Tert-butylation of Toluene with Tert-butyl Alcohol over Realuminated H-mordenite Zeolite

Abstract

Abstract: The realuminated H-mordenite catalysts(HM1-4) treated with different concentrations of NaOH and NaAlO₂ aqueous solutions were prepared,and characterized by inductively coupled plasma(ICP),X-ray diffraction(XRD),Fourier transform-infrared spectroscopy(FT-IR) and temperature-programmed desorption of ammonia,They are of lower Si/Al ratio and higher acid amount while keeping a high relative crystallinity.Their catalytic per-formances were evaluated with the liquid-phase tert-butylation of toluene with tert-butyl alcohol in a 100 ml stainless steel batch reactor equipped with a stirrer.HM₂ zeolite catalyst,obtained by treating HM in 0.1 mol·L^-1 NaOH followed by 0.05 mol·L^-1 NaAlO₂ aqueous solution,shows a higher catalytic activity because of its highest acid amount.For HM₂ catalyst the influences of reaction conditions on catalytic performance were investigated.The conversion of toluene is 50.3% and the selectivity of p-tert-butyltoluene is 74.7% at a temperature of 180℃,2 of molar ratio of tert-butyl alcohol to toluene,4h of reaction time and 0.2 of M(catalyst)/M(toluene).

Key words: realuminated H-mordenite, toluene, tert-butyl alcohol, p-tert-butyltoluene

摘要： The realuminated H-mordenite catalysts(HM1-4) treated with different concentrations of NaOH and NaAlO₂ aqueous solutions were prepared,and characterized by inductively coupled plasma(ICP),X-ray diffraction(XRD),Fourier transform-infrared spectroscopy(FT-IR) and temperature-programmed desorption of ammonia,They are of lower Si/Al ratio and higher acid amount while keeping a high relative crystallinity.Their catalytic per-formances were evaluated with the liquid-phase tert-butylation of toluene with tert-butyl alcohol in a 100 ml stainless steel batch reactor equipped with a stirrer.HM₂ zeolite catalyst,obtained by treating HM in 0.1 mol·L^-1 NaOH followed by 0.05 mol·L^-1 NaAlO₂ aqueous solution,shows a higher catalytic activity because of its highest acid amount.For HM₂ catalyst the influences of reaction conditions on catalytic performance were investigated.The conversion of toluene is 50.3% and the selectivity of p-tert-butyltoluene is 74.7% at a temperature of 180℃,2 of molar ratio of tert-butyl alcohol to toluene,4h of reaction time and 0.2 of M(catalyst)/M(toluene).

关键词: realuminated H-mordenite, toluene, tert-butyl alcohol, p-tert-butyltoluene

ZHOU Zhiwei, WU Wenliang, WANG Jun, ZENG Chongyu. Tert-butylation of Toluene with Tert-butyl Alcohol over Realuminated H-mordenite Zeolite[J]. , 2009, 17(2): 195-199.

周志伟, 武文良, 王军, 曾崇余. Tert-butylation of Toluene with Tert-butyl Alcohol over Realuminated H-mordenite Zeolite[J]. , 2009, 17(2): 195-199.

References

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