Alkylation of Phenol with tert-Butanol Catalyzed by Mesoporous Material with Enhanced Acidity Synthesized from Zeolite MCM-22

摘要

Using zeolite MCM-22 as source and cetyltri-methylammonium bromide(CTAB)as template,mesoporous material denoted as M-MCM-22 with enhanced acidity has been synthesized and characterized by XPD,FT-IR,N2 adsorption-desorption,~(27)Al-MAS NMR,IR spectra of pyridine adsorption,and NH3-TPD techniques,etc.The catalytic performance of M-MCM-22 was tested in alkylation of phenol with tert-butanol,indicating that M-MCM-22 showed highly and steadily catalytic properties.The highest conversion of phenol could be achieved at 418 K,while the highest selectivity to 2,4-di-TBP was obtained at 398 K.It is found that high temperature is advantageous to form 4-TBP,whereas low weight hourly space velocity(WHSV/h~(-1))is helpful for both conversion of phenol and selectivity to 2,4-DTBP.It is also shown that high ratio of tert-butanol/phenol is beneficial for obtaining high conversion of phenol and selectivity to 2,4-di-TBP.