confidence: 99%

“…found that Ga‐promoted HZSM‐5 zeolites enhanced the selectivity of light aromatics such as benzene, toluene, ethylbenzene and xylenes in the aromatization of DMF and ethylene. Wang et al . reported a maximum aromatic yield of 43.5% in the co‐catalytic conversion of MF and methanol over HZSM‐5.…”

Section: Introductionmentioning

confidence: 99%

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Selective conversion of furans to p‐xylene with surface‐modified zeolites

Zhu

Fan

Wang

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND Owing to the growing consumption of oil and the negative environmental impacts, the production of p‐xylene (PX) from renewable biomass has gained significant attention recently. However, the major challenge for the production of PX from biomass or furans is how to improve the yield and selectivity of PX, along with reducing coke. RESULTS The para selectivity in the catalytic conversion of furans was greatly enhanced owing to the deactivation of external surface and the adjustment of pore entrance. Co‐catalytic conversion of furans and methanol significantly enhanced the production of PX by the Diels–Alder reactions between furans and olefins and the alkylation of benzene/toluene with methanol. The highest PX yield of 17.8 C‐mol% with a p‐xylene/xylene ratio of 94.5% was obtained by the co‐conversion of 2‐methylfuran with methanol over the 15%La/10%Ce/HZ catalyst. CONCLUSION This work proved that furans (2‐methylfuran, 2,5‐dimethylfuran, furfural and furan) were able to be selectively converted into a high‐value chemical (PX) over the 15%La/10%Ce/HZ catalyst. The transformation mainly involved four key reactions: the catalytic cracking of furans, the Diels–Alder reactions, the alkylation of aromatics and the isomerization of xylenes over the surface‐modified zeolite. © 2019 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Materials and Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Selective conversion of furans to p‐xylene with surface‐modified zeolites

Zhu

Fan

Wang

et al. 2019

J of Chemical Tech & Biotech

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Biobased Paraxylene

Gong¹,

Rozmiarek

2023

Industrial Arene Chemistry

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Progress of the Catalytic Deactivation of H‐ZSM‐5 Zeolite in Glycerol Dehydration

et al. 2021

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Glycerol conversion into value-added chemicals has received much attention due to the prospect of increasing the biodiesel industry's profitability. The dehydration of glycerol is one of the most explored reactions in the valorization of glycerol, and the zeolite H-ZSM-5 is one of the furthermost used structures. In this study, several characterization techniques were used to investigate the detailed aging of coke in spent H-ZSM-5 zeolites after their use in the gas-phase glycerol dehydration to produce acrolein. The carbonaceous deposits formed almost totally in the first minutes of the reaction. They rapidly got trapped inside the pores, hampering the accessibility to active sites and the zeolite's full catalytic action. Two types of coke were formed during the reaction: polyglycols, on the external surface, and aromatics, inside the pores, representing the majority (~98 wt.%) of the carbonaceous compounds. Besides, aromatic compounds age over time, becoming bulkier and more deficient in hydrogen. We also found a correlation between the amount of coke, its size, accessibility to the acid active sites, and changes in crystallographic parameters of the zeolite with the presence of coke.

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Mechanism study of aromatics production from furans with methanol over zeolite catalysts

Cited by 23 publications

References 21 publications

Selective conversion of furans to p‐xylene with surface‐modified zeolites

Selective conversion of furans to p‐xylene with surface‐modified zeolites

Biobased Paraxylene

Progress of the Catalytic Deactivation of H‐ZSM‐5 Zeolite in Glycerol Dehydration

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