Study of the transalkylation of aromatic hydrocarbons over SAPO-5 catalysts

Hulea, Vasile; Bilba, Nicolae; Lupascu, Mihai; Dumitriu, Emil; Nibou, Djamel; Lebaili, S.; Kessler, H.

doi:10.1016/s0927-6513(96)00059-4

Cited by 19 publications

(4 citation statements)

References 10 publications

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“…11B and C, respectively. Nevertheless, we reported earlier that these two reactions effectively occur on SAPO-5 catalysts having acidic sites of rather medium acidic strength [30]. Indeed, as observed from Fig.…”

Section: Effect Of Reaction Temperaturementioning

confidence: 49%

“…On the other hand, transalkylation of toluene with TMB was chosen as test reaction to probe the catalytic behaviour of UL-ZSM-5 and to allow comparison between these catalysts and the reference samples. It must be noted that only molecular sieves which allow the diffusion of bulky trimethylbenzenes through their large pores, such as mordenite [20], Y [20][21][22][23][24], beta [20,[25][26][27], omega [20], SAPO [30,31] and MeAPO-5 and MeAPSO-5 [32], display high activity in this reaction, while for ZSM-5, the transformation of TMB occurs on the external surface only and consequently the catalytic activity is low [25][26][27][28][29]. Therefore, the transalkylation of toluene with TMB represents a suitable test reaction to probe the potential benefit of the large mesopores of UL-ZSM-5 to process bulky molecules.…”

Section: Introductionmentioning

confidence: 99%

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An investigation of the acid properties of UL-ZSM-5 by FTIR of adsorbed 2,6-ditertbutylpyridine and aromatic transalkylation test reaction

Ungureanu

Hoang

et al. 2005

Applied Catalysis A: General

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Section: Effect Of Reaction Temperaturementioning

confidence: 49%

Section: Introductionmentioning

confidence: 99%

An investigation of the acid properties of UL-ZSM-5 by FTIR of adsorbed 2,6-ditertbutylpyridine and aromatic transalkylation test reaction

Ungureanu

Hoang

et al. 2005

Applied Catalysis A: General

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“…6 A number of commercial transalkylation processes have been developed such as the Xylene-Plus process developed by ARCO-IFP, 7 the Tatoray process developed by UOP, 8 and the TransPlus process developed by Mobil-CPC 9 with key operating parameters listed in Table 1. Research on transalkylation has been carried out using various types of zeolites, including both medium pore zeolites, such as ZSM-5, 10 NU-87, 11 and MCM-22, 12 and large pore zeolites, such as zeolite Y, 13 Beta, 14 mordenite, 15 SAPO-5, 16 and ZSM-12. 17 This research demonstrated that zeolite based catalysts have unique properties promoting their use in aromatic transformations.…”

Section: Introductionmentioning

confidence: 99%

Transalkylation of Toluene with 1,2,4-Trimethylbenzene over Large Pore Zeolites

Almulla

Zholobenko

Hill³

et al. 2017

Ind. Eng. Chem. Res.

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Using industrially relevant operating parameters, the transalkylation of 1,2,4-Trimethylbenzene (TMB) with toluene was studied. The effect of acidity and structure, increased reaction pressure and very low levels of Pt impregnation have been investigated over both H-form and Pt-loaded zeolites: Beta, MOR, and Y. A fixed bed reactor was used at WHSV of 5 h-1 , 400 o C and a 50:50 wt. % Toluene:TMB ratio with the order of activity after 50 h TOS of Y > Beta >> MOR at 1 bar. At elevated pressure (10 bar), all catalysts showed better performance with significant improvement in MOR as pore blockage reduced and the order of activity was Beta > MOR > Y. Incorporation of Pt (0.08wt. %) further improved the activity of all catalysts with the highest conversion after 50 h TOS over Beta (62 wt. %) where Beta and MOR yielded similar levels of xylenes (40 wt. %). All catalysts were further optimized for activity whilst maintaining the desired stability and highest xylenes yield.

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“…Nonetheless, the reaction of toluene with TMB is somewhat complicated and involves in many elementary reactions. [11][12][13] Besides the primary transalkylation reaction of toluene with TMB, the isomerization, disproportionation and dealkylation also take place in the meantime. This requires development of a highly active and selective catalyst.…”

Section: Introductionmentioning

confidence: 99%

Effect of zeolite pore structure on the diffusion and catalytic behaviors in the transalkylation of toluene with 1,2,4-trimethylbenzene

Wang

Dong

et al. 2015

RSC Adv.

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Effects of pore structures of ZSM-5, MOR, Beta and USY on their catalytic properties in the transalkylation of toluene with 1,2,4-trimethylbenzene (1,2,4-TMB) were investigated by studying the catalytic mechanism and the diffusion behavior of reactants and products. The medium-pore ZSM-5 shows low catalytic activity as a result of slow decomposition of diphenylmethane (DPM) intermediates and occurrence of severe cracking of 1,2,4-TMB via the monomolecular reaction pathway. In contrast, the large-pore MOR, Beta and USY zeolites allow rapid formation and transformation of bulky DPM species, consequently exhibiting higher catalytic activity. The diffusion experiments show that 1,2,4-TMB and 1,2,4,5-tetramethylbezene (1,2,4,5-TeMB) more easily diffuse into/out of the pores of MOR zeolite than of Beta and USY. Thus, the disproportionation of 1,2,4-TMB and coking were inhibited in MOR, which makes it exhibit higher catalytic stability and xylene selectivity. A detailed analysis of the deposited coke species with GC-MS indicates that the transalkylation of toluene with 1,2,4-TMB occurs via the bimolecular intermediate mechanism.

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Study of the transalkylation of aromatic hydrocarbons over SAPO-5 catalysts

Cited by 19 publications

References 10 publications

An investigation of the acid properties of UL-ZSM-5 by FTIR of adsorbed 2,6-ditertbutylpyridine and aromatic transalkylation test reaction

An investigation of the acid properties of UL-ZSM-5 by FTIR of adsorbed 2,6-ditertbutylpyridine and aromatic transalkylation test reaction

Transalkylation of Toluene with 1,2,4-Trimethylbenzene over Large Pore Zeolites

Effect of zeolite pore structure on the diffusion and catalytic behaviors in the transalkylation of toluene with 1,2,4-trimethylbenzene

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