Kinetics of toluene alkylation with methanol catalyzed by pure and hybridized HZSM-5 catalysts

Wahab Alabi, Luqman Atanda, Rabindran Jermy, Sulaiman Al-Khattaf

Research output: Contribution to journalArticlepeer-review

58 Scopus citations

Abstract

A kinetic study of toluene alkylation with methanol was performed over pure HZSM-5, mordenite/ZSM-5 (hybrid of mordenite and HZSM-5), and ZM13 (composite mixture of HZSM-5 and MCM-41 at pH 13). Experimental runs were conducted using a batch fluidized bed reactor at temperatures of 300, 350 and 400 °C and reaction times of 3, 5, 7, 10, 13, 15 and 20. s. The rate of toluene methylation and toluene disproportionation were studied on the three catalysts (toluene alkylation is usually accompanied by toluene disproportionation on acid catalyst). Based on the results obtained, a simplified power law kinetic model consisting of three reactions was developed to estimate the activation energies of toluene methylation and disproportionation simultaneously. Coke formation on catalysts was accounted for using both reaction time and reactant conversion decay functions. All parameters were estimated based on quasi-steady state approximation. Estimated kinetic parameters were in good agreement with experimental results. The order of alkylation ability of the catalysts was found to be ZM13 > HZSM-5 > mordenite/ZSM-5, while the reverse is for toluene disproportionation (mordenite/ZSM-5 > HZSM-5 > ZM13). Thus, alkylation of toluene is most favorable on ZM13 due to combined effect of mesoporosity induced through its synthetic route and acid content. Toluene/MeOH molar ratio of 1:1 was most suitable for toluene alkylation reaction. © 2012 Elsevier B.V.
Original languageEnglish (US)
Pages (from-to)276-288
Number of pages13
JournalChemical Engineering Journal
Volume195-196
DOIs
StatePublished - Jul 2012
Externally publishedYes

Fingerprint Dive into the research topics of 'Kinetics of toluene alkylation with methanol catalyzed by pure and hybridized HZSM-5 catalysts'. Together they form a unique fingerprint.

Cite this