Hydroisomerization of ethylbenzene over bimetallic bifunctional zeolite catalysts

Hierarchical zeolite ZSM-5 synthesized by applying amphiphilic organosilane as mesopore template, nanosized zeolite Beta and zeolite MCM-22 have been studied, for the first time in the conversion of mixed ethylbenzene-m-xylene feed. The effects of the channel structure, nanosizing and presence of mesopores in these zeolite materials with close Si/Al molar ratio on the catalytic activity and selectivity have been discussed. It was found that the diverse zeolites have different advantages and disadvantages in dependence on their structure and morphology. MCM-22 zeolite provides promising ethylbenzene conversion at low xylene loss with high production of the p-isomer among xylene.

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Alkaline earth metal ion-exchanged β zeolite supported Pt catalysts for hydroisomerization of n-heptane

Liu

Zhang

Yao

et al. 2010

Reac Kinet Mech Cat

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Alkaline earth metal (Mg, Ca, Sr and Ba) ions were exchanged into Hb zeolite, which were used as the supports to load the noble metal Pt to prepare bifunctional catalysts for hydroisomerization of n-heptane. The catalysts were characterized by ICP, XRD, BET, NH 3 -TPD, H 2 -TPR and H 2 -chemisorption techniques, and evaluated in an atmospheric fixed bed reactor. The catalysts promoted by the alkaline earth metals are revealed to present much higher selectivity to isomerization than the counterpart Pt/Hb. Moreover, the Ba-bearing catalyst loaded with 0.4 wt% Pt and 5:1 molar ratio of Ba to Pt gives a very high selectivity to iso-heptanes 95.4% with a considerable high conversion of n-heptane 61.7%. The promotion effect of alkaline earth metals is briefly discussed in relation to characterization data.Keywords Hydroisomerization of paraffin Á b zeolite Á Alkaline earth metal Á Bifunctional catalyst Á Pt

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Hydroisomerization of ethylbenzene over bimetallic bifunctional zeolite catalysts

Cited by 15 publications

References 20 publications

Influence of the Addition of a Second Metal on the Catalytic Performance of Pt-Beta Agglomerated Catalyst in the Hydroisomerization of n-Octane

Influence of the Addition of a Second Metal on the Catalytic Performance of Pt-Beta Agglomerated Catalyst in the Hydroisomerization of n-Octane

Transformation of ethylbenzene–m-xylene mixture on zeolites with different structures

Alkaline earth metal ion-exchanged β zeolite supported Pt catalysts for hydroisomerization of n-heptane

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