Enhancing p-xylene productivity for disproportionation of toluene in microstructured reactors

Mitra, Brishti; Kunzru, Deepak

doi:10.1016/j.cep.2012.10.016

Cited by 10 publications

(5 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…p ‐Xylene (PX) is one of the most valuable aromatic chemicals, mainly used for the production of terephthalic acid and polyethylene terephthalate . Industrially, PX is mostly obtained from the refining of petroleum‐derived gasoline followed by a separation process, though disproportionation and isomerization technologies have also been employed for its production . Owing to the growing consumption of oil and the negative environmental impacts, the production of PX from renewable biomass resources has gained significant attention recently …”

Section: Introductionmentioning

confidence: 99%

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

Zhu

Fan

Wang

et al. 2019

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

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

show abstract

Section: Introductionmentioning

confidence: 99%

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

Zhu

Fan

Wang

et al. 2019

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

show abstract

“…To maximize the p-xylene yield, isomerization and disproportionation technologies are employed for BTX conversion. [11][12][13] The p-xylene is further oxidized and purified to obtain PTA for polymerization. [14][15][16] The prevailing ethylene and p-xylene are derived from non-renewable fossilbased feedstocks, i.e., oil, coal and natural gas.…”

Section: Introduction and Scope Of Reviewmentioning

confidence: 99%

Synthesis of ethylene glycol and terephthalic acid from biomass for producing PET

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Despite the fact that the active species for this reaction has been generally considered to be Brønsted acid site [ 8 ], a synergy effect of Brønsted acid sites and Lewis acid sites cannot be ruled out [ 9 ]. Moreover, the addition of La 2 O 3 led to a decrease in the acidity of ZSM-5 [ 10 ] and also of the activity, but the reaction took place with an enhancement in the p-xylene yield. A similar behavior has been reported for the core/shell-structured borosilicate, M -t W enty-t W o (MWW)-type zeolites [ 1 ], where the presence of boron induced the creation of active sites required for such reactions.…”

Section: Introductionmentioning

confidence: 99%

Behavior of Molybdenum–Vanadium Mixed Oxides in Selective Oxidation and Disproportionation of Toluene

et al. 2019

View full text Add to dashboard Cite

This study deals with the behavior of molybdenum–vanadium (Mo/V) mixed oxides catalysts in both disproportionation and selective oxidation of toluene. Samples containing different Mo/V ratios were prepared by a modified method using tetradecyltrimethylammonium bromide and acetic acid. The catalysts were characterized using several techniques: nitrogen adsorption–desorption isotherms, X-Ray diffraction (XRD), ammonia temperature-programmed desorption (TPD-NH3), temperature-programmed reduction by hydrogen (H2-TPR), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, Fourier-transform infrared-spectroscopy (FTIR) and ultraviolet-visible spectroscopies (UV–VIS). The XRD results evidenced the presence of orthorhombic α-MoO3 and V2O5 phases, as well as monoclinic β-MoO3 and V2MoO8 phases, their abundance depending on the Mo to V ratio, while the TPD-NH3 emphasized that, the total amount of the acid sites diminished with the increase of the Mo loading. The TPR investigations indicated that the samples with higher Mo/V ratio possess a higher reducibility. The main findings of this study led to the conclusion that the presence of strong acid sites afforded a high conversion in toluene disproportionation (Mo/V = 1), while a higher reducibility is a prerequisite to accomplishing high conversion in toluene oxidation (Mo/V = 2). The catalyst with Mo/V = 1 acquires the best yield to xylenes from the toluene disproportionation reaction, while the catalyst with Mo/V = 0.33 presents the highest yield to benzaldehyde.

show abstract

Enhancing p-xylene productivity for disproportionation of toluene in microstructured reactors

Cited by 10 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

Synthesis of ethylene glycol and terephthalic acid from biomass for producing PET

Behavior of Molybdenum–Vanadium Mixed Oxides in Selective Oxidation and Disproportionation of Toluene

Contact Info

Product

Resources

About