Kinetics Study of the Esterification Reaction of Cyclohexene to Cyclohexyl Acetate Catalyzed by Novel Bronsted-Lewis Acids Bifunctionalized Heteropolyacid Based Ionic Liquids Hybrid Solid Acid Catalysts

A series of Bronsted-Lewis acids bifunctionalized heteropolyacid based ionic liquids hybrid solid acid catalysts (BLA-HPA-ILs) were synthesized by combining the Bronsted acidic ionic liquid [Bis-Bs-BDMAEE]HPW12O40 with metallic oxide in different composition ratios and applied in the esterification of cyclohexene to cyclohexyl acetate. Among the synthesized catalysts, the (1)/Cu-2[Bis-Bs-BDMAEE]HPW12O40 catalyst with Bronsted and Lewis acidities shown the most excellent catalytic performance for the esterification of cyclohexene with acetic acid. The BLA-HPA-ILs catalysts were characterized by elemental analysis, FT-IR, Py-IR, TG, H-1 NMR, SEM and EDX. The effects of reaction temperature, catalyst dosage, and initial reactant molar ratio has been investigated in detail. A pseudohomogeneous (PH) kinetic model was used to correlate the kinetic data in the temperature range of 333.15-363.15 K, and the kinetic parameters were estimated, indicating the results calculated by the kinetic model are well coincidence with the experimental results. Moreover, as a heterogeneous reaction catalyst, (1)/Cu-2[Bis-Bs-BDMAEE]HPW12O40 could be easily recovered by a simple treatment and reused six times without any obvious decrease in catalytic activity, displaying good reusability. [GRAPHICS] .

Automated summary

A series of bifunctionalized solid acid catalysts were synthesized and applied in the esterification of cyclohexene, among which the (1)/Cu-2[Bis-Bs-BDMAEE]HPW12O40 catalyst showed the best catalytic performance and good reusability. Kinetic studies revealed a pseudohomogeneous model could accurately predict the reaction kinetics in the temperature range tested.