Effect of pore size and acidity on the coke formation during ethylbenzene conversion on zeolite catalysts

Huang, Jun; Jiang, Yijiao; Marthala, V. R. Reddy; Bressel, Arne; Frey, Joerg; Hunger, Michael

doi:10.1016/j.jcat.2009.02.019

Cited by 64 publications

(54 citation statements)

References 24 publications

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“…(4), (5) and Fig. 3, the calculated activation energy of the disproportionation of ethylbenzene is 30.16 kJ mol -1 which also agreed well with reported value (Table 5).…”

Section: Reaction Kineticssupporting

confidence: 89%

“…It has been reported that the mechanism of zeolite-catalyzed ethylbenzene disproportionation is shape selective with the diffusion difference among p-DEB, m-DEB, and ortho-diethylbenzene (o-DEB) [5]. Hence, catalyst modification techniques such as partial deactivation of external surface acid sites, narrowing of pore channels, increasing diffusion path length (crystal size), etc., have been used to enhance p-DEB selectivity during ethylbenzene disproportionation.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of N2 and O2 on selective disproportionation of xylene mixed ethylbenzene over highly active silylated HZSM-5

Nandiwale

Bokade

2013

Appl Petrochem Res

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The influence of carrier gases such as nitrogen and air (78 % N 2 and 21 % O 2 ) on catalytic activity and its stability etc., over modified H-ZSM-5 (pore size regulated by silylation) for the selective formation of Para-diethylbenzene (p-DEB) by xylene mixed ethylbenzene (EB) disproportionation is discussed. The comparison of plane and modified HZSM-5 catalysts using different carrier gases viz., nitrogen and air on pure EB and xylene mixed EB feeds are presented. The disproportionation reaction with xylene mixed EB feed in the presence of air over HZSM-5TS (8 % silica deposited) is observed to be more active and selective as far as p-DEB formation is concerned. Reaction kinetics of EB disproportionation with first-order power law model at different temperatures and W/F (weight of the catalyst/reactant feed rate), with pure EB and xylene mixed EB feed are also discussed. The reaction rate constants are within 0.0668-0.0969 dm 3 /g h and the activation energy of the reaction is calculated to be 30.16 kJ/mol. The catalyst stability (100 h) in the presence of carrier gas is also studied in detail.

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“…(4), (5) and Fig. 3, the calculated activation energy of the disproportionation of ethylbenzene is 30.16 kJ mol -1 which also agreed well with reported value (Table 5).…”

Section: Reaction Kineticssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Effect of N2 and O2 on selective disproportionation of xylene mixed ethylbenzene over highly active silylated HZSM-5

Nandiwale

Bokade

2013

Appl Petrochem Res

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“…This phenomenon may be attributed to the dealkylation of alkylbenzenes or the participation of aromatics. Huang et al [28] studied ethylbenzene conversion on zeolite catalysts such as ZSM-5 and the obtained results indicate that strong Brønsted acid sites are in favor of the dealkylation of ethlybenzene. Sassi et al [21] investigated the reactions of methylbenzene on HBeta catalysts, and supported the hydrocarbon pool mechanism for MTO chemistry with side-chain methylation as the predominant route to olefins and the paring reaction as a possible minor pathway.…”

Section: Discussionmentioning

confidence: 99%

Effects of Aromatics on the Stability and Product Distribution of the Methanol to Olefin Process

et al. 2011

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Methanol to olefin process was investigated over a steam-treated Ca-ZSM-5 catalyst in a flow-type fixed bed reactor by adding aromatics to the methanol feed. As a comparison, the catalytic performance in the presence of nitrogen and water was also investigated. The experimental results exhibit that in the presence of aromatics, the total light olefin selectivity and the ethylene selectivity increased, while propylene selectivity increased with adding o-xylene and m-xylene to the methanol feed, but decreased with adding benzene, toluene, p-xylene and ethylbenzen to the methanol feed. The catalyst was characterized by temperature-programmed desorption of ammonia, N 2 adsorption, and scanning electron microscope. The adsorption of water and aromatics on the catalyst was also studied. Based on the results, it is concluded that aromatics may be responsible for the formation of light olefins and be more favorable for ethylene than propylene in methanol conversion.

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“…Detailed mechanistic study by Huang et al [24,25] using solid state 13 C NMR evidenced that zeolite acidity and pore size strongly Nomenclature C i concentration of specie i in the riser simulator (mol/m 3 ) CL confidence limit E i apparent activation energy of ith reaction (kJ/mol) [E 1 is the activation energy for 1,3,5-TEB cracking reaction; E 2 is the activation energy for 1,3,5-TEB isomerization reaction; E3 is the activation energy for DEB cracking reaction] k i apparent kinetic rate constant (m 3 /kgcat s) [k 1 is the rate constant for 1,3,5-TEB cracking reaction; k 2 is the rate constant for 1,3,5-TEB isomerization reaction; k 3 is the rate constant for DEB cracking Greek letter apparent deactivation constant (s −1 ) (TOS model) affect their catalytic behavior in EB disproportionation. It was observed that EB disproportionation occurred at low reaction temperatures over large-pore zeolite H-Y in contrast to medium-pore ZSM-5 zeolites.…”

Section: Introductionmentioning

confidence: 99%

Transalkylation of ethyl benzene with triethylbenzene over ZSM-5 zeolite catalyst

Akhtar

Tukur

Al-Yassir

et al. 2010

Chemical Engineering Journal

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Effect of pore size and acidity on the coke formation during ethylbenzene conversion on zeolite catalysts

Cited by 64 publications

References 24 publications

Effect of N2 and O2 on selective disproportionation of xylene mixed ethylbenzene over highly active silylated HZSM-5

Effect of N2 and O2 on selective disproportionation of xylene mixed ethylbenzene over highly active silylated HZSM-5

Effects of Aromatics on the Stability and Product Distribution of the Methanol to Olefin Process

Transalkylation of ethyl benzene with triethylbenzene over ZSM-5 zeolite catalyst

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